Huh. I couldn't see the back when I moved the cable, but I thought I plugged it into the USB3 port because I have my AirTV adapter plugged into the hub on the Seagate. Aha. I found a picture on Solid Signal:The only difference is that the top port is USB-3 while the bottom is USB-2. But it shouldn't matter as the Hopper can only support USB-2 speeds