well, you must realize that a usb drive hooked up to an aeb via I presume wireless, then the mac wireless to the atv will cut your bandwidth in half. Cause the move has to be streamed on the network to the mac, then streamed back to the atv. Its not like its a one way connection from the aeb with the usb drive right to the atv. Provided I understand your setup correctly. If not, please disregard the above.