[ChuckMcM]

Nice debugging story. When I was at NetApp there were lots of times when drive firmware for the 'less used' options would fail. On the fiber channel drives the 'write zeros' command which was supposed to zero a drive was notorious in its in ability to achieve something that simple. When Google looked at (I don't know if they finally deployed it) the disk encryption technology it worked differently disk to disk and firmware rev to firmware rev. I think it was Brian Pawlowski at NetApp that said "You can count on two things working right in a hard drive, read, write, and seek." The joke being that you needed all three of them to work for reliable disk operation.