I had a similar problem with the HighPoint 1640 4-port SATA RAID board, see http://ubuntuforums.org/showpost.php?p=10400695&postcount=18 and following for details.
Building and installing the hpt374 driver from the HighPoint web site fixed it.
Recently I installed Debian squeeze and the bug did not show. Squeeze uses the hpt366 for the board.
I had a similar problem with the HighPoint 1640 4-port SATA RAID board, see http:// ubuntuforums. org/showpost. php?p=10400695& postcount= 18 and following for details.
Building and installing the hpt374 driver from the HighPoint web site fixed it.
Recently I installed Debian squeeze and the bug did not show. Squeeze uses the hpt366 for the board.