The following message is shown at the tty1 when X-window is starting:

hda: dma_intr: status=0x51 { DriveReady SeekComplete Error}
hda: dma_intr: error=0x40 { UncorrectableError}, LBAsect=1686256, hig=0, low=1686256, sector=1686255
ide: failed opcode was: unknown
end_request: I/) error, dev hda, sector 1686255

What does that mean? Thansk!