I have knoppix 3.4 (booting from hd). I cannot mount the cd.

When booting, knoppix tell me:
...
mount: fs type deves not supported by kernel
unmount: devfs: not mounted
...


On fstab:
# /etc/fstab: filesystem table.
#
# filesystem mountpoint type options dump pass
/dev/hda4 / ext3 defaults,errors=remount-ro 0 1

proc /proc proc defaults 0 0
/dev/fd0 /floppy vfat defaults,user,noauto,showexec,umask=022 0 0
usbdevfs /proc/bus/usb usbdevfs defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/cdrom /cdrom iso9660 defaults,ro,user,noexec,noauto 0 0
/dev/dvd /dvd iso9660 defaults,ro,user,noexec,noauto 0 0
/dev/cdaudio /cdaudio iso9660 defaults,ro,user,noexec,noauto 0 0
# Added by KNOPPIX
/dev/hda1 /mnt/hda1 vfat noauto,users,exec,umask=000 0 0
# Added by KNOPPIX
/dev/hda2 /mnt/hda2 vfat noauto,users,exec,umask=000 0 0
# Added by KNOPPIX
/dev/hda5 /mnt/hda5 vfat noauto,users,exec,umask=000 0 0
# Added by KNOPPIX
/dev/hda6 /mnt/hda6 ext3 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda7 none swap defaults 0 0

I have the icon on KDE, but does not show mount option like for the hd.
I try to put a cd, but nothing happen...
If I click on the icon, knoppix says me: file:/mnt/cdrom does not exist.

In /mnt I found cdrom as unknow link, I try to delete it, but nothing happen...
I try to mount by hand, but nothing happen

...any clue? I don't have any idea about what to do! Help!

Thank you!
Rosso39