Can't unmount the disk during Mac OS X install. Ask Question Asked 7 years, 10 months ago. And was trying to reinstall the OS, so I'd say that he was unable to unmount the drive when booted from a DVD. – daviewales Dec 3 '12 at 10:12. Repair MBR (Windows 10) from OS X. OS X can't unmount disk. Actually I think the reasons are different: here probably a degraded hdd, there a wrong EFI size and therefore an unreadable or partly overwritten HFS+ volume. The symptoms (unable to unmount) and the solution (force unmount) are probably the same though. – klanomath Mar 25 '15 at 17:02. Unmount the disk. Unmount the disk called /dev/disk2: $ diskutil unmountDisk /dev/disk2 Sample outputs: Unmount of all volumes on disk2 was successful 3. Create the disk image with dd. Finally create the disk image of the entire disk /dev/disk2: $ sudo dd if=/dev/disk2 of=backup.my.sdcard-18-oct-2015.img.dd bs=512 OR.
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.
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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.
Mac Os X Disk Utility Unable To Unmount Volume For Repair
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 Os X 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
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