My friend purchased me a used R4 card with a 2GB Micro SD Sandisk card. I was able to plug it in to my DSlite and play the existing games as well as add my own. (I had a DSextreme previously) I went out today to best buy and purchased a 16 GB PNY micro SD card for more space. When I copied over the data of the 2GB card to the 16GB, my DS would lock up at the 'loading...' screen while using the 16GB card. The 2GB still works properly. The 2GB Micro SD card is using Moonshell 2. I have tried formatting the 16GB card (just windows formatting to fat32) several times and also searched for various versions of moonshell 2, 2.10 being the latest one I tried. All versions yielded the same results. I am aware from this site that there are plenty of 'fake' cards out there. Unfortunately, being a gift, I really have no way of knowing what my R4 truly is without the original box. The cartridge reads... R4 Revolution for DS (NDSL/NDS) I picked this forum because it may be Micro SD related. ADMIN please move this post if it should be in a different location.