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![]() #Format wd passport for mac couldnt unmount disk mac os#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. #Format wd passport for mac couldnt unmount disk how to#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. #Format wd passport for mac couldnt unmount disk mac os x#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.
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