If you ever get a disk or disk image that will not unmount, you can force it with a Terminal command. Run Terminal and use “df” to list the drives. Find the one you want to unmount, such as /dev/disk3s2. Then use “diskutil unmountDisk force /dev/disk3s2” to force it to unmount.
Unmounting a Stuck Disk
Comments: 5 Responses to “Unmounting a Stuck Disk”
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Cheers for that!
and it works. cool. no more violent ejections.
Awesome tip, worked like a charm - thanks!
What if the terminal returns a "at least one volume could not be unmounted"? I came across this as I tried to use this approach to get my external hard drive to unmount. Any suggestions would be appreciated.
Hard to say. Experiment. Or, just restart.