I have a ibook G4 and what I dont get is, why does protools reccommend buying an external harddrive to get full performance, because firewire speeds are 40mb a sec, so doesn't internal harddrives have faster speeds than 40mb a sec, becuase its internal? I guess what I'm trying to say is, I want a new external harddrive with 500gb regardless of audio. I can buy reg ones for $130 or I can go all out and get oxford 911 chipsets and bla bla bla to improve performance with protools as well as being a storage drive. What are your suggestions for money vs performance? As well as if you have experience with performance boosts with an external hardrive vs. internal. Also, I want my ibook running to the best of its abilities, what % of harddrive space do I need to have left before I see performance issues, and is there a program out there that eliminates having to worry about what ur disc space is becuase it some how optomizes it? basically I'm looking for a program that will optimize as if it was freshly formatted. Thank you.