The “Couldn’t Unmount Disk” error can happen during formatting, partitioning, disk verification and repair, or any task that the Disk Utility undertakes. What is the “Couldn’t Unmount Disk” Error on Mac? When this error pops up, any attempted task gets stopped right in its tracks.
One of the common errors encountered when using Disk Utility is the “Couldn’t Unmount Disk” error. Disk Utility will check the health of your hard drive and repair any disk errors if possible.ĭisk Utility usually works smoothly, but there are times when frustrating errors occur and prevent the process from being completed. For example, you can run a disk check when your apps quit simultaneously, an external drive is not working properly, or your Mac won’t startup. The Disk Utility on Mac is a very useful system tool for fixing specific disk problems.
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