Have you tried using fuser to find out what's accessing it?  If your CD-ROM
is /dev/hdc, just run fuser /dev/hdc to see the PID of every process using
that device.  You can also do fuser -k /dev/hdc to kill whichever processes
are accessing the device.

~Jeff

On Tuesday, September 25, 2001, Carl Parrish wrote:

> Okay whenever I try to umount my cdrom drive it tell me devise is busy 
> (despite the fact that I can't see anything using it). Is there anyway I 
> can force it to umount anyway or kill whatever is using it (how would I 
> find that out?). yes I've tried umount - f.
> 
> Carl P.