SD card not reading videos????

view story

http://androidforums.com – So ive bought my new 64 gb sd card. I had a few avi files and mkv files that i had downloaded via utorrent. The videos work conpletely fine on my internal storage but when I move these files to my sd card the files say "cannot play this video" I assumed it had to be the format so I downloaded a converter and converted them to mp4 format. Then tried again to move an episode onto ny sd card. It came up with the same problem. ive tried for hours on end trying different videos and players and nothing has solved this problem. When i put on the first two season which are in mkv file format (General)