Actually I've had this problem for quite a while now. So I go into the GameCube's data management menu to delete save files or just see them and I get this: "The device in slot B must be formatted before it can be used. Would you like to format it?" And instead of clicking yes, I shake my fist violently and curse at my system. So I click yes; it tries and comes back to me with "The format was successful, but the data is corrupted." I'm sure one of you knows how to fix this. And yes, I have another card which is the exact type as this one.