UncorrectableError from two disk sectors

[Douglas Bates <bates@stat.wisc.edu>]

`dmesg' shows a lot of messages about two sectors on my disk.  For
example
 hda: read_intr: error=0x01 { AddrMarkNotFound }, LBAsect=1097170, sector=48787
 hda: read_intr: status=0x59 { DriveReady SeekComplete DataRequest Error }
 hda: read_intr: error=0x40 { UncorrectableError }, LBAsect=1097170, sector=48787
 end_request: I/O error, dev 03:05, sector 48787
 hda: read_intr: status=0x59 { DriveReady SeekComplete DataRequest Error }
 hda: read_intr: error=0x40 { UncorrectableError }, LBAsect=1097170, sector=48787
 end_request: I/O error, dev 03:05, sector 48787
 hda: read_intr: status=0x59 { DriveReady SeekComplete DataRequest Error }
 hda: read_intr: error=0x40 { UncorrectableError }, LBAsect=1044268, sector=814444
 end_request: I/O error, dev 03:03, sector 814444

Should this be a concern?  What action would be recommended?