Do these two devices work any differently. They're both powered externally? Will both of these be equally effective at eliminating a ground loop?
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A USB hub will probably tie all the grounds together, so that won't help you break your ground loop.
Update: I just checked a Belkin F5U701 hub with my multimeter (in continuity mode). The grounds of all the USB ports are tied together and tied to the ground of the power supply.
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