And beneath each disk you should see any containers and volumes on that disk. The sidebar in Disk Utility should now show each available disk or other storage device, beginning with your startup disk. Locate your disk in Disk UtilityĬhoose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility. 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. Start up from macOS Recovery, then select Disk Utility from the Utilities window. Errors can lead to unexpected behavior when using your Mac, and significant errors might even prevent your Mac from starting up completely.īefore 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. You will see the scanning results in the left sidebar with three categories: files path, type and time.ĭisk Utility can find and repair errors related to the formatting and directory structure of a Mac disk. Select the external hard drive that is greyed out in Disk Utility and click Nextto scan for data stored on this drive. Download, install and launch iBoysoft Data Recovery for Mac on your Mac. You will see a message indicating that First Aid will check the volume for errors.
Click on the disk you are concerned about from the list on the left, and then click First Aid. Mac boot drives cannot be unmounted while they are in use, which means you will have to boot your Mac from another bootable device. However, for First Aid to make any repairs, the selected volume must first be unmounted.
First Aid and boot drive You can use Disk Utility's First Aid on the Mac boot drive.
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