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- Repair a storage device in Disk Utility on Mac. 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.
- That allows you to run Disk Utility, reinstall or wipe and install the system, access Terminal for command-line functions, and so on. Mac 911 can’t reply to—nor publish an answer to.
- Disk1s1, the volume you boot from, mounted at /, shown in Disk Utility as Macintosh HD; disk1s2, ‘Preboot’, not mounted, hidden; disk1s3, ‘Recovery’, not mounted, hidden; disk1s4, ‘VM’, mounted at /private/var/vm, hidden; The last 3 are grouped as Other Volumes in Disk Utility. They're required by macOS and shouldn't be removed.
Disk Utility User Guide
If you’re having problems with a disk, Disk Utility can check the disk and repair problems it detects. How to repair a disk To browse the Disk Utility User Guide, click Table of Contents at the top of the page.
Disk Utility On Macbook
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.
Disk Utility For Mac Os 10
- 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.
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 for macbook air Disk utility for macbook air](/uploads/1/1/7/7/117749652/882793587.jpg)
See alsoErase and reformat a storage device in Disk Utility on MacAdd, delete, or erase APFS volumes in Disk Utility on MacPartition a physical disk in Disk Utility on Mac
Disk Utility User Guide
You can use Disk Utility on your Mac to manage internal disks and external storage devices. Using Disk Utility, you can:
Disk App For Mac
![Disk Utility For Mac Disk Utility For Mac](/uploads/1/1/7/7/117749652/193912444.png)
- Format and manage volumes on physical storage devices.
- Create a disk image, a single file you can use to move files from one computer to another or to back up and archive your work.
- Combine multiple hard disks into a RAID set that acts as a single disk. Using multiple hard disks in a RAID set can increase the performance, reliability, and storage capacity of your data storage system, depending on the type of set you choose.
- Check for and repair errors on your disks and volumes.
Disk Utility For Mac
See alsoAdd, delete, or erase APFS volumes in Disk Utility on MacFile system formats available in Disk Utility on MacGet detailed information about a disk in Disk Utility on MacRepair a storage device in Disk Utility on MacErase and reformat a storage device in Disk Utility on Mac