How to use your mac’s disk utility to partition wipe repair restore and copy drives

You can access the contents of a disk image the same way that you access other volumes and external hard drives on macOS. Double-click on the disk image file to mount its filesystem, then navigate the filesystem in the Finder to access individual files and folders. If you have the permission to access the files that you would like to restore, simply drag those items to the volume that you would like to restore them to.

Restoring individual items or an entire disk image to another hard drive using CCC

To restore files or an entire filesystem from a disk image:

  1. Launch CCC
  2. Select Restore from disk image. from the Source selector and locate your backup disk image. CCC will mount the disk image for you.
  3. Choose a volume from the Destination selector. You may not choose the current startup disk as a destination, however you may choose to restore to a folder on the current startup disk.
  4. If you do not want to restore everything, choose Some files. from the Clone menu (below the Source selector) and deselect any item that you do not wish to restore.
  5. Click the Clone button.

Restoring system files to your startup disk

If you want to restore system files to your startup disk, you must start up your Macintosh from an installation of macOS on another hard drive, such as a bootable backup created by CCC. Once you have booted your Mac from another volume, follow the steps from the previous section.

Restoring system files to your startup disk when you don’t have a bootable backup

If you do not have an installation of macOS on another hard drive, you can boot your Mac from your macOS Recovery volume and use Disk Utility to restore the entire disk image:

High Sierra and Mojave

Note: The destination volume format must match the format of the disk image that you’re restoring from. This limitation is specific to Disk Utility – if you’re restoring from a disk image using CCC, CCC can restore an APFS disk image to an HFS+ volume, and you can restore an HFS+ disk image to an APFS volume. Use Disk Utility as a last resort.

  1. Hold down Command+R while you restart your computer.
  2. Choose Disk Utility in the Utilities application.
  3. Choose Show All Devices from the View menu.
  4. Click on the device you want to restore to in the sidebar (see this article for specific formatting instructions).
  5. Click the Erase button in the toolbar and proceed to erase the device using the GUID Partition Map partitioning scheme, and the format that matches your source disk image.
  6. Reselect the volume that you would like to restore to. If you are restoring to an APFS volume, choose the parent APFS container.
  7. Choose Open Disk Image. from the File menu and select the disk image file that you would like to restore from.
  8. Choose Restore. from the Edit menu.
  9. Select the mounted disk image volume that you would like to restore. If you are restoring to an APFS volume, choose the container that is the parent of the disk image volume you are trying to restore.
  10. Click the Restore button.

El Capitan and Sierra

  1. Hold down Command+R while you restart your computer
  2. Choose Disk Utility in the Utilities application
  3. Click on the volume you want to restore to in the sidebar
  4. Choose Restore. from the Edit menu
  5. Click on the Image. button and locate the disk image that you would like to restore
  6. Click the Restore button


  1. Hold down Command+R while you restart your computer
  2. Choose “Disk Utility” in the Utilities application
  3. From the File menu, choose Open Disk Image. and locate the disk image that you would like to restore
  4. In the list in the pane on the left, click on the mounted disk image’s volume
  5. Click on the Restore tab on the right side of the window
  6. Drag the mounted disk image to the Source field. If the Source field does not accept the dragged volume, right-click on the disk image’s mounted volume and choose Set as source from the contextual menu.
  7. Drag the hard drive that you would like to restore to into the Destination field
  8. Check the box to erase the destination (if present), then click on the Restore button.
  9. Restart your Mac from your newly restored volume, then use CCC to restore the Recovery HD volume from the archive on your startup disk.

Using Migration Assistant to migrate data from a disk image

If you have a clean installation of macOS and simply want to restore your user data from a full-system backup on a disk image, you can use Migration Assistant for this task. Simply mount the disk image, then open Migration Assistant and proceed as directed, using the mounted disk image as the source. Note that Migration Assistant will only accept a disk image that has a full system backup, it will not accept a disk image that has only user data.

Migration Assistant and the CCC SafetyNet

If your backup volume has a “_CCC SafetyNet” folder, you can move that folder to the Trash before using Migration Assistant to avoid copying that folder during a migration. This is particularly important if that folder has a lot of data in it and you’re migrating to a disk that is smaller than the backup volume. If you would like to retain the SafetyNet folder on the backup volume, don’t empty the Trash. After Migration Assistant has completed, then you can move the SafetyNet folder back to the root of the backup volume.

Migration Assistant and Yosemite, El Capitan

On Yosemite and El Capitan, Migration Assistant will ask that you close all applications, and it will then log you out before presenting migration options. This poses a problem for migrating data from a disk image because the disk image will be unmounted when you are logged out, and Migration Assistant doesn’t offer any interface to choose a disk image. To work around this problem, you can use our Mount disk image for Migration Assistant application. Simply drag the disk image containing your full system backup onto the application and it will guide you through a fairly simple procedure that will make the disk image available to Migration Assistant after a short delay.

Internet Recovery has a number of useful applications. This guide will show you how to use Internet Recovery to install a fresh copy of macOS to a blank or corrupted SSD.

Internet Recovery is only available on Apple computers made after 2009. If your computer was released in 2010 or 2011, you may need to update to the latest version of macOS to enable Internet Recovery.

Шаг 1 How to Start Up a Mac in Internet Recovery Mode

Shut down the computer.

If you’re installing MacOS to a new drive with Internet Recovery, you can skip this step.

Шаг 2

Once the computer is completely shut down, press the power button, then immediately press and hold the key combination cmd + option + R.

Шаг 3

When the spinning globe animation appears, you can release the keys.

The globe will spin while Internet Recovery starts up. If you are not using a wired internet connection, a choose network prompt will appear. Use this menu to connect the computer to a WiFi network.

Шаг 4

Once a network connection has been established, a progress bar will appear underneath the spinning globe.

Шаг 5

When Internet Recovery has loaded, you will see the macOS recovery screen.

Шаг 6 How to use Internet Recovery to install macOS to a new SSD

Before you can install macOS to the new drive, you’ll need to format the drive so the installer can recognize it.

Open Disk Utility from the recovery menu, select your drive, and click the Erase button toward the top of the Disk Utility window.

Make up a name for your drive, and make sure the format is set to Mac OS Extended (Journaled) or APFS. If there is a "Scheme" option, set it to GUID Partition Map.

If you don’t see your drive listed in the Disk Utility menu, select Show All Devices from the View section of the menu bar.

Once the new drive is formatted, press Command + Q to exit Disk Utility and return to the recovery menu.

Шаг 7

Back at the recovery menu, select Install macOS .

Шаг 8

Follow the prompts to install macOS, selecting the newly formatted disk as the target for the installation.

Your computer may restart several times during the installation of macOS. Once the installation is complete, you can use Migration Assistant to transfer data from your old drive to the new one.

Your computer may restart several times during the installation of macOS. Once the installation is complete, you can use Migration Assistant to transfer data from your old drive to the new one.

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Taylor Dixon

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Perfect, it is soooooo easy

just be super careful with the pentalobe screws, easy to cam out and strip the heads

be sure driver is engaged and apply more down force then you would think before turning

Hi there, will this work when upgrading an Early 2011 Macbook Pro with a new SSD and RAM? I don’t want to keep or clone any data that I currently have on the computer. I just want to do a clean install of MacOS without transferring over any old files. Thank you!

Fiona, the Early 2011 MacBook Pros didn’t ship with internet recovery, but as long as it had a recent-ish version of MacOS before the SSD upgrade the firmware should have updated, which enables internet recovery! This is a great method for installing a fresh copy of MacOS to a new SSD.

Hello. Thank you for the article Taylor. I use a MBP 9,2 and wish to replace my ageing 500GB HDD with 500GB SSD and undergo a clean install of macOS. I’ll follow this article and install by the Internet Recovery method. I have a Time Machine backup, from which I want to restore only certain files and folders pertaining to my studies and work. I also want to restore only Keychain. Can you advise me regarding these or direct me by providing helpful links? Thank you.

Disk Utility's restore function lets you create a bootable clone

Tom Nelson is an engineer, programmer, network manager, and computer network and systems designer who has written for Other World Computing,and others. Tom is also president of Coyote Moon, Inc., a Macintosh and Windows consulting firm.

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In This Article

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Disk Utility has always been able to create clones, although the app refers to the process as Restore, as in restoring data from a source drive to a target drive. The restore function isn’t just for drives. It will work with just about any storage device that you can mount to your Mac, including disk images, hard drives, SSDs, and USB flash drives.

While it's still possible to create an exact copy (a clone) of any drive connected directly to your Mac, changes to Disk Utility have created extra steps when you use Disk Utility’s Restore function to clone your startup drive.

But don't let the idea of extra steps get in the way, the process is still pretty simple, and the added steps actually help ensure a more accurate clone of the startup drive.

Instructions in this article apply to devices running macOS 10.11 (El Capitan) and later.

How Restore Works

The Restore function in Disk Utility uses a block copy function that can speed up the copy process. It also makes an almost exact copy of the source device. What "almost exact" means is that a block copy moves everything in a data block from one device to the other. The results are almost an exact copy of the original. A file copy copies the data file by file. While the information remains the same, the location of the file on the source and destination devices will likely be different.

Using a block copy is faster, but it does have some limits that affect when it can be used, the most important being that copying block by block requires that both the source and destination devices be first unmounted from your Mac. This ensures that block data doesn't change during the copy process. Don’t worry, though; you don’t have to do the unmounting. Disk Utility’s Restore function takes care of that for you. But it does mean that neither the source nor the destination can be in use when you use the Restore capabilities.

How to Restore a Non-Startup Volume

You can’t use the Restore function on the current startup drive, or any drive that has files in use. If you need to clone your startup drive, you can make use of either your Mac’s Recovery HD volume or any drive that has a bootable copy of OS X installed.

Launch Disk Utility, located at /Applications/Utilities.

The Disk Utility app will open, displaying a single window divided into three spaces: a toolbar, a sidebar showing currently mounted drives and volumes, and an info pane, showing information about the currently selected device in the sidebar.

If the Disk Utility app looks different from this description, you may be using an older version of the Mac OS. You can find instructions cloning a drive using an earlier version of Disk Utility.

In the sidebar, select the volume to which you want to copy/clone data. The volume you select will be the destination drive for the Restore operation.

Select Restore from Disk Utility’s Edit menu.

A sheet will drop down, asking you to select from a drop-down menu the source device to use for the Restore process. The sheet will also warn you that the volume you selected as the destination will be erased, and its data will be replaced with data from the source volume.

Use the drop-down menu next to the "Restore from" text to select a source volume, and then click the Restore button.

The Restore process will begin. A new drop-down sheet will display a status bar indicating how far along in the Restore process you are. You can also see detailed information by clicking the Show Details disclosure triangle.

Once the Restore process is complete, the drop-down sheet’s Done button will become available. Click Done to close the Restore sheet.

Restore Using a Startup Drive

When you use the Restore function, both the destination and the source must be able to be unmounted. Your startup drive can’t be active if you want to restore it. Instead, you can start your Mac from another volume that contains a bootable version of the Mac OS. The one you use can be any volume attached to your Mac, including a USB flash drive, an external, or the Recovery HD volume.

Why Use Disk Utility’s Restore Function?

Disk Utility is free and included with every copy of the Mac OS. And while the various cloning apps have a lot more features, if you don’t have access to third-party apps, using Disk Utility will create a perfectly usable clone, although it may require a few more steps and lacks some nice features, such as automation and scheduling.

Issue: How to fix “Couldn’t Unmount Disk” Error on Mac?

I was trying to erase my drive on MacBook, but I received an error message saying “Disk Erase failed with the error: Couldn't unmount disk.” What does it mean? Is there something that I can do about it?

  • How to deal with “Couldn’t Unmount Disk” error
  • Check USB Boot Drive
  • Use Recovery Partition
  • Use the command line to fix “Couldn’t Unmount Disk” error
  • Access geo-restricted video content with a VPN
  • Don’t pay ransomware authors – use alternative data recovery options
  • References

“Couldn’t Unmount Disk” is the error that, in most cases, appear when users try to format internal disk by Disk Utility or repair it on the Mac device. Disk Utility is an important feature that helps to solve problems on the system. However, it can still fail to fix some of them or even deliver error messages like “Couldn’t Unmount Disk” error.

Due to the “Couldn’t Unmount Disk” error users might encounter these problems as well:

  • Inability to partition Mac HFS;
  • Inability to open particular files or programs;
  • Lost or corrupted data on the hard drive;
  • Sudden elimination of the running application.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

“Couldn’t Unmount Disk” is the error message that appears on the Mac operating system.

“Couldn’t Unmount Disk” error is an error message that might pop up on your Mac’s screen when the device is not allowed to repair particular permissions or directories in Disk Utility, [1] for instance when trying to repair a hard drive. When a device cannot erase or partition the drive, users are delivered one of these error messages:

Disc erase failed couldn’t unmount disc.

Disk Erase failed with the error: Couldn’t unmount disk.

There are several reasons why users cannot complete the necessary tasks because of this error. Usually, the source of the error is a particular boot drive [2] which is modified or corrupted. The alert might also pop up when the driver is being used by other apps or processes. Sometimes, the issue is an internal drive.

However, the error might be triggered by malware as well. Nevertheless, Mac OS X is pretty resistant to various cyber threats; [3] security experts warn about an increase of Mac malware [4] that might sneak inside the device and might trigger various errors and problems.

How to deal with “Couldn’t Unmount Disk” error

If you ever noticed other symptoms besides the error or the ones that resemble the virus attack, you should obtain a professional security software, such as Reimage, and scan the system with an updated tool.

If virus attack was not the problem, try the methods below that will help to fix “Couldn’t Unmount Disk” error. There are a few solutions for the issue, but users should try all of them of one of them doesn't work at first.

Check USB Boot Drive

  1. Make sure that USB boot drive is attached to the device.
  2. Reboot the system. When rebooting hold the Option key. From the appeared menu select the attached boot drive.
  3. Access Disk Utility from the appeared Boot menu (however, if you use Installer disk, go to Utilities menu and click Disk Utility option).
  4. Go to First aid. Verify the disk and repair it if it’s necessary.

Once it’s done, try to complete the same task again. If the “Couldn’t Unmount Disk” error shows up again, try the second method.

Use Recovery Partition

This method should help if the “Couldn’t Unmount Disk” error occurred when formatting a non-boot partition or caused by first aid. The Recovery partition is included in all new OS X versions. Therefore, follow these steps:

  1. Reboot Mac. When rebooting hold down the Option key.
  2. From the appeared menu choose Recovery partition option.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Use the command line to fix “Couldn’t Unmount Disk” error

  • Access Terminal application.
  • Input diskutil list line.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Repair your Errors automatically team is trying to do its best to help users find the best solutions for eliminating their errors. If you don’t want to struggle with manual repair techniques, please use the automatic software. All recommended products have been tested and approved by our professionals. Tools that you can use to fix your error are listed bellow:

Access geo-restricted video content with a VPN

Private Internet Access is a VPN that can prevent your Internet Service Provider, the government, and third-parties from tracking your online and allow you to stay completely anonymous. The software provides dedicated servers for torrenting and streaming, ensuring optimal performance and not slowing you down. You can also bypass geo-restrictions and view such services as Netflix, BBC, Disney+, and other popular streaming services without limitations, regardless of where you are.

Don’t pay ransomware authors – use alternative data recovery options

Malware attacks, particularly ransomware, are by far the biggest danger to your pictures, videos, work, or school files. Since cybercriminals use a robust encryption algorithm to lock data, it can no longer be used until a ransom in bitcoin is paid. Instead of paying hackers, you should first try to use alternative recovery methods that could help you to retrieve at least some portion of the lost data. Otherwise, you could also lose your money, along with the files. One of the best tools that could restore at least some of the encrypted files – Data Recovery Pro.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Jake Doe is the news editor at UGetFix. Since he met Ugnius Kiguolis in 2003, they both launched several projects that spread awareness about cybercrimes, malware, and other computer-related problems.

Is your Mac experiencing the “erase process has failed Mac” error” error? If so, you can benefit from this guide. The “Mac erase process has failed” error happens when you erase the data from your hard drive and attempt to reinstall your macOS or OS X. Fortunately, there are a few tips you can employ to fix this issue. The “Erase process has failed” issue on Mac is problematic because you can’t get to your data and applications. If you are confronting a similar circumstance and searching for the ideal answer, this article has the solution to assist with that.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Video Tutorial: How to Fix Erase Process Has Failed on Mac?

Part 1: How to Fix Erase Process has Failed on Mac?

What causes the “Mac disk utility erase process has failed” problem on Mac? To learn various ways of fixing, first, you need to know why disk utility won’t erase hard drive. Coming up next are reasons behind the error to assist you with understanding its causes:

  • Unexpected termination of system files
  • Read/write interruption
  • Unexpected Formatting
  • Virus and malware attacks
  • Changes in BIOS setting
  • Corruption of header document
  • List documents hub debasement
  • Boot sector issues
  • Kernel Panic issues like BOSD in Windows

Part 2: How to Fix Erase Process Has Failed Mac?

Fix 1: Erase Disk via Terminal

Step 1: Go to Finder and explore Applications > Utility.

Step 2: Open Terminal as administrator and type “diskutil list.” That will show data regarding different disks and volumes in your Mac.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Step 3: Using the “erase disk” or “erase volume” command, erase a disk or a volume, respectively.

Step 4: The correct configuration to erase disk2 in the HFS+ format of the command is “diskutileraseDisk HFS+ DISK disk2.”

Fix 2: Update the macOS

If your Mac is running on an out-of-date version, then it can experience the “erase process has failed click done to continue” issue. Fortunately, it can, without much of a stretch, be fixed by refreshing your Mac to its most recent firmware. You can search for the most recent update for macOS from the App Store or click the Apple logo from the top, go to System Preferences > Software Update and check for new versions from here.

Fix 3: Erase Selected Volumes Instead

Step 1: Right off the bat, go to your Mac’s Finder > Applications > Utility.

Step 2: Open the Disk Utility application on your framework and go to the upper left corner of the interface. From the dropdown menu, you can decide to see all volumes or external gadgets.

Step 3: Presently, select a volume from the sidebar and format it using the “Erase” button on the toolbar.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Fix 4: Adjust the Security Levels for Formatting an External Device

Step 1: Go to the Disk Utility application on your Mac and connect your external device with it.

Step 2: Presently, select the gadget from the sidebar and press the “Erase” button. From the new window, go to its Security Options.

Step 3: From here, you can change the security levels for formatting the gadget. Keep the security level on the lower side to not get the “can’t erase Mac hard drive” message.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Fix 5: Use a USB Boot Drive

Step 1: Reboot your Mac after connecting the USB to it.

Step 2: Hold down the OPTION key during boot, and select the attached boot drive.

Step 3: At the boot menu, go to Disk Utility > First Aid and confirm the disk, and fix if necessary.

Step 4: Presently play out the first task that tossed the “can’t erase Macintosh HD” message.

Fix 6: Use Mac Recovery Partition

Step 1: Reboot the Mac holding down the OPTIONS key, and pick the Recovery partition

Step 2: Select “Disk Utility” from the boot menu and go to “First Aid” to check and fix the disk, or format the disk by clicking the “Erase” option.

Step 3: This process will settle the “disk erase failed Mac” error.

Fix 7: Forcibly Unmount a Disk via Terminal

Step 1: From the Mac OS command line, input the following command: “diskutilunmountDisk force /Volumes/DRIVENAME”

Step 2: DRIVENAME is the name of the volume you need to unmount, then, at that point, press the RETURN key to forcibly unmount.

Part 3: How to erase Macbook Air?

The process of formatting a Macbook Air is just a matter of a few clicks. Here is how:

Step 1: Open the Disk Utility application

Disk Utility is an internal application liable for running format procedures on the disk. You can go to Finder > Applications > Utility and get to the Disk Utility application from here.

Step 2: Select a Disk to Format

Presently, you will see all the accessible disks and the associated gadgets on the sidebar of the Disk Utility application that you wish to format.

Step 3: Erase the Chosen Disk

Select the internal drive and go to the Disk Utility toolbar on the right and select the “Erase” button. That will show a window to make changes to format the drive. For example, you can give it another name, change its file system, etc.

Bonus: How to Recover Data from an Erased Disk on Mac?

Before formatting a disk, think about taking a backup of your data. However, considering you have not taken an earlier reinforcement and have designed your disk, utilizing a data recovery tool would be best if you lost data due to the “erase Macintosh HD failed” error. You can take the help of Tenorshare 4DDiG, which is a very dependable tool supporting all the macOS versions. The application has probably the best recovery rates and with an easy method to use.

I have an external hard-disk with a single Mac OS Extended partition. This disk stopped working couple of days ago. I tried to repair the partition with disk utility but no luck. The error message is the following:

Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.

Any ideas or tools I can try to repair my disk?

15 Answers 15

There is a chance to repair it with command line (in Terminal) with the terminal utility as described in Apple’s support docs, shown below:

Use the command line and the fsck_hfs -l command.

Start up your computer and log in as an administrator.

Open Terminal (/Applications/Utilities).

At the prompt, type the following command and then press Return to determine your filesytem ID:

Look for some lines of text that look like this:

Make a note of the External Disk “disk” name that appears after /dev/, such as “/dev/disk0s3.” This is your filesystem ID for your External volume.

At the prompt, type the following command and then press Return:

Then type the following command, where “disk1” is your filesystem ID you noted in step 4, then press Return:

When prompted, enter your admin password, then press Return to begin the verification.

You should see messages like these during the disk check:

How to use your mac’s disk utility to partition wipe repair restore and copy drives

When you plugin a damaged Apple_HFS disk into Mavericks/Yosemite it runs fsck_hfs on its own.

You can see the output (in Terminal):

Wait for it to finish before running repair yourself.

Also repair needs to be run repeatedly to repair some errors. I recently needed to launch it 7 times but it repaired the disk successfully in the end. You can use either fsck_hfs or Disk Utility.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

You may not need to repair the disk!

Is this an external drive you’re sharing between a Mac and a Windows PC? I’ve had this issue a few times with a disk formatted FAT32. If you don’t unmount your disk properly when you remove it from your Windows PC, the whole volume will be marked as “busy” and you’ll be prompted to repair the volume if you look at it in Apple’s Disk Utility. However Disk Utility will fail to repair the volume, and report:
Can’t open (Resource busy)
File system check exit code is 8.

The fix is easy, just plug that drive back in to a Windows PC, and unmount it properly before plugging it into your Mac.

It’s not uncommon for a USB drive to be disconnected by just yanking out the cable, and usually that doesn’t cause any trouble, and integrity is verified when you plug it back in. Ideally Macs would recognize this common issue and work around it, but it appears they only trust Microsoft to validate that the filesystem is OK.

Make use of Remo Recover Mac, advanced software to recover data lost or deleted from a Mac device. This software can easily restore more than 300 file formats like photos, videos, documents, etc.

    John Harris
  • March 9, 2022

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Usually, there are no chances of losing data while using Mac Recovery Mode. Mac Recovery Mode is the built-in recovery option offered with your Mac that provides various tools to fix issues. You can start your Mac, reinstall it or recover its certain software related issues or repair disks using Mac OS Recovery utilities. When you use Recovery Mode tools there is no chance of losing data unless you reinstalling Mac or using disk utility without backup. So, here is how to make use of this Recovery mode.

What does MAC recovery mode do?

Mac OS recovery mode offers various utilities like –

  • Restore from Time Machine backup
  • Reinstall Mac OS
  • Get Help Online
  • Disk utility

Based on the requirement you can select a specific option and proceed further. In case of any unfortunate scenarios if normal recovery mode is not working you can make use of internet recovery Mac.

How do I boot into recovery mode?

To launch Mac Recovery Mode, reboot the Mac, hold Command and R keys together at startup window. Release the keys when you see the macOS Recovery window.

How to Reinstall Mac OS from Recovery Mode

Here is how to reinstall macOS in Recovery mode:

  • Select theReinstall macOSoption
  • Click Continuebutton
  • Again opt Continue and select Agreetwice
  • If the Installation setup asks you to select Macintosh HD or Macintosh Data select Macintosh HD
  • Provide your Apple IDandpassword if you are prompted
  • Click the Installbutton

Now, your Mac machine will undergo normal macOS installation, then restart.

The key combinations you choose, determine the version of macOS you like to install on the Mac system when you select the Reinstall macOS option.

Here are the 3 different key combinations available:

  • Command + R -> Installs the latest macOS version that was installed on your Mac system
  • Options + Command + R-> Upgrades your OS to the latest compatible macOS version
  • Shift + Option + Command + R-> Installs the same version of OS X that your Mac got 1st or the closest version

Sometimes a user may encounter data loss when using Mac Recovery mode to reinstall OS X, due to various reasons like improper actions, error messages, unavailability of data/files while creating a backup, etc. So, when you might come across such a data loss crisis check your Time Machine backup and restore your lost data from it.

How to Restore Mac from Time Machine Backup?

When you use Time Machine back up while in recovery mode, you will be given two options

  • Just to restore files from Time Machine backup
  • Restore both Mac OS and files using Time Machine backup

How to Restore from Time Machine Backup Using macOS Recovery Mode?

  • Click Restore from Time Machine Backup in macOS Recovery mode
  • Carefully go through the Restore Your System page and Continue
  • Connect and select your Time Machine backup drive and hit the Continue button
  • Select the most recent backup of your hard disk among the showed backups and proceed

Now, your Mac will restore the hard drive from the Time Machine backup. Once the process gets completed, your Mac will be rebooted.

In case, Time Machine backup is not available then make use of an effective data recovery tool like Remo Recover (Mac) which is available online and restore your lost data immediately.

How to Recover Lost Data Using Remo Recover?

Step 1: Download Remo Recover software & install it on your computer and launch it to begin the data recovery process.

Step 2: Launch Remo Recover (Mac) wizard and click on the Recover Volumes/Drives button. Select the hard disk drive/volume from where you want to recover data and click Next.

Step 3: The software deep scans the drive and displays all recovered data from it. Go through the list of recovered files and Preview them.

Step 4: Finally, mark your required files and save them in a safe location of your choice.

You can use Remo Recover Mac to even recover lost data from failed iMac, MacBook, or any other Mac machine. This is one of the best data recovery software for Mac which is available on all the Mac OS versions including Catalina.

How to Check Startup Disk in Mac Recovery Mode?

  • Click Disk Utility from macOS Recovery mode and click Continue
  • Select on your startup drive from the Disk Utility menu
  • Select First Aid and click the Runbutton
  • First Aid will check and verify the health of your Mac startup drive
  • When the process gets completed, click Done
  • Select Disk Utility from the menu and choose Quit Disk Utility

These are some of the easy options provided Mac to help its users fix any sort of issues they face while working on Mac. However, ether while reinstalling Mac or while using disk utility to fix issues, keep a backup copy of your data. In case, no backup then the Remo Hard drive recovery tool will help you recover all your files in simple steps.

Also Read:

John Harris

Senior Editor, Content Analyst and a fan of exceptional customer service. John develops and publishes instructional and informational content regarding partition management, Windows hot-fixes, data management and computer troubleshooting.

As a tenured data recovery specialist, John shares exceptional insights and blog posts about data loss and data recovery across any storage device. With 8+ years’ experience in writing for Data Recovery for both Mac OS and Windows OS computers, he is an avid learner who always wants to polish and simplify the data recovery process. John passes his free time playing Chess and reading Science Fiction novels.

Starting your Intel or Apple silicon Mac in Recovery Mode provides the tools you need to solve various problems. It is typically your last chance to repair the startup disk, reinstall macOS or restore from a backup after a fatal failure that prevents your Mac from starting up properly. In this tutorial, you’ll learn how to enter Recovery Mode at boot time and use the built-in recovery tools to bring your Mac in perfect working condition.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Our prior tutorials educated you on the ways to start up your Mac from a bootable media, pick a startup disk at boot time or after the fact, mount another Mac’s startup drive on your desktop in Target Disk Mode and boot your computer in Safe Mode or Verbose Mode.

macOS startup modes can be quite helpful. For instance, you may use them for troubleshooting complex issues that might require more than fixing disk permissions. However, the aforesaid startup modes aren’t very helpful if the startup disk has become corrupted or damaged. And that is where knowing how to start up your Mac in Recovery Mode can come in handy.

What is Recovery Mode

Recovery Mode is a special mode that loads macOS’ built-in recovery tools from a special disk partition that holds a recovery image along with a copy of the macOS installer.

If your Mac cannot be recovered in any other way, use Recovery Mode to diagnose disk problems, get help online or install the version of macOS that previously ran on this Mac.

Use Recovery Mode to:

How to enter Recovery Mode on your Intel Mac

1) In the Apple menu choose Restart, or power on your Mac.

2) As your Mac restarts, hold down the Command – R combination immediately upon hearing the startup chime. Hold the keys until the Apple logo appears. If you own a Mac notebook, press the keys on its built-in keyboard as the keystroke might not register on external keyboards.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

If you see a login window or your own desktop, you didn’t press the keyboard combination early enough and have booted in regular macOS mode. Restart your Mac and try again.

3) If asked, type in your administrator username and password. After a few seconds (or minutes, depending on your setup), the macOS Utilities window will appear.

How to use your mac’s disk utility to partition wipe repair restore and copy drives How to use your mac’s disk utility to partition wipe repair restore and copy drives

At that point, you can do any of the following:

  • Restore from a previous Time Machine backup
  • Reinstall macOS
  • Access Safari to get help online
  • Launch Disk Utility

How to enter Recovery Mode on M1 Mac

Here’s how to enter Recovery Mode on Mac with Apple silicon (M1, M1 Pro, M1 Max) running macOS Big Sur and later:

1) Click the Apple menu and choose Shut Down.

2) Now press and hold the power button until you see “Loading startup options”.

3) Click Options.

4) Lastly, click Continue and enter the password for an administrator account, if requested.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

How to exit Recovery Mode

To exit macOS Recovery Mode, click on the Apple icon  in the Menu Bar, and select Restart or Shut Down. Additionally, you may also select Startup Disk from the Apple menu to choose a different startup disk before exiting.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Standard Recovery vs. Internet Recovery

If the recovery partition itself is damaged and you cannot use Recovery Mode, enter Internet Recovery Mode by pressing Command – Option – R or Command – Option – Shift – R at boot time.

Internet Recovery basically starts up your Mac directly from Apple’s servers and performs a quick test of its memory and hard drive to check for hardware issues. For example, if the boot sector is missing on the startup volume, or the recovery partition itself has become damaged or corrupted, your Mac will automatically enter the Internet Recovery Mode.

Check out our tutorials on how to start up your Intel-based Mac in Internet Recovery Mode for complete details about the process. If you have a Mac with Apple Silicon, the steps to enter built-in Recovery Mode and Internet Recovery Mode are the same.

Related tutorials

Check out these resources that cover a myriad of ways you can start up your Mac:

Do avail the trial version of Stellar Data Recovery Professional software if need for data recovery arises.

In absence of Recovery HD partition, it is almost impossible to restore a Mac unless a bootable USB isn’t available.

Startup Menu!

Check whether your iMac or MacBook computer is still showing a workable Recovery HD? Use the below steps for locating the Recovery HD partition:

  1. Switch off the Mac system and turn it on again
  2. Without delay, press the Option key to launch Mac’s startup drive menu
  3. Once the startup drive menu is loaded you may locate the Recovery HD alongside your startup disk. However, if the Recovery HD is missing then you can confirm its loss or deletion
  4. Restart macOS since Recovery HD isn’t found

Mighty Terminal!

  • Launch Terminal and type diskutil list
  • The terminal will throw you an output as below:
  • Usually, Recovery HD is listed third from the top i.e. disk0s3

If the terminal displays your Recovery HD in the list of all mounted partitions then you should launch Recovery Mode however you must reset the PRAM.

Internet Recovery!

No luck in locating the Recovery HD partition even after the Terminal shows it up, then you must take the help of Internet Recovery. This option is available for Mac to reinstall macOS using the Internet. Follow below processes:

  1. Shut down the Mac and power it up
  2. Press and hold Command + Option + R until the screen displays a globe with the message “Starting Internet Recovery. This may take a while
  3. Soon the macOS utilities will load on the screen, which will provide the option ‘Reinstall macOS’.

After a successful installation of the macOS through Internet Recovery, the missing / deleted or lost Recovery HD will also be restored.

Mac Data Recovery Software

A data recovery software can’t restore OS X neither it can provide any help in locating a missing Recovery HD. However, Stellar Data Recovery Professional for Mac helps the user to boot up a corrupt or inaccessible Mac and recover files from the startup disk. Once data is salvaged from the troublesome Mac startup drive, the user can then go ahead with the Mac restore.

About The Author

Donald is a Senior Content Writer at Stellar with over 7 years of experience in data recovery, IoT, and AI technologies domain. He is a tech enthusiast who enjoys researching and sharing solutions to resolve complex technical issues.

Before you can use your new SSD with your Mac® system, or install macOS® onto it, you have to initialize and partition it first. Follow the steps in this article if you are using OS X El Capitan or later. If you have not upgraded, follow our guide for earlier versions of OS X.

  1. If you are adding a drive to an existing setup, connect the SSD using a USB adapter or other external connection method and enter Disk Utility, or install the SSD internally into your system and enter Disk Utility via the OS X Recovery tool or your installation media. When the SSD is noticed by the Mac computer, you will see a message telling you that the drive cannot be read by this computer. In this message, click the Initialize button.
  2. The Crucial SSD will be listed in Disk Utility. Highlight the SSD and click the Erase button.
  • In macOS High Sierra, we have had reports of the new SSD not appearing for initialization and erasing/partitioning.
  • The new default for Disk Utility Show Only Volumes (a formatted partition of a drive) as seen below keeps the SSD from being seen. Toggling this to Show All Devices using the dropdown in the upper-left of the utility will expose the drive.
  • After this has been done, the displayed list of disks does not automatically refresh. The easiest way to force a refresh is to close and reopen Disk Utility from your Utilities.

3. Type in the name you would like for the new partition and verify that it’s set to "GUID Partition Table".

4. Verify that the selected format has defaulted to "Mac OS Extended (Journaled)".

5. Select Erase. The drive will now be partitioned and formatted.

6. When the Disk Utility is done, close it.

The SSD should now be visible on your desktop with the new name you gave it, as well as during the drive selection menu if your run an OS X installer.

If you need assistance with the physical installation of your SSD, we offer guides for installing a replacement SSD here.

©2019 Micron Technology, Inc. All rights reserved. Information, products, and/or specifications are subject to change without notice. Neither Crucial nor Micron Technology, Inc. is responsible for omissions or errors in typography or photography. Micron, the Micron logo, Crucial, and the Crucial logo are trademarks or registered trademarks of Micron Technology, Inc. OS X, macOS, and Mac are trademarks of Apple, Inc., registered in the United States and/or other countries. All other trademarks and service marks are the property of their respective owners.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

By enabling a hidden debug feature in Disk Utility, you are able to both view and mount hidden partitions on hard drives in Mac OS X. Hidden partitions include things like Linux swap, GUID partitions, a Windows Recovery drive, and the Mac OS X Recovery HD partition, and once they’re mounted they can be edited or formatted just like any other drive. There are many cases where you’ll want access to these hidden partitions, and we’ll show you exactly how to do that.

How to Enable Debug Menu in Disk Utility to Show & Mount Hidden Partitions in Mac OS X

Before gaining access to the hidden partitions you will need to turn on the hidden debug menu within Disk Utility:

    Quit out of Disk Utility, and launch Terminal to type the following defaults write command:
    defaults write DUDebugMenuEnabled 1

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  • Now the hidden partitions will displayed alongside mounted visible partitions, but they will appear grey rather than black
  • Right-click on the greyed out partition to mount and choose “Mount [Drive Name]”

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Going back to the Finder, you’ll now find the hidden partition is now visible as any other drive, and it will even appear on the Desktop if you have icons shown there. Be aware that if you start moving or deleting files on crucial partitions like Recovery HD, they very well may not work when you need them to.

It’s really not recommended without a compelling reason (like downgrading to 10.6), but you can delete “Recovery HD” using this method to make the drive visible. That may be necessary if you’re planning on undoing a dual boot between Snow Leopard 10.6 and Lion but otherwise is likely not a good idea.

How to Disable the Disk Utility Debug Menu on Mac OS X

To hide the debug menu again from Disk Utility, use the following defaults write command:

defaults write DUDebugMenuEnabled 0

Note this applies to versions of Mac OS X prior to El Capitan, like Yosemite, Mavericks, Mountain Lion, and Lion, as the Debug menu was removed from later versions of Disk Utility in MacOS Mojave, Catalina, High Sierra, Sierra, etc.

If you know of any method to enable the Debug menu in later versions of Mac OS X, share with us in the comments below.

The OS X recovery partition is a tool that is built into all Macs running OS X 10.7 (Lion) or higher. The recovery partition is a collection of system recovery tools that enable users to diagnose and fix their Mac if it is unable to boot.

When to use the recovery partition:

If, when your turn on your Mac, it displays this flashing-question-mark-folder-of-death:

Then your Mac is telling you that it is unable to find a bootable device, meaning that it is unable to launch Mac OS X. This usually means one of two things: either that your Macintosh Hard Drive has failed or that your installation of Mac OS X has become corrupted. In either case, your first step should be to boot into the OS X recovery partition in order to diagnose the problem.

The recovery partition is accessible even if your computer is able to boot, and can be used at any time to re-install Max OS X in the case of a virus or operating system corruption.

How to boot into the OS X recovery partition:

In order to access the recovery partition, power off your Mac. Now locate both the Command and R keys on your keyboard, and start your Mac while holding them down. Continue holding Command-R until the Apple logo appears. Once your computer has finished booting into OS X recovery, you should see the following screen:

Note: If your computer instead boots to the flashing question mark folder screen or a Mac login screen, then you did not hold down Command-R early enough or long enough, and you should turn off your Mac and retry.

Using Disk Utility to check your hard drive:

If your computer was unable to boot (flashing question mark folder) then your first step is to determine whether or not your hard drive is physically damaged. Hard drives are the computer components that break most frequently as they contain a disk that spins thousands of times per minute, and are relatively prone to breakage.

To check your hard drive, first click Disk Utility in the Mac OS X Utilities window. The Disk Utility window will pop up:

How to use your mac’s disk utility to partition wipe repair restore and copy drives

On the left menu, Disk Utility will display all storage devices present on your computer (most people will only see one device, their primary hard drive). Select the drive that Mac OS X is installed on, (usually called Macintosh HD) and then click Verify Disk. When it is finished, Disk Utility will inform you of any problem that may exist on the drive. If it does not find any, then it is likely that your Operating System is corrupt.

If Verify Disk does find problems with your drive, then click Repair Disk. What Repair Disk does is to scan the hard drive and fix any inconsistencies it identifies in the way that files are stored on the drive. Repair Disk will not help if there are areas of the hard drive that are physically damaged.

Note: Both Verify Disk and Repair Disk will list the errors they detect/fix. For more information about what each error means, check out Apple’s Disk Utility Documentation.

Using Recovery Partition to run a Time Machine system recovery:

If you have configured and backed up your computer using Time Machine, then it is possible to recover your computer to the state it was in during one of your Time Machine backups.

To do this, simply plug in the external drive that your Time Machine backups are saved to, and then select the Restore from Time Machine Backup option in the Mac OS X Utilities windows. This will bring up the Time Machine recovery user interface that will allows you to inspect each Time Machine backup present on your drive, and to select the one you want to restore from.

Reinstall Mac OS X using the Recovery Partition:

If your Mac won’t boot, and you have verified that your hard drive is working correctly using Disk Utility, then your installation of Mac OS X is corrupt, and requires reinstallation. Note: This process will delete all your data and installed programs, and will install a fresh version of Mac OS X.

Mac OS X reinstalls itself by downloading a copy of the version of Mac OS X that came with your Mac from the internet and then installing it on your computer (you may need to log in with your Apple ID in order to begin downloading).

To begin, connect your computer to the internet using either Ethernet or wireless and then click Reinstall Mac OS X from the Mac OS X Utilities window. Note: For those using wireless: only wireless networks with certain encryption types will work with OS X recovery. For UMass Students: The type of wireless encryption we use with both the UMass and UMass-Secure1x wireless networks will NOT work with OS X recovery. In order to re-install OS X you must use a properly configured home or public network. For more information about which wireless network types are supported, visit Apple’s OS X Recovery Documentation.

Note: Sometimes Mac OS X install will fail. If this happens, one common issue is that you need to reset your NVRAM. To do this, shut down your computer and then start it while holding down the Command, Option, P and R keys simultaneously. Hold these keys down until the computer restarts and you hear the start up sound for the second time.

Disk Utility is Apple’s go-to macOS app for finding and repairing common disk errors, but if it’s your Mac’s internal disk that’s the problem, then your Mac might not even start up into macOS. Fortunately, in such cases you can still get to Disk Utility from macOS Recovery.

alt=”macbook air m1 unboxing feature” width=”1616″ height=”902″ />
On Intel-based Macs, pressing the Command-R key combination immediately on booting invokes Recovery mode. On Macs powered by Apple silicon, such as the M1 MacBook Pro, the process is a little different, as described in the following steps.

  1. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
  2. Click the gear icon labeled Options.
  3. Click Continue.
    alt=”m1 mac startup options” width=”3888″ height=”3022″ />

Repair Your Startup Disk in Disk Utility

  1. Choose View -> Show All Devices from the toolbar in Disk Utility.
    alt=”macos big sur recovery mode disk utility show all devices” width=”880″ height=”500″ />

If Disk Utility found errors that it was unable to repair, you may need to erase the disk and reinstall macOS. If you don’t have a separate backup of your data, contact Apple’s support services for next steps.

As I’ve said before, slowing down is not an option for me. At one point, I realized that there were plenty of files on my Mac that I didn’t need any more, but too many to delete individually. In other cases, your Mac can be experiencing some major malfunctions: constant crashing, locked controls, slow boot times, missing files, etc.

Often, the best option to fix these problems would be to reformat your computer and reinstall your OS, but since most of us don’t plan on ever taking this drastic measure, we don’t obtain a recovery disc or thumb drive.

Thankfully, the geniuses over at Apple have made the process easy for us—no need for a disc; no need for a drive—all you need is a decent internet connection. With just a few clicks of some buttons and your Mac is gonna be running like it did the day you got it. Best of all, this will work with Lion, Mountain Lion, Mavericks, Yosemite, and El Capitan.

Step 1: Back Up Your Files!

Okay, so you may have a lot of files that you want to get rid of, but you definitely have some files you want to keep. In my case, I even have programs I want to keep so I don’t have to re-download them after the process is over.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Use a writable CD/DVD, a USB drive, or any of the multitude of cloud options to keep your important files backed up. You could also create a Time Machine backup, but I wouldn’t do a full restore later—just pick and choose things you want back after a fresh install—otherwise it could run just as sluggishly or erratic as it did before.

Step 2: Restart Your Computer

Once you’ve double-, triple-, and quadruple-checked your backups, restart your computer.

Step 3: Press CMD+R

The second you see a grey screen, hold the CMD and R keys down for about 15 seconds, then let go and you’ll be taken to OS X Utilities recovery.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Step 4: Open Disk Utility

Double-click on Disk Utility and a menu will pop up.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Step 5: Wipe Your Hard Drive

Then proceed to highlight your computer’s hard drive; select the Erase tab, make sure OS X Extended (Journaled) is selected, then hit the Erase button.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

In El Capitan, Disk Utility looks slightly different, as you can see below.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

In El Capitan, after you select the Erase tab, a pop up will appear with the details. Keep the default settings and select Erase.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Once erased, exit Disk Utility.

Step 6: Reinstall OS X

Click the Reinstall OS X option in the menu and proceed to follow the directions. You will need to be connected to the Internet, so make sure you’re plugged in via Ethernet, or are connected to a Wi-Fi network.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Voilà! You Have a Fresh Install of OS X

You should now have a fresh copy of Mac OS X installed, and your computer is back to its factory settings. All without the need for a recovery disc or thumb drive. If you want to play it safe and create a bootable install drive for Mac OS X, you can do so using our guides here for Lion/Mountain Lion, Mavericks, Yosemite, and El Capitan.

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When you decide to backup your Mac, it’s important to choose the right way to do it. While using Time Machine is a great option, sometimes it helps to consider all your options.

For example, if you’re looking to replace your MacBook’s hard drive, consider creating a disk image of your hard drive and store it on an external drive. You can do it by using Disk Utility.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Creating a backup of your Mac will allow you to make an exact copy of your current hard drive and restore all of the information when you get a new drive installed. Having a backup copy of your startup disk also removes the risk of losing your data while performing system updates.

Prepare to Backup Your Mac

Before you begin backing up your Mac, there are a few things you need to keep in mind.

  • Disk Utility is free and included with macOS. You can find it in Applications > Utilities.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  • Before you start the Mac backup, make sure you have an internal or external hard drive ready. It needs to be large enough to store the data you have on your current startup disk and that it doesn’t have anything you want to keep on it. The backup process will erase the receiving drive.
  • The destination drive also needs to be properly formatted. Especially if you’re using an external hard drive or an external SSD to back up your data, as most of them don’t come pre-formatted for Macs.
  • Check the destination drive for errors before you begin the process.
  • Finally, the whole process will take anything between half an hour and several hours, depending on the data you’re backing up. So make sure your computer is plugged in and you won’t need to use it in the next couple of hours.

Verify the Destination Drive Using Disk Utility

How to use your mac’s disk utility to partition wipe repair restore and copy drives

If your destination drive has any errors, it might cause issues with your backup, and you won’t have a reliable copy of your startup drive.

We recommend using Disk Utility to verify the destination drive before you start the backup process. In order to do that, follow these steps:

  1. Open Disk Utility.
  2. From the device list, select the destination drive.
  3. Click First Aid in the top of the app. Then choose Run.

This will start the verification process that shouldn’t take longer than a few minutes.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

If Disk Utility shows verification errors, you’ll need to repair the disk before moving on. To do that, click the First Aid button in Disk Utility again to repair the disk. If you get a confirmation message in the end, you’re good to go.

On the contrary, if there are still errors listed after you’ve repaired the disk, you’ll need to repeat the whole process until the disk is fully repaired and you get the Disk Utility confirmation message.

Start The Mac Backup Process

Now that your destination drive is ready, you may begin the cloning process and create a copy of your startup disk. To do that, follow these steps:

  • In Disk Utility, select your startup disk.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  • From the Disk Utility menu, choose File >New Image > Image from “name of your drive”.

What to Do if The Option to Create an Image is Greyed Out

Sometimes the option to create an image from the current disk will be greyed out. That happens because some macOS versions have rather complex file system arrangements. Disk Utility will sometimes only show you volumes and not all available devices.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

In order to fix that, open the View menu in Disk Utility and choose Show All Devices. You will then see a different file structure. To create an image of your internal disk, you’ll need to choose it under “Internal” and then repeat the process FIle > New Image > Image from “name of your disk”.

  • Before starting the backup, you can change its name. If you’re only using that disk for backup purposes, we recommend choosing something like Mac Backup to help you remember it in the future.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  • Select your destination drive.
  • For general use, choose the default options: “compressed” under Format and “none” under Encryption.
  • Click Save. This will start the backup.

Disk Utility will require some time to create the backup of your Mac depending on the amount of data you have on your startup disk. Once it’s finished, Disk Utility will notify you. Then you’ll have a complete copy of your hard drive which you can use to restore your data later on.

Use Boot Manager To Check Your Copy

One extra precaution that you can take is checking your backup to see if it works as your startup disk. After your Mac backup is complete, you’ll need to restart your computer and see if it can boot from the backup copy. You can do it using the Mac’s Boot Manager.

  1. Shut down all applications.
  2. Click on the Apple menu and choose Restart.
  3. When your screen turns black, hold down the Option key until your screen turns gray and you see icons of bootable hard drives.
  4. Choose the backup copy you just created.

Your Mac will now boot from the backup you just made. To return to your startup disk, you’ll need to restart your computer once again.

If you don’t want to lose your data, taking a backup of your Mac should become a habit for you. If you can’t remember when was the last time you’ve made a copy of your files, it’s safe to say it’s time to do it again.

There are many different ways to backup your iOS and macOS devices. You can choose the one that suits your needs best, or even better – use different methods for different types of data. Aside from Disk Utility, try using iCloud for backing up your photos, and Time Machine for creating copies of larger files.

Anya is a freelance technology writer. Originally from Russia, she is currently a full-time Remote Worker and Digital Nomad. With a background in Journalism, Language Studies, and Technical Translation, Anya couldn’t imagine her life and work without using modern technology on a daily basis. Always looking out for new ways to make her life and location-independent lifestyle easier, she hopes to share her experiences as a tech- and internet-addict through her writing. Read Anya’s Full Bio

I want to do the update to the latest version of Mac OS X Sierra. When I launch the update I get following error message:

This Disk doesn’t use the GUID partition Scheme

Use Disk Utility to change the partition Scheme.

Select the disk, choose the Partition tab, select the Volume Scheme and then click Options.

It is a 2012 MacBook Pro. The original HDD was replaced with a new SSD drive a few month ago. To do the replacement, I used Super Duper to clone the 2 drives.

When I do diskutil cs list, I get

No CoreStorage logical volume groups found

When I do sudo gpt -r show /dev/disk0, I get

start size index contents

0 1 MBR

1 1

2 976773166 1 MBR part 175

What should I do?

5 Answers 5

In Disk Utility, near the close/minimize/fullscreen buttons, you can see a “View” mode dropdown menu. Set the view mode to “Show All Devices”, then you’ll see the “root” drives. Click on a root drive, and then click on the “Erase” button. Now an option to change the “Scheme” from Master Boot Record to GUID appears in the Erase subwindow.

I think you have three alternatives.

Do exactly what the error says, run Disk Utility & format the drive as GUID/HFS+ instead of its current MBR/HFS+
This is destructive & will erase all data
[Something may have changed in Sierra, which I don’t yet have – Volume Scheme is not an option in El Capitan from that tab, only from the Erase tab; so it might be worth checking out to see if it can be done on the fly now]

Re-clone back to the original drive as a backup, then do 1. & clone back.
This is non-destructive but will take some time.

Use a Utility like Paragon Hard Disk Manager which is capable of converting MBR to GUID on the fly, non-destructively. It has a 30-day trial. I’d still recommend a backup – things can always go wrong.

BTW, CoreStorage is optional unless you intend to use FileVault or set up a Fusion drive.

In this step-by-step guide, we have explained how to repair a Mac disk with Utility.

While Mac has a popular reputation for being the sturdiest and most robust machine out there, there are certain unexpected scenarios when your Mac refuses to boot up, and the apps start crashing and freezing. You’ll see a degrade in the system’s performance, and you won’t be able to open documents. While these issues are enough to trigger headaches for Mac owners, they can be resolved easily. Thankfully, Apple has included a handy tool within the Mac that can easily repair your Mac to get rid of these troublesome issues. We know this tool as Disk Utility.

To help you out, in this guide, we have explained the complete steps of using Disk Utility to repair a Mac disk and run first aids. So without further delay, let’s get going.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

What is Disk Utility First Aid?

Disk Utility is a native tool that offers a straightforward way to manage and repair different Mac disks. These include startup disks, storage volumes, and other external drives.
Disk Utility can also be used to partition, restore and format the Mac disks. Disk Utility can be summoned when your disk is afflicted with corrupt data, formatting issues, and has bad structures in a directory.

Now that you know about Disk Utility, let’s go and find out how to repair your Mac disk using this tool.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

How to use Disk Utility?

Practically, using Disk Utility as a Mac disk repair tool is a breeze. All you need to do is to open the Disk Utility, choose the disk, and then run the First Aid. However, before we jump right in and follow these steps, you should prep up your Mac and back it up. This is essential as it will prevent data loss in case of unforeseen circumstances.

Scanning a healthy disk drive is only a matter of a few minutes. However, if your Mac is full of issues and corrupt in some way, the process of Disk Utility can easily gulp up a couple of hours. So it is essential to use Disk Utility only when you have a decent amount of time in hand. So let’s begin:

Back-Up your Mac

Since we are going to repair an already corrupted disk, there is a good chance that the idea can back off. So if Disk Utility is unable to repair your disk, there is a fear of damaging the disk and leaving it in a soiled state. To prevent losing data in such a critical situation, it is essential to back up your disk data before beginning the disk repair process.

If issues with the damaged disk prevent the successful boot of Mac, you won’t be able to boot your Mac at the moment. Thus, you are not in a situation to create a backup of your Mac. So if you have a previously made backup, you will have to rely on it at the moment.

Boot your Mac into Recovery Mode

After creating the disk backup, it’s time to boot your Mac in Recovery Mode. This is essential as it is impossible to repair the Startup Disk when Mac is using the macOS.

  • For this, you need to know whether your Mac is powered by an M1 chip or is running on an Intel processor. Here’s how to find out:
  • Tap the Apple icon located on the top-left of the screen and choose About This Mac from the drop-down.
  • In the next window, you will see your Mac model along with the chip or processor it is using.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

Boot into Recovery Mode on an Apple Silicon Mac

  • First of all, Shut down your Mac completely.
  • Now press the power button to restart and hold the power button until the startup options appear on the screen.
  • Click on Options and then press Continue.
  • Enter the administrator login details if prompted.

Boot into Recovery Mode on an Intel-powered Mac

  • Shut down your Mac
  • Once completely shut down, reboot your Mac by pressing the power button.
  • Then, long-press the CMD+R button until the macOS Recovery screen appears as above.
  • Provide the administrator login credentials to authenticate yourself.

Note: If you are unable to boot in recovery mode, it indicates a hardware issue.

Choose the disk and run First Aid

  • When in the Recovery Mode Screen, go to the menu bar and choose the Utility option.
    From the next menu, choose Disk Utility.
  • Now, in the Disk Utility, go to the Menu Bar on the top and click on View.
  • Next, choose Show All Devices option. All the disks, containers, and volumes currently connected to your Mac will appear on the left sidebar.
  • As you know, the Container and Volumes are a part of any disk. The hierarchy goes this way Disk > Container > Volume.
  • To repair a disk, you need to repair the volumes first then come to the containers having those volumes. Finally, you can begin repairing the disk.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

How to repair a disk on Mac

  • Choose a volume, container, or disk to repair from the left sidebar. It is recommended to begin from the bottom and go upwards to the disk.
  • After making the selection, click on the First Aid button located on the top. Then choose a Run option from the pop-up that opens. You might see a Repair Disk button instead of the Run button.
  • If prompted, enter the administrator password of your Mac to initiate the first aid.

Wrapping Up

There you go! Follow the same process until all the volumes, containers and finally, the disk is completely scanned and repaired. Once the disk repair is completed, go ahead and reboot your Mac. Hope this helps!

Here are six repair methods to help you repair some of the most logical hard drive issues.

More people are known to use computers, and the numbers keep rising. However, data loss from computers arises from accidental occurrences, some of which are preventable.

The good news, even if you lose data from some of those accidents, you can still recover data from a hard drive.

Generally, the current computer hard disk has about a two percent chance of failure. If a hard disk fails or crashes, you will most likely lose all the data.

This article discusses some of the best hard disk repair software for PC. You can also see a list of reliable hard drive repair software by clicking on this link.

There are several ways to repair hard disks that are either damaged or do not work correctly. Each solution will, however, be useful in different scenarios.

We have listed the top six repair methods to help you repair some of the most logical hard drive issues

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  1. Best Overall Hard Drive Repair Software: Disk Drill

Finding reliable hard disk repair software from a crowded market can be devastating, especially when you make the wrong choice and have to check again from different vendors.

Disk Drill is, however, by far the best hard drive repair software on the market today. Both the design and features make it the most effective in recovering over 200 file formats.

Besides, it works on all storage devices including Windows, Linux, Mac etc. without requiring expert skills to operate.

In addition, the software comes with extra free tools for disk monitoring, data protection, hard drive cleanup, data backup, and many more.

If you have a quick hard disk recovery to carry out, download Disk Drill by CleverFiles and consider your problem solved.

Some hard drives that are completely damaged may fail to boot and make your data recovery or repair process quite complicated.

To avoid doubt, this software will also get files off a hard drive that won’t boot. Once you download Disk Drill to your PC, run the install process and launch the software.

Once the software runs on your PC, select the recovery option and choose the files you need to recover.

You can also preview the files before choosing the suitable files for recovery. This option helps you filter through your lost files and folders so that you do not recover files you do not need.

  1. Best Partition Manager: GParted

Hard disk partitioning is an excellent way to manage your hard disk. With GParted, you can easily resize, copy, and move your hard drive partitions without losing data.

The graphical partition editor will also help you shrink a partition to create more space in your drive.

How to use your mac’s disk utility to partition wipe repair restore and copy drives

  1. Best Hard Disk Manager: AOMEI Partition Assistant

This is yet another tool you can use to repair hard disks. It helps you move, resize, or create partitions.

The software can solve many other hard drive problems, such as migrating the entire operating system from a damaged hard drive to a different one, converting MBR drives to the GPT partition scheme, or shredding sensitive files.

  1. Best Disk Usage Tool: WinDirStat

As much as repairing a corrupted hard drive is a priority, so is it to understand the type of files stored in it. You, therefore, need software that can provide a detailed view of the stored data in a hard drive before repair begins.

WinDirStat is a disk usage statistics viewer. It uses an in-built treemap-view that represents files with colored rectangles. The area of each triangle is proportional to the size of files stored.

  1. Best Disk Wipe Tool: DBAN

Some disk damages indeed occur beyond repair. Due to this unfortunate reality, it is essential to have a way that you can move your data to a safer storage device and wipe the damaged drive before you dispose of it.

Also, remember that some of the disk format utilities that accompany Windows do not guarantee the complete removal of data.

They simply mark disk spaces as free and can still be accessed and data recovery is done with versatile tools such as Disk Drill.

DBAN can wipe any storage device clean. This will help you clean hard drives that are damaged and not reusable.

  1. Best For Older Computers: SpinRite

If your hard drive runs on an older computer, then SpinRite remains one of the best software for hard drive repair.

Even though the last version of this tool was released in 2004 and there has been no upgrade, it remains one of the best applications to recover lost data from magnetic data storage devices.

The software runs inside a live version of FreeDOS and can be used to scan any computer. Besides, it supports a broader range of systems, including Windows, DOS FAT, Novell, Macintosh, Linux, etc.

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