After looking in to the issue and reading a couple of threads, I've come to the following regarding my MBP 13: Problem: Constant spinning noise from Hard disk drive. Not much, but enough to be very annoying when I'm at the study hall or alone. Analysis: Istat fan rpm; 2000, resetting SMC, nothing changed. Conclusion: It's the Toshiba 500 gb drive that's making excess noise. I've compared to my friend's MBP, which has the Hitachi 250 gb, and it's considerably more quiet. I feel cheated for wanting more space, paying more and then end up getting more noise. But what to do? A replacement MBP would probably have the same problem. Could I go to Apple and make then downgrade the HDD? Or maybe install a different 500 gb HDD? Could I buy a SSD, and make them install it for free? As you see, I am willing to do a lot to get this noise away, because i really really dig this machine.