Hi. I'm having a problem where my laptop dvd drive does not recognizes data dvds burned by itself. I'm having to use a external dvd drive to read my dvds. This is absolutely weird because my laptop drive records just fine. Using xubuntu 12.04. Ubuntu had the same problem.

dmesg | grep "sr0"
[12331.669921] sr 2:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[12331.669929] sr 2:0:0:0: [sr0] Sense Key : Medium Error [current]
[12331.669939] sr 2:0:0:0: [sr0] Add. Sense: Cannot read medium - unknown format
[12331.669951] sr 2:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
[12331.669972] end_request: I/O error, dev sr0, sector 0