Okay here's what I have got, if anyone else has done this, let me know where the thread is. I have an Airport Extreme with a 500GB hard drive attached to it. I store my movies and tv shows on it, which i get from torrents. I have created reference movies using which are basically links to the main files stored on the external hard drive. What is on my iTunes library is the reference movie. This allows me to save space and carry my music with me where ever I go. Will Apple TV be able to access those movies on the external hard drive using those reference movie links when it syncs with my iTunes library allowing me to keep my MBP turned off.