johanna@Aurora:~$ dmesg | tail -n 20
hda: media error (bad sector): status=0x51 { DriveReady SeekComplete Error }
hda: media error (bad sector): error=0x30 { LastFailedSense=0x03 }
ide: failed opcode was: unknown
ATAPI device hda:
  Error: Medium error -- (Sense key=0x03)
  Unrecovered read error -- (asc=0x11, ascq=0x00)
  The failed "Read 10" packet command was: 
  "28 00 00 02 6f 9f 00 00 01 00 00 00 00 00 00 00 "
end_request: I/O error, dev hda, sector 638588
Buffer I/O error on device hda, logical block 159647
hda: media error (bad sector): status=0x51 { DriveReady SeekComplete Error }
hda: media error (bad sector): error=0x30 { LastFailedSense=0x03 }
ide: failed opcode was: unknown
ATAPI device hda:
  Error: Medium error -- (Sense key=0x03)
  Unrecovered read error -- (asc=0x11, ascq=0x00)
  The failed "Read 10" packet command was: 
  "28 00 00 02 6f 9f 00 00 01 00 00 00 00 00 00 00 "
end_request: I/O error, dev hda, sector 638588
Buffer I/O error on device hda, logical block 159647