I had one of the USB drives. Biggest problem, no fan. That sucker would get warm!
The reason I don't have it any longer is because the setup guide said to use the default initialization in Drive Setup, which gives a standard format. I tried to use HFS+ with it, and it consistently locked up after a few hours, even without being too hot.
With standard format, your smallest file size on a 20G drive is huge.
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Alright you primitive screwheads, listen up!