I got a couple of 750GB's in last week and installed them. I've dumped a bunch of data one from an older drive I removed, and that's about all I've done with it so far, but I did notice that it is loud. Very loud, on seeks anyway. Clank-Clank-Clank. I have a 74GB Raptor and can hardly hear that thing in my case with all the other fans, but this thing makes a noticable racket. Doesn't bother me as I don't use them for anything other than storing movies and tv shows, so I don't have to access them while "using" the computer. If you do plan on making one of these an app or OS drive, I suggest you try it first as the noise could quite annyoing if used in that situation.