(where /mnt/cdrom is the mount point for the CD)
if you get some numbers, those numbers are the process who are using the CD unit...
issue a "ps -ef | grep xxxx" where xxxx is one of the numbers returned from fuser command. Kill those process and you will can umount the CD.
Make sure that you're not cd'd into the directory that you want to umount, also if you have used pfs_mount, you must use pfs_umount, or you'll end up with a stale nfs handle message and reboot will be the only option.
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