Utilities Mac

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Jul 31, 2020. Dec 21, 2017. Mar 17, 2020.

Disk Utility can find and repair errors related to the formatting and directory structure of a Mac disk. Errors can lead to unexpected behavior when using your Mac, and significant errors might even prevent your Mac from starting up completely.

Before proceeding, make sure that you have a current backup of your Mac, in case you need to recover damaged files or Disk Utility finds errors that it can't repair.

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Open Disk Utility

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Start up from macOS Recovery, then select Disk Utility from the Utilities window. Click Continue.
If you're not repairing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder.

Locate your disk in Disk Utility

Choose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility.

The sidebar in Disk Utility should now show each available disk or other storage device, beginning with your startup disk. And beneath each disk you should see any containers and volumes on that disk. Don't see your disk?


In this example, the startup disk (APPLE HDD) has one container and two volumes (Macintosh HD, Macintosh HD - Data). Your disk might not have a container, and it might have a different number of volumes.

Repair volumes, then containers, then disks

For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.


In this example, the last volume on the disk is Macintosh HD - Data.

Click Run to begin checking the selected volume for errors.

  • If there is no Run button, click the Repair Disk button instead.
  • If the button is dimmed and you can't click it, skip this step for the item you selected, and continue to the next item.
  • If you're asked for a password to unlock the disk, enter your administrator password.

After Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself.


In this example, the repair order is Macintosh HD - Data, then Macintosh HD, then Container disk2, then APPLE HDD.

If Disk Utility found errors that it can't repair

If Disk Utility found errors that it could not repair, use Disk Utility to erase (format) your disk.

If your disk doesn't appear in Disk Utility

If Disk Utility can't see your disk, it also can't see any containers or volumes on that disk. In that case, follow these steps:

  1. Shut down your Mac, then unplug all nonessential devices from your Mac.
  2. If you're repairing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
  3. If your disk still doesn't appear in Disk Utility, your disk or Mac might need service. If you need help, please contact Apple Support.

macOS Recovery is part of the built-in recovery system of your Mac. You can start up from macOS Recovery and use its utilities to recover from certain software issues or take other actions on your Mac.

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How to start up from macOS Recovery

  1. Turn on your Mac and immediately press and hold these two keys: Command (⌘) and R. Need help?
  2. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
  3. You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
  4. Startup is complete when you see the utilities window:
  5. After starting up from macOS Recovery, select a utility, then click Continue:
    • Restore From Time Machine Backup:Restore your Mac from a Time Machine backup.
    • Reinstall macOS: Download and reinstall the Mac operating system.
    • Get Help Online: Use Safari to browse the web and find help for your Mac. Links to Apple's support website are included. Browser plug-ins and extensions are disabled.
    • Disk Utility: Use Disk Utility to repair your disk or erase your disk or other storage device.

      Additional utilities are available from the Utilities menu in the menu bar: Startup Security Utility (or Firmware Password Utility), Network Utility, and Terminal.
  6. To quit macOS Recovery, choose Restart or Shut Down from the Apple menu . If you want to choose a different startup disk before quitting, choose Startup Disk from the Apple menu.
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If you can't start up from macOS Recovery

If your Mac can't start up from its built-in macOS Recovery system, it might try to start up from macOS Recovery over the Internet. When that happens, you see a spinning globe instead of an Apple logo during startup:

To manually start up from Internet Recovery, press and hold either of these key combinations at startup:

  • Option-Command-R
  • Shift-Option-Command-R
    Learn more

If startup from Internet Recovery is unsuccessful, you see a globe with an alert symbol (exclamation point):

In that case, try these solutions:

  • Make sure that your Mac can connect to the Internet. If you're not prompted to choose a Wi-Fi network during startup, move your pointer to the top of the screen, then choose a network from the Wi-Fi menu , if available.
  • Press Command-R at startup to try using the built-in Recovery system instead of Internet Recovery.
  • Connect to the Internet using Ethernet instead of Wi-Fi, or vice versa.
  • Connect to the Internet from a different Wi-Fi or Ethernet network. Your network configuration might not allow the Internet access that macOS Recovery needs.
  • Try again later, because the issue might be temporary.
  • Start up from another disk or volume, if available, or use a bootable installer to reinstall macOS.

If you still need help, please contact Apple Support.