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I'm not saying the ports are underpowered, it does not take more than 150mA to drive data to a device. But in order to feed enough power to charge, it's not the same thing. Sorry if youo thing I don't understand how it work, I'm a computer tech and I actually manage over a 1000 workstations. What I say is that MAYBE, his usb port does not provide enough power to CHARGE the reader, not to use it and to exchange data with it.
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