I installed a 32gb SD card that was described as a class 10. When I try to copy movies to it, either they won't play at all or I get video but no sound. I can put one of the same movies on the internal storage and it plays fine, so the video file is not the problem. I was also able to copy some music to the card and it also seems to play fine. I am wondering if it is the card that is not able to handle the video files for some reason or what the issue could be. Another strange thing is that after I had trouble with a couple of the video files and deleted them, it still shows that memory as being used. Any thoughts?