It happens all the time doesnât 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 âdevice is busyâ message. Wouldnât it be great if Linux actually told you what was keeping the drive busy? Here we are in 2008, Iâm using Ubuntu Gutsy, and that message hasnât changed in all the years Iâve used Linux.
# umount /media/disk/
umount: /media/disk: device is busy
umount: /media/disk: device is busy
First thing youâll do will probably be to close down all your terminals and xterms but hereâs 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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from :Â http://ocaoimh.ie/how-to-umount-when-the-device-is-busy/
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from :Â Â http://hi.baidu.com/carbens/blog/item/f10f8288b8743190a4c272fe.html