I am guessing this is a throughput capability question. for me, to green find an obvious answer on forums. Have HP m7690n, MC, no issues, but want to download to large external HD using USB2, (no Esata)...at least thats doable, yes? However, will USB2 playback pose a bootleneck to playback? I just can't find facts to throughput requirements/limitations for playback . Hoping to find wisdom, all info here is enlightening.