Click Disk Utility when in macOS Recovery. Click on your Mac's startup drive in the Disk Utility sidebar. It should be the drive at the top of the sidebar if there are multiple drives. Click First Aid. First Aid will run, checking the health of your Mac's drive. This process could take a little while.

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.

• Download Bootdisk Utility - Create bootable USB disks with your favorite MAC OSX distribution and latest Clover bootloader by turning to this lightweight application.
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• How to Repair a Mac Boot Disk with Disk Utility in Mac OS X. Reboot the Mac and hold down Command+R to boot into Recovery, or hold down OPTION; Select “Recovery HD” at the boot menu; At the Mac OS X Utilities screen, select “Disk Utility” Select the boot volume or partition from the left menu and click on the “Repair” tab; Repair.

Open Disk Utility

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.

Free Mac Disk Utility

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.

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