None.
My external HD, and printer/scanner has a plug that plugs into a wall outlet. Digicam gets its power from its batteries.
I used to have a webcam that gets it power from the comps usb port, but my sister took it cuz i didnt use it much.
I just use usb to print or scan, upload or download stuff to my comp or other HD.
How many of your usb devices get its power from the comp?
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