HD SC Setup fails drives drives for any number of reasons and I hate it.

Drive Setup however will less mercilessly perform an unconditional partitioning and format (saved a number of laptop SCSI disks that HD SC setup refused to touch) but you better go over the drive with a good disk utility to mark out any bad or failing sectors.

If Drive Setup doesn't work, that drive will never easily work on a mac again, mind you the 8425's were never great drives aside from the beautiful seeking noises they made.