I assume this is common knowledge but I searched and could not find the answer. Can you use a USB hard drive while connected to a TV via HDMI out? I know this is an issue with the MHL spec used on some phones but was not certain if the same is true for the Transformer Prime. To clarify: I would like to be able to play video files off of an external USB drive and display them on my TV via HDMI out. Thanks in advance.