USB2 actually promises higher speeds than the original firewire. Problem is that it doesn't sustain very well and runs fastest in bursts. Then again, a game tends to work in bursts anyway, so it may be alright there. Still, top sustained speed was pretty high. I'd tend to say that a real USB 2 harddrive (not an uber cheap or flash memory type thing, but, something with a decent RPM of at least 5200, preferably 7200 and some cache) should get GW playable at least. Worst case scenario is long load times and occasional stuttering as it reads various bits of data and has to stop to wait for that data to load.
If you have or find a Firewire (even original firewire) harddrive, you'll probably get better results. It can sustain a high speed transfer pretty well. It's actually probably enugh for GW. A good firewire harddrive should perform much like a not so good ultra-ide harddrive (I'm thinking UDMA66, maybe 100,) and I'm still getting by in gaming on my UDMA133 drive (remember, SATA1 only goes up to UDMA150 and even with that, raptors are practically the only drives that truly take advantage of it, and they will eat your PSU for breakfast as well as whatever cooling system you may have -- that 10,000 RPM comes at a cost.)
Remember, no flash based drives. I think the fastest I ever heard of compared more to a CD-ROM than a harddrive, and there's a reason modern games install all their data to the HD then just use the CD for copy protections.
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