Well i was regularly playing my acekard and then i shut it off to do something else. When i came back and turned it on it says 'wrong system file' or something and then i restarted my dsi, the message doesnt show anymore instead it takes FOREVER to load and you CANNOT play games it just turns into a white screen. So i tried taking out the memory card and put it on my computer to see whats wrong .. most of my games are gone and is replaced by a '0223E~01.WEV' file and the system files are still there. Even though most of my games are gone, the memory isnt restored and i have only 2 games left (60mb alll together) and that wev file(which is 512kb) and systems files however it takes up my entire memory card WHICH IS 512 MB.