This is ridiculously frustrating trying to find a reliable list of compatible formats for media (video)...thank you Sony, not. I finally got the set top box to recognize a 1TB external USB drive. The media player finds the files but won't play most of them. I have many different formats. The ooddball thing is that it will play some AVI's...some it won't. It will play some MP4's, some it won't. Uber irritating. What format is the Sony "gold standard" that this stupid unit will play and play reliably? I have Wondershare Video Format Converter, I can convert into just about any format...but I'm a bit tired of the old trial and error method.