Jeff Liebermann wrote:

>> Plug in any working USB device that takes power from USB.
>
> Control Panel -> System -> Hardware -> Device Manager
> Universal Serial Buzz Controllers -> USB 2.0 Root Hub
> Hit the "Power" tab and it will tell you its current drain.
>
> This does not work on very USB device but seems to work on everything
> in front of me. I just pluged in two SanDisk 2GB USB Memory things.
> The page claims they burn 200ma each. That's not actually a
> measurement of its current drain, but rather the rated current as
> specified by the device in its driver. Other "root hubs" inside my
> machine claim my USB camera requires 100ma and my HP 3420 printer
> requires 10ma.
>
> If plugging in your USB Buffalo Radio totals something near 500ma for
> everything, you've hit the maximum.
>
It's different on mine. I have 4 ports and it specifies that the Hub is
self powered and total power available is 500ma per port.
http://en.wikipedia.org/wiki/USB