I've had a SCSI drive with a corrupted card before. That's no fun. Remember that SCSI harddrives have their own little embedded controller on them that accelerates some functions and if that goes a little crazy, you could have problems. Sometimes certain dodgy SCSI drives don't work with certain SCSI controllers.
If the problem still occurs (as you said it did) with a different hard drive, try swapping to a bigger power supply as brownb2 said.
Oh, and you can open the .info file in the root directory of the hard disk in the icon editor to make changes.
