I am going out of town this summer and need a scratch disk for some editing I need to do (and perhaps a few games? ) Apparently, the world's HDD manufactures have dumped FireWire and warmly embraced USB 2.0. My first question is... Is USB 2.0 sufficient speed for a scratch disk? If not, can someone suggest a good 2.5" FW drive that is inexpensive (under $150 would be great) Finally, How much space do you think I need? I have two big scratch disks at home, and the 2.5 would be more of a 'travel' disk for one or two projects and a small partition for windows games.