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!
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Naill, Thank you for the advice
the “umount -l /mnt/sdb1” woked nicely 
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As they, say use
fuser -vm /dev/sdc1