I bought a MBP13 with a 250 GB. I noticed that the HD is a Seagate 250 GB 5400 rpm. So i thought I would upgrade it to a Seagate 500 Gb 5400 rpm(Momentus). Now the noise is noticeable. Not much, but you can hear it. Should a 500GB harddisk be more noisy than a 250 Gb? I thought it would be the same. The only difference I saw between the two harddisk is that the old HD had a Apple logo on it. Otherwise its the same brand and model, just with a higher capacity. If I had upgraded at apple would I have been rid of the noise or is this just something that follows along with the higher capacity?