I want to add a second hard drive to my MBP and I would like one that is at least as quiet as the Hitachi Travelstar 7K500 that is currently in it. I have tried to find a review of the Hitachi 7K500 where the noise level was also tested, but I could not find one. So I have no idea how much noise my current hard drive makes so I cannot compare with other hard drive reviews. So by experience, what line of hard drive should I look at? Thanks!