sshark@aurora:~$ sudo mount /media/cdrom0/
mount: block device /dev/scd0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/scd0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
shark@aurora:~$ dmesg | tail
[ 9073.874637] attempt to access beyond end of device
[ 9073.874640] sr0: rw=0, want=689220, limit=4
[ 9073.874647] attempt to access beyond end of device
[ 9073.874651] sr0: rw=0, want=1252, limit=4
[ 9073.874657] attempt to access beyond end of device
[ 9073.874662] sr0: rw=0, want=1028, limit=4
[ 9073.874666] UDF-fs: No partition found (1)
[ 9073.874849] attempt to access beyond end of device
[ 9073.874853] sr0: rw=0, want=68, limit=4
[ 9073.874859] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
shark@aurora:~$