Confirming this issue on Ubuntu 7.04 (Feisty Fawn).
/var/log/messages shows: Unable to identify CD-ROM format.
/etc/fstab entry: /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0
mount /dev/scd0 /media/cdrom0/ -t udf works fine.
Confirming this issue on Ubuntu 7.04 (Feisty Fawn).
/var/log/messages shows:
Unable to identify CD-ROM format.
/etc/fstab entry:
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0
mount /dev/scd0 /media/cdrom0/ -t udf
works fine.