I recently purchased ATV, and everything is working great. I'm streaming from both my laptop (MacBook Pro 17") and an external SATA drive on a Firewire 800 connection. When I stream 1920x1080 movies from my internal drive things are fine, but from the external drive, things start getting a little "jumpy". Anyone having luck with any portable external drives?...would an external 7200 rpm 2.5" SATA be fast enough over FW800? Thoughts?