I've seen THREE answers to this question in this thread and I think this guy is messing with UR heads...
On another thread... relevant in the Extreme:...
Why couldn't the "Missing 5V supply come from the USB port... It is used to Charge a LOT of 5V devices and at fairly husky currents > .2A (conservative W/o Hub... Even better Idea would be a USB Chargw plug into a powered hun disconnected from the USB port... Lots of power only, no data or other issues.
Doc