ошибка dvd

Error mounting system-managed device /dev/sr0: Command-line `mount "/mnt/ata-Optiarc_DVD_RW_AD-7740H"' exited with non-zero exit status 32: mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

что делать подскажите