Reusing the cdrom drive

Hello,

I have backups on cdr, and want to restore them under LNX-BBC. However, after
booting LNX-BBC the cdrom cannot be unmounted, as it says its busy. I can't see which
process has the cdrom open (did an lsof). I even tried to kill a couple of the
processes, to see if that makes a difference. Most of the utilities I want are
in the ram drive (I think), so I don't think I need to run stuff off the LNX-BBC
cdrom when accessing my cd.

Anyone any ideas how I can unmount the LNX-BBC cdrom, and swap if for one of my
backup cds? If if its a case that I can't use LNX-BBC after swapping the cds,
then I can always reboot LNX-BBC again. I'm just using LNX-BBC for hard disk
recovery.

Many thanks in advance.

-- 
Best regards,
Alastair Munro