So I've discovered that I need an external HD, since I've managed to suck the space on my MBP pretty quickly. Here's a rundown of my situation: -I dual-boot into Windows, which is probably where I need it more. And since some of the files will probably cross over, I'd rather have it partitioned to be readable in both Windows and Mac OS -1 (of 2) USB ports is always for my mouse, and the other is switched among flash drives, my portable (but small) external, and printer. If I were to go USB only, it'd have to switch there too. My Firewire ports are free -The external is going to largely store just files (movies, large installation files, etc), but I'd also like to be able to run apps off it. Specifically, games, since my Windows partition has no more space left on it. Optimally, I'd like the connection to be fast enough to run games, though I could drop that. Based on that, what do you think I should get? The WD/Seagate 500GB externals with only USB seem to run just under $100 right now (with BF upon us). The ones with firewire 800 seem to be steady around (maybe just below $200). And WD now has the Studio edition which I guess is for Mac users, though I'm thinking it would just be a waste of money. So what do you think? I guess the biggest factor is the connection speed. I know the numbers on USB and Firewire 800, but functionally, how fast are they? Is even firewire fast enough to run games?