I just got my Apple TV recently and now I want to use an external hard drive. I am thinking about getting a 500gb external Hard drive and then hook it up to my iMac with some movies and TV shows on there. Will my apple TV recognize it? Also I was thinking about getting the 500gb or the 1tb time capsule instead of an external hard drive, can I put videos and songs on there and have my apple TV stream over the air that way? What is the best way to go?