okay, I brought a 12" Powerbook... and I didn't realize the hard drive was 4300rpm? Anyway, I want to buy a Firewire 800 120GB hard drive... now, when i am at home or the office, is it possible to use it as a startup hard drive over the internal powerbook hard drive... i assume it would be a little quicker because is 7200rpm... but may be the firewire port will slow it down because I am using firewire 400 instead of 800... any suggestion?