Something like
apt-get install lsof
lsof +D /cdrom
will show you the processes holding the device busy.
The following will kill all those processes (for which you have the
permission):
kill `lsof +D /cdrom -t`; kill -HUP `lsof +D /cdrom -t`; sleep 10;
kill -9 `lsof +D /cdrom -t`
(Not tested since I do not have a cdrom around)
Gui unmount programs should (and maybe some even do?) have nicer
handling, i.e. show the user the processes having open files on the
device and asking whether they should kill those processes.
Christian.
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