Hi. I'm buying a MacBook/Pro at Gatwick airport next week and was wondering what hard drive apple uses for the 320 GB 5400 RPM? Also, if I decided I wanted a 7200 RPM drive, what does Apple use for the 320 GB version of that ? Would it be any noisier than my 5400 RPM 2006 Core Duo MacBook? Would it have a big impact on battery life? But moreover, is it really that much speedier? Thanks 