Hello, I ran into this trouble with a new card I got for my DS Lite. I heard some good things about the new 2.10T card from the R4 sdhc team and decided to try it http://r4sdhc.com/. It loaded up fine and played the games I threw on it. But I started to encounter problems with it saving properly. I'll save, shut it down and when I try to play again it won't have a .sav file. My micro sd card was properly formatted and working fine on other devices, and I tried to find if anyone else was having this problem, but couldn't find much. Any of you heard of this issue?