Today I started to play "3264 - B Team - Metal Cartoon Squad (E) (Independent)" and when I return to the menu (soft reset) I lost all visibility of the skin. Everything was black but I read a few things. Then I rebooted my 3DS, start the card and shows me the message "NO FIND SYSTEM FILES" Why? Everything was in order. Everything worked before. I tried removing and putting the microSD and nothing happens. Then I wanted to see the files on my PC, when I realize that the memory had lost the format. The memory is a Sony 4GB HC Class 4. I did not want to format because I will lose my files, but apparently I can not recover it. Will this happen again? Should I use a 2GB memory? Any suggestions?