I just bought a base model 13" MacBook Pro, and would like to upgrade the HDD myself..... will this void the warranty? if not, what do I need to look for? I would like >320GB, but dont know the specs for the drive that is compatible. Does anyone have any preferences for drive brands? also saw in another thread, someone said that their 7200rpm drive was causing vibrations.... so id probably go with a 5400rpm thanks in advance.