4/16/09
8:31 am

Unmounting a Stuck Disk

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.

Comments: 5 Responses to “Unmounting a Stuck Disk”

    Hugo
    5/5/09 @ 11:45 am

    Cheers for that!

    ctrlzones
    3/10/10 @ 7:56 pm

    and it works. cool. no more violent ejections.

    Virginia O'Connor
    9/4/10 @ 8:11 pm

    Awesome tip, worked like a charm – thanks!

    Shawn
    5/15/12 @ 6:40 am

    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.

      5/15/12 @ 6:46 am

      Hard to say. Experiment. Or, just restart.

Comments Closed.