As detailed at if you have an external drive that you’ve right-clicked on your desktop and clicked ‘Unmount’ or ‘Eject’ but it says “An application is preventing the volume ‘(name)’ from being unmounted.”, there is a way to figure it out.


This will list your drives to see what the device name is. Now:

fuser -m /dev/devicename

Now you know what you need to fiddle with to get it to eject!