#Mac os x unable to unmount volume for repair mac os x#
For backup, you can either use in-built Mac software like Time Machine or 3rd party tools like Stellar Drive Clone, Carbon Copy Cloner, etc.ĭo a last minute ditch repair, by booting your Mac OS X before the Apple logo will appear by holding down the Cmd+S button from your keyboard. So, if you are facing this issue, then try below mentioned few tricks: -īefore you do anything, makes sure you have proper Mac backup available on an external drive, which can come handy in case of data loss situation. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.” Is one of the most common error which occur when you use Disk Utility in a bid to solve a problem and Disk Utility has shrugged its shoulders and given up. In Mac there are several errors which is difficult to cumbersome whenever they encounter and “Error: Disk Utility can’t repair this disk.
I let it do it's thing for a few hours when it was done, the disk was automatically remounted and could be browsed in Finder. In my case, my external drive (which I use for Time Machine backups) was given the name "/dev/disk4s4", and indeed the filesystem check program (fsck_hfs) command was still running. To see whether this is the case, you can run the "process status" command in a Console shell: Macbook-Pro: ~ luthien$ sudo ps ax | grep hfsĦ05 ? R 4:08.59 /System/Library/Filesystems/hfs.fs/Contents/Resources/./fsck_hfs -y /dev/disk4s4 If the external drive's activity indicator is blinking, but you are otherwise unable to access the drive, then some background process is working on your disk. Your Mac will not be able to mount the disk until after the automatic checks are complete. If you receive this message from Disk Utility after replugging an external drive that wasn't successfully ejected (or unmounted), it could be that the OS is already busy performing the repair in the background.
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