What I'm calling BS on is not the fact that bad-sector testing is done. It's his statement that a 120gb drive is the same thing as a 250gb drive that was just rated lower in testing.
For 120Gb vs 250Gb, then yes I'd agree, because in today's technology that's a whole other platter. But it wouldn't surprise me if today's 60Gb drives were 120Gb drives with one of the two heads disabled in firmware. It wouldn't even surprise me if today's 40Gb drives were 120Gb drives with one head disabled and the other short-stroked.
Edit: Mind you, it would surprise me if such measures could be reversed merely by corrupting one's partition table with a bug in Ghost.
Peter