Hi,
I have a Humax 7510, I've tried both an USB 2.0 and USB 3.0 1TB external portable HDD and although the lights comes on, the 7510 can't see the drive. One of the drives makes a very loud clicking noise. I'm assuming the USB port is not generating enough power for the HDD. So what is the limitations with what portable drives can be used ... is it only 500GB and under? Or can it only use external HDD that are self powered?