Hi All. Apologies if this has already been covered. My iMac 500gb drive has filled up (mainly TV shows) , so I transferred the media to my 500GB USB2 WD external drive, and re-added it to iTunes (With the "Copy new media to iTunes folder" feature turned off. However, now when playing the media, Apple TV becomes unresponsive and Errors out. (only on the USB media, not the media on the iMac Hardrive). The work around at the moment is to pause the video and let it buffer. It still sometimes errors out ( about 40% of the time). My questions are: 1) Is the lag purely because Apple TV is sourcing a movie through the iMac which has to come from the hard drive (as USB2 is quite slow) , and 2) If i purchased an AC powered 1TB external (WD) that has a FireWire 800 connection, will this lower the lag? Thanks in advance guys.