Unmounting a disk means disconnecting a disk drive or optical disk from the computer.To know about the solutions, first, let's understand about unmounting and disk utility, and the causes of the disk error. Part 1- What does 'couldn't unmount disk' mean? Part 4 - Learn, 'How to Use Disk Utility?'.Part 3 - Recover lost files on Mac after all methods fail.Part 2 - 4 methods to fix 'Couldn't Unmount Disk' on Mac.Part 1 - What does' couldn't unmount disk mean?.
