![]() When the device is not allowed to repair specific permissions or directories in Disk utility, then might popup this error message on your Mac screen. ![]() ![]() When a device cannot erase or partition the drive, users are delivered Couldn’t Unmount Disk error or related messages.Reasons behind Couldn’t Unmount Disk Error on Mac Procedure 3: To fix couldn’t Unmount Disk error Mac, you can check USB Boot Drive.Procedure 2: You can use Recovery Partition.Procedure 1: fix couldn’t Unmount Disk error by using command line.Ways to Fix Couldn’t Unmount Disk Mac: Tips & Tricks.Reasons behind Couldn’t Unmount Disk Error on Mac.
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