mount cdrom error

mount /media/cdrom0

mount: wrong fs type, bad option, bad superblock on /dev/hdc,
      missing codepage or other error
      In some cases useful info is found in syslog - try
      dmesg | tail  or so

# /etc/fstab: static file system information.
#
# <file system> <mount point>  <type>  <options>      <dump>  <pass>
proc            /proc          proc    defaults        0      0
/dev/hda1      /              ext3    defaults,errors=remount-ro 0      1
/dev/hda5      none            swap    sw              0      0
/dev/hdc        /media/cdrom0  iso9660 ro,user,noauto  0      0
/dev/fd0        /media/floppy0  auto    rw,user,noauto  0      0

Hvis jeg tager cden ud skriver den:

mount: No medium found

Hvad kan være galt?