In another thread one of you told me that AVI is a package and that different Codecs are contained in it, responding to my concern that I attempted to run an AVI I got (the only one I tried so far) and it didn't run. Also, 3 or 4 different PDFs wouldn't load, it just says loading and stays there, nothing happens. If it isn't the speed of the MicroSD, why aren't PDFs and AVIs working on my card that I now have to RMA (for a different reason). Or, a better question, what book and video formats would I use, as I want to send this gift to my boy overseas with a video and a few books so he can see what the card can do. Or should I focus on just sticking to games and music?