![]() In that case, you’ll need to boot from a separate USB drive to fix the error. Go to “First Aid” to verify and repair the disk, or go to “Erase” to format the diskĪgain, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above method may not work to resolve the problem.Select “Disk Utility” from the boot menu.Reboot the Mac holding down the “Option” key and choose the Recovery partition.This will not work if the error was triggered by attempting to modify the boot disk through partitions or formatting, and you will need to use the method above with a boot disk instead. If the Unable to Unmount Error is triggered by first aid or formatting a non-boot partition, you may be able to fix the error by booting from the Recovery partition that is included with all new versions of Mac OS X. How to Fix Disk Utility Errors via Mac Recovery Partition For older Macs running prior versions of Mac OS X, typically anything running OS X 10.6 or earlier will have a SuperDrive, and thus shipped with a bootable DVD that can serve this same purpose. ![]() Such boot drives are easy to create on your own, here are instructions for making boot disks for OS X 10.9, OS X 10.8, and OS X 10.7. This is a good example of why it’s very valuable to have a bootable USB thumb drive set up with whatever version of Mac OS X is running on your Macs, because without a separate boot drive some of these errors would be unresolvable. The above steps did the trick and everything was working again as expected. I ran into this twice recently, first when attempting to modify partitions on a drive, which came right along with a separate “ partition failed” error, and again was triggered when attempting to format those partitions. Now perform the original task that threw the “Couldn’t Unmount” error.Go to “First Aid” and verify the disk, then repair if needed.At the boot menu, choose “Disk Utility” (if using an Installer disk, pull down the “Utilities” menu to access Disk Utility).Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu). ![]()
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