I remember a while ago reading about a few problem games with DS Flashcarts like the R4 or CycloDs Evolution. But since I played my NDS games off their original carts, I didn't bother to look into it. A few weeks ago I backed up all my NDS carts onto my CycloDS Evolution so I could carry them all with me as well as not need to switch carts to play a different game. All of my games (so far) seem to work fine..... except for one. Castlevania: Portrait of Ruin. I remember this was the game that I heard about having the most problems, so I Googled it, and found this: http://www.teamcyclops.com/forum/showpost....amp;postcount=9 From what I understand, you need a card that can maintain a Random Access Time of 0.7 or less, and not only can some cards not pull this off, but some cards also have this time go up the more data you put on it while others can maintain it regardless of amount of data on them. However, my card brand is A-Data, which is one of the two brands they recommended. It is a 8GB MicroSDHC card. Could A-Data have used a different manufacturer by the time I purchased this card? On top of that, I tried the NDS version of the libfat app that was posted there, I chose "all tests" and instantly I just got "error" for every test. So I have no idea what to do now. How can I test that my card is fast enough for CastlevaniaOR? Is there any way to check the real manufacturer of my card? Where in the US can I guarantee that I will get a card that is fast enough and will maintain that speed even when full? Are there any other games known to cause problems like CastlevaniaOR?