I can read DVD but not CD on FC2

[ldeschaumes at free.fr]

I don't understand

when i do mount /mnt/cdrom with a CD i have this error
isofs_read _super:bread failed,dev16:00, iso_blknum=16, block=32
mount: type fs incorrect ......
but no problem with a DVD

my fstab
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot        /boot                   ext3    defaults        1 2
none               /dev/pts                devpts  gid=5,mode=620  0 0
none               /proc                   proc    defaults        0 0
none               /dev/shm                tmpfs   defaults        0 0
/dev/hda3          swap                    swap    defaults        0 0
/dev/cdrom        /mnt/cdrom              udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/fd0          /mnt/floppy             auto    noauto,owner,kudzu 0 0

i need help

tks
Laurent