I received a MacBook Pro with 160GB 7200rpm upgrade that has been returned for a bunch of issues, which I won't go through here. I thing I noticed is the keyboard and palm rest had an annoying slight vibration. The Apple store person said that was normal, but when I tried all the Macbook Pros on the store the, out of the 9 machines they had only 1 had the vibration (17" one). After the visit, I came up with the theory that the 7200rpm hard-drive was causing the slight vibrations on the keyboard and palm rest as the ones in the store were all 5400rpm and the 1 17" MBP that did vibrate had the 7200rpm. Can you guys with 7200rpm confirm or deny the slight vibration on the keyboard and palmrest?