The Rear USB port does not allow USB cables to seat completely. There’s about an 1/8 gap. With USB 2.0 devices this does not seem to cause any problems. However, I can’t get my Hard Drive (Seagate FreeAgent GoFlex Desk 3TB) to work with a USB 3.0 cable plugged into the rear. It works just fine when plugged into the front, and the USB Cables plugs completely into the front USB port.
This is the 3rd “WD TV Live Streaming” that I’ve gotten and they all have this flaw. I called WD Tech Support and they claim that the USB cable plugs completely into the back of the one they have in their test area. So it’s possible this is a manufacturing flaw. On the 3 WDTV LS I’ve had there’s about an 1/8 inch gap from the USB cable not seating completely. The same cables seat completely into the front port. I also tried several cables and USB devices. None of them seat completely into the rear of the WD TV LS, but they seat completely in the front.
I could just use a USB 2.0 cable or plug the cable into the front, but this is an issue for WD because people (like myself) will just assume that the rear port doesn’t work correctly and return the device. If I plug something into the front port and it works fine, and it doesn’t work when plugged into the rear port my automatic assumption is that the port is defective. I returned two of these before I finally realized it was due to the port not working with USB 3.0 cables.
I did look in the manual to see if it said the two ports were different in some way, but on page 8 it says that USB Port 2 has “The same function as USB port 1.” Which isn’t the case.
Also, I know that the WDTV LS is technically only USB 2.0 compatible, so you could argue that it’s not guaranteed to work with a USB 3.0 cable, but there’s no reason it shouldn’t work if the ports are properly designed.