The setup is as follows: 500GB Maxtor 3200 External USB 2.0 drive connected to Mac Mini, Mac Mini connected via cat 6 to Time Capsule (1000baseT), and 2xAppleTV connected via 802.11n. I want to stream to each AppleTV at the same time and that seems to work okay when streaming DVD quality content. HD content will stutter and freeze though as it tries to fill the buffer. The bottleneck seems to be the external drive, but what can be done about it? I want to stream (not sync) from a single external drive.