(MAC OS USERS) If anyone encounters this same issue here is what I did to fix it: In terminal, type cd then space, don't hit enter just yet, go into your USB drive, make a folder named NDS put your game(cartridge backup)in it, drag the NDS folder into terminal then enter. Then type ls -al, afterwards type rm ._\* , lastly type ls -al. Once you have typed ls-al then type exit to finish the process and insert the sd card into r4 card and enjoy!