what exactly does "bottom of the drive" mean...
PS: This reminds me of a funny story. I was once (this was 1988 or so) explaining to someone that one of our (TCS) satellite offices had a Burroughs B1900 -- batch jobs only -- where the entire disk used to shake when the job entered the "sort" phase, so badly that even from way outside the computer room we could tell.
He said, "oh yeah that's a very old sorting technique. Shake the disk and all the heavy records fall to the bottom"