How to repair a Mac disk with Deejay Utility

Use the First Aid characteristic of Disk Utility to find and repair disk errors.

Disk Utility can observe and repair errors related to the formatting and directory construction of a Mac disk. Errors can pb to unexpected behavior when using your Mac, and pregnant errors might even forbid your Mac from starting up completely.

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

Open up Deejay Utility

In general, you can just open Deejay Utility from the Utilities folder of your Applications folder. Nevertheless, if your Mac doesn't outset upwards all the manner, or yous want to repair the disk your Mac starts up from, open up Disk Utility from macOS Recovery:

  1. Determine whether you're using a Mac with Apple tree silicon, then follow the appropriate steps:
    • Apple silicon: Turn on your Mac and go along to printing and hold the ability push until you lot come across the startup options window. Click the gear icon labeled Options, then click Keep.
    • Intel processor: Turn on your Mac, then immediately press and hold these two keys until you lot see an Apple logo or other image: Command (⌘) and R.
  2. Y'all may exist asked to select a user you know the password for. Select the user, then click Next and enter their administrator password.
  3. From the utilities window in macOS Recovery, select Disk Utility and click Proceed.
    macOS Recovery options with Disk Utility selected

Select your deejay in Disk Utility

Cull View > Show All Devices (if bachelor) from the carte du jour bar or toolbar in Deejay Utility.

Disk Utility: Show All Devices

The sidebar in Deejay Utility should now show each bachelor disk or other storage device, beginning with your startup deejay. And below each disk you should see whatever containers and volumes on that deejay. Don't run into your disk?

Disk Utility: Containers and Volumes
In this example, the startup disk (Apple SSD) has one container and two volumes (Macintosh HD, Macintosh HD - Data). Your disk might not have a container, and it might have a dissimilar number of volumes.

Repair volumes, then containers, then disks

For each disk that yous're repairing, start by selecting the concluding book on that disk, then click the Offset Aid button or tab.

Disk Utility: Run First Aid?
In this example, the last volume on the deejay is Macintosh HD - Data.


Click Run to begin checking the selected book for errors.

  • If there is no Run push, click the Repair Disk push button instead.
  • If the button is dimmed and you lot can't click it, skip this footstep for the deejay, container, or volume you selected.
  • If you're asked for a password to unlock the disk, enter your ambassador password.

Afterward Disk Utility is washed checking the book, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running Outset Aid for each book on the disk, then each container on the deejay, then finally the deejay itself.

Disk First Aid: process complete
The order of repair in this example was Macintosh Hd - Data, then Macintosh Hard disk drive, then Container disk4, then APPLE SSD.

When done, quit Deejay Utility. If you used Disk Utility from macOS Recovery, yous can now restart your Mac: choose Apple tree menu  > Restart.

If Disk Utility found errors that it can't repair

If your disk doesn't appear in Disk Utility

If Disk Utility can't see your disk, information technology 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 y'all'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 announced in Disk Utility, your Mac might need service. If yous need help, please contact Apple tree Support.

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