I have plugged my fire in to the usb of my pc then transferred files to and from the fire but instead of disconnect the cable I tap the disconnect on the fire screen and go about my way installing apps etc. I agree it will not charge the fire and it will not run it but at lease I can quickly do what I need.
Also I have not verified how long it takes but I have used my kindle 3 cable and charger to charge the fire when the fire was a sleep.
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