How to unmount external/eject drives? Sometimes we get a disk or disk image stuck and not gets eject even after restarting the Mac holding down the mouse button. If that does not unmounts, you can force it with a Terminal command. In order to do thid, launch Terminal and use “ df ” to list the drives. Search and locate the drive that you want to unmount, such as /dev/disk3al. Then run command “ diskutil unmountDisk force /dev/disk3al ″ this should force it to unmount. Make sure you try this command after making sure that you have pointed the correct drive.
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