can't unmount disk mac Typically the 'Couldn't Unmount Disk' error pops up when the currently boot drive is being modified, thus disk erase failed with the error couldn't unmount disk the easiest solution is to boot from another drive and run Disk Utility from there instead. This can happen during partitioning, disk verification and repair, and even during formatting, and there's usually little to no additional information provided as to how to resolve the problem or even what the problem is.
Halt whatever the attempted task is right in its tracks. Mac Os X Disk Utility Error Could Not Unmount Disk
