I have a new 512 gb flash drive. It is formatted with exFAT. when I put movies on it (using a variety of file types) only the first 4 files will play. After that I get an error message on Windows media player saying "Windows media player cannot play the file. The player might not support the file type or might not support the codec that was used to compress the file." VLC media player just won't open them. All of the files work fine on the pc storage and on other flash drives and like I said, the first 4 files will play without a problem. Music files seem to work fine.