Your DVD drive seems to be hdd based off your 'dmesg' file that was attached. It also seems that it may be having some hardware problems as indicated by:
"[17179605.940000] end_request: I/O error, dev hdd, sector 786432 [17179605.988000] hdd: command error: status=0x51 { DriveReady SeekComplete Error } [17179605.988000] hdd: command error: error=0x50 { LastFailedSense=0x05 }"
Your DVD drive seems to be hdd based off your 'dmesg' file that was attached. It also seems that it may be having some hardware problems as indicated by:
"[17179605.940000] end_request: I/O error, dev hdd, sector 786432 =0x05 }"
[17179605.988000] hdd: command error: status=0x51 { DriveReady SeekComplete Error }
[17179605.988000] hdd: command error: error=0x50 { LastFailedSense