My CDROM is mounted by ?

[David selby <debian@pusspaws.net>]

This is probarbly an old chestnut but,

How can I find out what has a mount on my DVD player.

I have been mounting my DVD, /mount /CDROM/ reading DVDs.
I tried to /umount /cdrom, "device busy"/ I shut down all my programs, 
just KDE running, /"device busy".
/Had to resort to drastic action, re-booted system

Im sure there is a better way ?

Dave