As a side note, some have tested okay (using Seagate's "SeaTools for Windows") but are clearly marked "NG" on the label. I'm talking about HDs with 100G or more. That would kind of make it hard to sell them, wouldn't it? I can't help but wonder if it was intentional.
I have one here that came out of our home computer, it'll run for a short while then the bearing gets hot and starts seizing.