M.I.T = Multimedia IT dept.

http://ocaoimh.ie/how-to-umount-when-the-device-is-busy/

It happens all the time doesn’t it? You need to unmount a CD or you want to
pack away the external drive but when you try to umount it you get the
dreaded “device is busy” message. Wouldn’t it be great if Linux actually
told you what was keeping the drive busy? Here we are in 2008, I’m using
Ubuntu Gutsy, and that message hasn’t changed in all the years I’ve used
Linux.

# umount /media/disk/
umount: /media/disk: device is busy
umount: /media/disk: device is busy

First thing you’ll do will probably be to close down all your terminals and
xterms but here’s a better way. You can use the fuser command to find out
which process was keeping the device busy:

# fuser -m /dev/sdc1
/dev/sdc1: 538
# ps auxw|grep 538
donncha 538 0.4 2.7 219212 56792 ? SLl Feb11 11:25 rhythmbox

Rhythmbox is the culprit! Close that down and umount the drive.Problem
solved!