If that’s not the case, this fix is worth trying, here’s how to resolve the error with the recovery partition: Mind you, this fix will not work if the error was caused by modifying the bootable disk while creating a partition or formating. Fix “Couldn’t Unmount Disk” Error with Recovery Partition Let there be any Mac OS X version as it doesn’t matter (assuming 10.7 to 10.14 and above), this error can be easily resolved only if Disk utility is present on the drive.Īnyways, let’s head towards the actual fixes. Keeping the fact in mind that Disk Utility able to execute from the external drive, we can use it to boot Mac from another bootable drive. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one of the force eject methods.SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it. You can mount and unmount drives, volumes, and disks from the command line of MacOS and Mac OS X. And was trying to reinstall the OS, so I'd say that he was unable to unmount the drive when booted from a DVD. Ask Question Asked 7 years, 10 months ago. Can't unmount the disk during Mac OS X install. It is formatted as Mac OS Extended (Journaled). I only use the WD drive for Time Machine. Click Repair Disk', but when I do click repair I get 'Error: Unable to unmount volume for repair' I am unable to copy any documents to the WD drive, as I get a message telling me that they are in use. Mac OS X comes with an easy-to-use application, called Disk Utility, that allows users to verify and repair hard disks using a graphical user interface and it is recommended for most Mac users that are not comfortable using the terminal. How to Repair a Disk on Mac OS X from Command Line.
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