Some games, Donkey Konga 3 for instance you do need a separate memory card, but others, Kururin Squash! for instance you do not. The problem I am having with Donkey Konga 3 is that it won't save, which I guess it tells me in japanese. I have the save file on it's own memory card and I just want t know if doing the JPN/USA switch will enable me to save on a US memory card. I think it will, so I guess I'll do the mod this weekend and give a report after its done.