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Supports Mac OS X 10.9 through 10.15 Fully localized in French, thanks to Ronald A. View the FAQ that is also available in the app under the Help menu. Note: SMART Utility is based on the command line “smartmontools”, an open source software package that does the actual scanning of SMART attributes.
Disk Utility User Guide
Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.
If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.
In the Disk Utility app on your Mac, choose View > Show All Devices.
Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).
In the sidebar, select a disk or volume, then click the First Aid button .
If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
Click Run, then click Continue.
If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.
If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
If you can replace a file or re-create it, delete it.
If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
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If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.
If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.
Disk Utility User Guide
You can see detailed information about a disk or volume on your Mac, including:
Location of disk or volume (internal or external)
Format being used
Total capacity
Amount of space available, which can include both free space and “purgeable space”—or space that macOS can free up when needed by removing files from your computer. You can’t manually remove the files that are designated purgeable, but macOS removes them as space is required.
Where the volume is mounted
Number of folders and files the disk contains
Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.) status, which is the disk’s general working condition
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Logical volume group disk
When you create a logical volume partition from a logical volume group using diskutil, the Available and Used report information in Disk Utility is determined by the storage space used by the logical volume partition you created. For example, if you create a logical volume partition of 400 GB from a logical volume group of 1 TB, the 400 GB storage space used to create the logical volume partition is reported in Disk Utility as Used space, and the remaining 600 GB is reported as Available space for the logical volume group. When you select the 400 GB logical volume partition, the information reported for Used, Purgeable, and Free is determined by the amount of data in the logical volume partition.
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In the Disk Utility app on your Mac, choose View > Show All Devices.
Select a disk or volume, then click the Info button .