Attach the USB boot drive to the Mac and reboot Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu) At the boot menu, choose “Disk Utility” (if using an Installer disk, pull down the “Utilities” menu to access Disk Utility). Part 2 - 4 methods to fix 'Couldn't Unmount Disk' on mac Method 1: Right Steps to Unmount Volume for Repair on Disk Utility. The simplest solution to unmount volume for repair. Method 2: Fix with a USB boot drive. If you're struggling with the 'Couldn't Unmount Disk' error, the way to fix this. You should replace /Volumes/Macintosh HD with the name of your fusion drive before you run that command. Once the drive is unmounted you can format it like so: sudo diskutil reformat /dev/disk2. You should replace /dev/disk2 in the above command with whatever your disk number is for your fusion drive. Question: Q: Unable to Unmount Volume for Repair I have been using a WD My Passport for Mac 1 TB external hard drive to store photos and lightroom catalogue. Yesterday I had problems with the catalogue and am unable to copy all the files to another external hard drive as there were faults noted.
- Mac Usb Unable To Unmount Volume For Repair Parts
- Mac Usb Unable To Unmount Volume For Repair Disk
- Mac Usb Unable To Unmount Volume For Repair Mac
Thank you for using Apple Support Communities. It seems like you want to repair your external drive but it is giving you an error that it is not able to unmount and repair. I would recommend you read this article and use it to help troubleshoot the issue.
If you try to verify a volume that is not your startup disk but for some reason Disk Utility can't unmount the volume (for example, the disk may have open files), the verification will appear to start but then stop without displaying any alert message. If you look in the Console (/Applications/Utilities/), you will see an entry like this:
Verifying volume “Storage” The disk “Storage” could not be unmounted Could not unmount disk for verification, attempting live verify
If you try to repair a disk that cannot be unmounted, the repair will appear to start, but then stop as Disk Utility displays this message: 'Repairing disk failed with error. Could not unmount disk.'
If you look in the Console (/Applications/Utilities/), you will see an entry like this:
Verify and Repair disk 'Storage.' The disk “Storage” could not be unmounted. Could not unmount disk for verification. Repairing disk failed with error. Could not unmount disk.
Mac Usb Unable To Unmount Volume For Repair Parts
In some rare situations, your computer might not respond for several seconds.
If you cannot determine which files are open on the disk that you want to verify or repair, restart your computer and then mount the disk again, or start up from your Mac OS X Install DVD or CD to repair.
Using Disk Utility to verify or repair disks
Take care.
Mac Usb Unable To Unmount Volume For Repair Disk
Jan 31, 2017 1:38 PM
Mac Usb Unable To Unmount Volume For Repair Mac
KAINARC now appears on my desktop, but the partition of JUNGLEMAC does not. I go to disk utility and both partitions are visable, KAINARC is mounted but JUNGLEMAC is not. I cannot mount JUNGLEMAC.
When i try to verify and repair the partition I get the message:
Verify and Repair disk JUNGLEMAC
Error: The underlying task reported failure on exit
1 non HFS volume checked
1 volume could not be repaired because of an error
So I try to verify and repair the partition KAINARC but get this message:
Verify and Repair disk KAINARC
Repairing disk failed with error Could not unmount disk
So I have opened diskwarrior (unbelievably long time to start up and scan disks) in the hope of fixing the hard drive, but when i try to repair I get the error message 'unable to unmount KAINARC'.
I have tried other repair/recover programs but get the same message: 'Could not unmount disk KAINARC'
Im asuming that to fix the hard drive it has to be able to unmount KAINARC.
Does anyone have any ideas of how I can fix this problem. I would normally reformat but I have a lot of stuff on the hard drive that I dont wont to lose.
chrisjay2001