Posted by Gary Rosenzweig on 4/16/09.
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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.
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Cheers for that!