I want to upgrade my MacBook's hard drive to something with a lot more space. I have the last generation of the plastic white/black models (before they remade white), purchased on the last day of December '07. It is the 2.2GHz model with a 120GB HDD and aftermarket 4GB RAM. I would like at least a 500GB hard drive or more. I was looking at this one from Hitachi because it is the second bestselling/reviewed one on Amazon and it's 7200 RPM compared to the top selling one on Amazon, a Western Digital 500GB @ 5400 RPM. Will the Hitachi be significantly faster due to the RPM difference? Or do you guys have any other good hard drive suggestions (preferably more than 500GB)? Also, where can I find out the RPM of the hard drive inside my MacBook right now?