[NCLUG] umount cdrom when it says busy

[paul hansen]

Hey,

How can I force umount of /mnt/cdrom when it tells me the device is
busy? No, I'm no longer in /mnt/cdrom. I remember someone showing me how
to do something in /proc, but I can't remember what we did (2 years ago).

Also, umount -f doesn't work.

thanks,

   Paul