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.
# 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!
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