I just replaced the old 250gb HDD in my Penryn Blackbook for a 750gb WD Scorpio Black. I am loving the capacity and speed, but it seems like there is a bit of vibration going on underneath the palm rest, which resonates out to the whole top of the case. It basically feels like the SuperDrive is loaded up and spinning.. I've tried reseating the HDD, re-tightening the torx screws, and reseating the L bracket, and the issue is still there. Is there any way to damp the vibrations? Sorry if this topic has been brought up over and over again- I've searched around a bit, and can't seem to find a definitive answer. I found some were saying that there was a large amount of vibration, while others found their drive to be completely silent/still. I realize that it really comes down to user tolerance, and I guess I have a pretty low tolerance for this, but I was just wondering if I should expect this kind of vibration coming from a 7200rpm drive? If anybody has previous experience with these drives, is this normal? Does this vibration stem from the design of the laptop? Or did I get a defective unit? I've never replaced a HDD on a laptop before, so coming from the dead silent and still stock HDD, this is quite surprising for me. Thanks.