[tx_dbs_tx]

After checking voltage and amperage with my fluke, I have come to the conclusion that final output voltage is just a tad over 5V (5.108V). The voltage stays the same with just one or both usb connectors plugged into my PC. By using both i get more amperage and a solid chargeing state reguardless of data usage when tethered. I have done tests with constant video streaming without a single hicup and I started with under a half charged battery and after a few hours my battery was almost fully charged. Again this was with constant video streaming the whole time while also doing some web browsing at the same time. I am happy with the results and I have no fears of damaging my Touch Pro now that I have confirmed the voltage output. This is with the usb cable that I have. I'm not sure about the other one you mentioned above designed for hard drives although it being usb it should function the exact same as mine does as long as your computer supplies the same amount of dc voltage and is "daisy chained" to neighboring usb ports. For example if your usb ports on the front of your pc are supplied 5V from your power supply on it's own single circuit, then voltage will not double when plugging in both usb connectors. You will still have 5V. On the other hand, if you were to somehow tap into a front usb port and also a usb port from the rear of your computer, you will likely run into trouble as the ports are fed by a seperate circuit in most cases. I wouldn't suggest even trying that, beside you would have to adapt the usb cable and add an extion to accomplish that anyhow. Anyways this setup is working beautifully for me and for whatever it's worth I hope any of you with charging issues while tethering will give this method a try and post back with your results.