I am seeing this problem across multiple data dvd's.  I am on 2.6.27-9-generic. 
 Dmesg is as follows:
[29630.087270] cdrom: This disc doesn't have any tracks I recognize!
[32055.556162] UDF-fs: No VRS found
[32055.570806] ISO 9660 Extensions: Microsoft Joliet Level 3
[32055.573772] ISOFS: changing to secondary root
[32575.051317] attempt to access beyond end of device
[32575.051324] sr0: rw=0, want=68, limit=4
[32577.621253] attempt to access beyond end of device
[32577.621263] sr0: rw=0, want=1028, limit=4
[32577.621271] attempt to access beyond end of device
[32577.621273] sr0: rw=0, want=2052, limit=4
[32577.621277] UDF-fs: No partition found (1)
[32578.392434] attempt to access beyond end of device
[32578.392441] sr0: rw=0, want=68, limit=4
[32578.392444] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
[33092.960510] attempt to access beyond end of device
[33092.960518] sr0: rw=0, want=68, limit=4
[33095.539843] attempt to access beyond end of device
[33095.539852] sr0: rw=0, want=1028, limit=4
[33095.539859] attempt to access beyond end of device
[33095.539861] sr0: rw=0, want=2052, limit=4
[33095.539866] UDF-fs: No partition found (1)
[33095.550610] attempt to access beyond end of device
[33095.550616] sr0: rw=0, want=68, limit=4
[33095.550619] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16

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mounting dvd says: block device is write protected
https://bugs.launchpad.net/bugs/244445
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