Чтение CD extra

Как смотреть данные на диске "CD extra"? При попытке монтирования выдается:
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 other error
In some cases useful info is found in syslog - try
dmesg | tail or so

dmesg | tail выводит, хотя вряд ли это важно, вот что:
[39700.311321] ata1: EH complete
[39700.312319] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
[39700.314102] SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
[39700.314816] sda: Write Protect is off
[39700.314821] sda: Mode Sense: 00 3a 00 00
[39700.323224] SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[39700.324365] SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
[39700.324925] sda: Write Protect is off
[39700.324929] sda: Mode Sense: 00 3a 00 00
[39700.334056] SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Ubuntu 7.04