I thought of that. I know one of my card isn't compatible with the Wii at all, its a USB drive and an SD Card. So I tried my Step-Father-In-Law's card. Which the Wii recognized and would read pictures from and copy data to. It wouldn't work between the Two Wiis and just copying a save from the Wiis internal memory, deleting the old one, and then copying it back to the Wii didn't work on either one of them as well. So I got another SD card which is a San Disk, same people who make the Nintendo ones, 1 gig card. Same deal as the other. Will do everything but copy the data onto the internal memory. I don't know whats up. Though it was two different fully updated Wiis that it did not work on. After talking to Nintendo and going all the way up through the support chain they couldn't figure it out and would note the problem. I'm fairly sure it's software because of it being the two different Wiis. Though if it isn't fixed by the time my warranty is about to expire I don't know what I'm going to do. I'll probably take them up on the offer for yet another new Wii but I lose my now 100+ hours of work.