USB 2.0 is pretty fast, if somewhat annoying to use on multiple systems if you like to map the same letters.....
Personally, I'm sold on 2.5" lappy drives for portable storage. The trick for USB-only power is to purchase a slow-rpm drive and put it in a case yourself.....I've got one that I use for my National Geographic TOPO! software --- every USGS 7.5' quadrangle map for AK, OR, ID, WY, CA, NV, UT, CO, AZ, and NM is on it. Truly a cartographic marvel.
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"Trend Number One is that people aren't getting any smarter."
Dogbert
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