Disk energy can examine for and fix errors regarded the formatting and also directory structure of a Mac storage device.

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Disk Utility can fix certain disk problems—for example, lot of apps stop unexpectedly, a document is corrupted, an external device doesn’t job-related properly, or your computer won’t start up. Disk energy can’t recognize or fix all difficulties that a disk might have.

To check and also repair a disk, you have to run very first Aid on each volume and also container on the storage device in turn, then run it on the storage maker itself.

If Disk energy tells friend the disk is around to fail, ago up her data and also replace the disk—you can not repair it.

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In the sidebar, pick a volume, then click the first Aid button .

In the very first Aid dialog, click Run, climate follow the onscreen instructions.

When the an initial Aid procedure is complete, click Done.

Repeat actions 2 through 4 because that each volume ~ above the storage device.

In the sidebar, select a container, then click the first Aid switch .

In the an initial Aid dialog, click Run, then follow the onscreen instructions.

When the first Aid procedure is complete, click Done.

Repeat steps 6 through 8 because that each container on the storage device.

In the sidebar, select the warehouse device, climate click the first Aid switch .

In the an initial Aid dialog, click Run, climate follow the onscreen instructions.

When the first Aid procedure is complete, click Done.


If Disk utility reports the the disk shows up to be OK or has been repaired, you’re done. You can click present Details come see much more information around the repairs. Otherwise, you might need to do among the following.

If Disk utility reports “overlapped level allocation” errors, 2 or much more files accounting the same room on her disk, and at the very least one of castle is likely to it is in corrupted. You require to check each file in the list of affected files. Most of the papers in the list have aliases in a DamagedFiles folder at the top level of your disk.

If you have the right to replace a record or re-create it, delete it.

If it contains information friend need, open it and examine that data to make sure it hasn’t to be corrupted.

If Disk energy can’t repair your disk, or you obtain a report that the very first Aid process failed, shot to repair the disk or partition again. If the doesn’t work, earlier up as lot of her data as possible, reformat the disk, reinstall macOS, then gain back your backed-up data.

If your Mac has actually a blend Drive and also you view a flashing question mark or alert, view the troubleshooting ar of the apologize allisonbrookephotography.com write-up About blend Drive, a storage option for some Mac computers.

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If you continue to have difficulties with her disk or it can not be repaired, it might be physically damaged and need to be replaced. For information about servicing her Mac, see discover out just how to business or repair your Mac.


See alsoErase and reformat a storage maker in Disk utility on MacAdd, delete, or erase APFS quantities in Disk utility on MacPartition a physics disk in Disk energy on Macallisonbrookephotography.com allisonbrookephotography.com article: exactly how to repair a Mac disk with Disk Utility