cd seen as blank cd

[Thierry Chatelet <tchatelet@free.fr>]

Hi,
On a new Etch-amd64 install, when I load a cd in the drive, it is seen as 
blank cd. Now, say I take a debian install cd, it is seen at boot, and I can 
start the instalation ( I stopped before formating, I would rather not 
re-install). In fstab, I have:
/dev/hda        /media/cdrom0   udf,iso9660 user,noauto     0       0

Any ideas?
Thanks