The 3ds supports carts up to 8GB(nintendo themselves confirm this) but I doubt we'll see any games of that size until way way in the future. Look at the ds, the _only_ 2 games to use the 512MB carts are pokemon b&w2. And they're _only_ using 260MB of data in total. So don't expect _any_ games using 8GB total until 3++ years from now at the earliest. Also to teh guy who's talking about fat32? Why the hell would you want that? Use ext2 or flashfs. Both are _way_ faster and support sd cards up to the bajillions of gigabytes. Otherwise you're going to have issues since ex-fat is patented and getting software to work with it is "fun" at the least. I mean yes we are talking about flash cart makers here, but still exfat isn't very common anywhere but windows and maybe mac osx.