Ok, I have a 1GHz 12"PB. Because Apple lame quality products the internal one doesn't work any more. Yes! Apple is selling us "state of the crap" equipment. So, I am using for now my external firewire drive for the system and tyhe computer is running at list TWICE as fast now. The original drive was 4200 rpm, the external drive I am not sure yet but I am expecting another internal drive at 7200 rpm!. Right now al the applications are opening very fast, at list the double including the windows and everything. Really, if you want to get the most from your powerbook start by changing the main hard drive.