My Samsung drive failed on me, at first I thought it was the enclosure but a direct SATA connection causes the same problems for discs that are inserted.  It will work fine for a few minutes but then starts spewing the errors below.

I've never been a fan of Korean made optical drives and have always had trouble with them.  The problem is that I don't believe NEC and Lite-ON make drives anymore, and I considered them the leaders.

Apr  7 11:58:48 box kernel: [71534.740594] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 04 00 00 00 02 00
Apr  7 11:58:48 box kernel: [71534.763443] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 11:58:48 box kernel: [71534.763454] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
Apr  7 11:58:48 box kernel: [71534.763464] sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range
Apr  7 11:58:48 box kernel: [71534.763474] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Apr  7 11:58:48 box kernel: [71534.765714] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 11:58:48 box kernel: [71534.765725] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
Apr  7 11:58:48 box kernel: [71534.765734] sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range
Apr  7 11:58:48 box kernel: [71534.765745] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Apr  7 11:58:48 box kernel: [71534.785779] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 11:58:48 box kernel: [71534.785790] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
Apr  7 11:58:48 box kernel: [71534.785800] sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range
Apr  7 11:58:48 box kernel: [71534.785811] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 01 00
Apr  7 11:58:48 box kernel: [71534.787761] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 11:58:48 box kernel: [71534.787772] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
Apr  7 11:58:48 box kernel: [71534.787782] sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range
Apr  7 11:58:48 box kernel: [71534.787792] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 01 00 00 01 00
Apr  7 11:58:48 box kernel: [71534.789910] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 11:58:48 box kernel: [71534.789921] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
Apr  7 11:58:48 box kernel: [71534.789931] sr 1:0:0:0: [sr0] Add. Sense: Logical block address out of range
Apr  7 11:58:48 box kernel: [71534.789942] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Apr  7 12:10:38 box kernel: [72245.143338] sr 1:0:0:0: [sr0] Unhandled sense code
Apr  7 12:10:38 box kernel: [72245.143347] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 12:10:38 box kernel: [72245.143356] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr  7 12:10:38 box kernel: [72245.143367] sr 1:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Apr  7 12:10:38 box kernel: [72245.143378] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 6a 50 00 00 02 00
Apr  7 12:10:38 box kernel: [72245.144761] __ratelimit: 506 callbacks suppressed
Apr  7 12:10:43 box kernel: [72249.989290] sr 1:0:0:0: [sr0] Unhandled sense code
Apr  7 12:10:43 box kernel: [72249.989299] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 12:10:43 box kernel: [72249.989308] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr  7 12:10:43 box kernel: [72249.989319] sr 1:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Apr  7 12:10:43 box kernel: [72249.989329] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 6a 50 00 00 02 00
Apr  7 12:10:48 box kernel: [72254.834402] sr 1:0:0:0: [sr0] Unhandled sense code
Apr  7 12:10:48 box kernel: [72254.834412] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 12:10:48 box kernel: [72254.834421] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr  7 12:10:48 box kernel: [72254.834432] sr 1:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Apr  7 12:10:48 box kernel: [72254.834442] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 6a 50 00 00 02 00
Apr  7 12:10:53 box kernel: [72259.755456] sr 1:0:0:0: [sr0] Unhandled sense code
Apr  7 12:10:53 box kernel: [72259.755465] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  7 12:10:53 box kernel: [72259.755475] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
Apr  7 12:10:53 box kernel: [72259.755485] sr 1:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Apr  7 12:10:53 box kernel: [72259.755496] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 6a 50 00 00 02 00