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.
Input diskutil list line. When the list of all disks appears you need to found the disk that you want to force unmount. Type sudo diskutil unmountDisk force /dev/diskx line. Replace /dev/diskx with correct disk number. Follow with steps further to forcibly unmount the disk from your Mac. In the Disk Utility app on your Mac, select the disk set that you want to unmount in the sidebar. Click the Unmount button in the toolbar or beside the disk set name. After unmounting a disk set, you can disconnect the disk members of the set from your computer.
Mac Disk Utility Unable To Unmount Volume For Repair Parts
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.
Click the Unmount button in the toolbar or beside the disk set name. Disconnect the disk member that you want to unmount. If you unmount and disconnect a disk and then reconnect the disk later, Disk Utility rebuilds the disk member automatically if you selected “Automatically rebuild” when creating the disk set. Oct 23, 2017 the solution for drives with open files is to do a restart and do not re-open old Applications. The solution for the boot drive is to use RecoveryHD as the 'place to stand' and run the version of Disk Utility from there. (this means you are no longer booted from the Mac OS X partition, and the regular boot Volume is then free for full repair.).
Mac Disk Utility Unable To Unmount Volume For Repair
- 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.
Mac Disk Utility Unable To Unmount Volume For Repair Iphone
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.
Mac Disk Utility Unable To Unmount Volume For Repair Service
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