They don't really benefit after a certain point, Racket. I just wanted to make sure they weren't being packed together and frying. Also, since he's tried them in different (otherwise OK) machines, I'd suspect the drives just have what we call in the computer business "SUCK TEH CACK". It's a technical term, I won't get into it here. Suffice it to say that your best bet is replacing the drives (you could also try and get warranty service, but good luck). I mean HDs aren't *that* much anymore, but it is inconvenient. Although I did see a nice 250GB 7k250 for around $160. Although your prices aren't going to be so good, from what I've seen from stores down under.