Optiarc DVD RW AD-7170A dma fails

После записи диска по неизвестным причинам отключается поддержка dma, несмотря
на установленный флаг keepsettings, хотя привод работает нормально. В чём
проблема и где искать решение?
kernel: 2.6.18
Ниже выдержка из вывода dmesg:

hdc: irq timeout: status=0xd0 { Busy }
ide: failed opcode was: unknown
hdc: DMA disabled
hdc: ATAPI reset complete
hdc: tray open
end_request: I/O error, dev hdc, sector 6098720
Buffer I/O error on device hdc, logical block 1524680
Buffer I/O error on device hdc, logical block 1524681
Buffer I/O error on device hdc, logical block 1524682
Buffer I/O error on device hdc, logical block 1524683
Buffer I/O error on device hdc, logical block 1524684
Buffer I/O error on device hdc, logical block 1524685
Buffer I/O error on device hdc, logical block 1524686
Buffer I/O error on device hdc, logical block 1524687
Buffer I/O error on device hdc, logical block 1524688
Buffer I/O error on device hdc, logical block 1524689
hdc: tray open
end_request: I/O error, dev hdc, sector 6098976
hdc: tray open
end_request: I/O error, dev hdc, sector 6098720
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root
hdc: packet command error: status=0x51 { DriveReady SeekComplete Error }
hdc: packet command error: error=0x54 { AbortedCommand LastFailedSense=0x05 }
ide: failed opcode was: unknown
ATAPI device hdc:
Error: Illegal request -- (Sense key=0x05)
Cannot read medium - incompatible format -- (asc=0x30, ascq=0x02)
The failed "Read Subchannel" packet command was:
"42 02 40 01 00 00 00 00 10 00 00 00 00 00 00 00 "