A good rule of thumb is this:

If the USB drive has a port for DC power, or ships with a weird
2-headed USB Y-cable, it requires more power than 1 USB port can
provide.

If the drive does not have a power port and just includes a single
cable, it is designed to follow the USB spec.

The drive I have been testing with works fine self-powered, it's a
320GB WD Passport and does not have any sort of power port.


-- 
andyg
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