Inserted this memory card in slot B to transfer my games. It worked fine in slot B, but when I put it in slot A, it kept asking if I want to format all the data on the card, and in other cases, the memory card was not recognized by the system. I ordered a replacement card but it didn't work either and I got my money back. EDIT (October 26, 2020): I ordered a third memory card (after returning the first two) because the company said they updated the card to fix issues with my Wii. I haven't received it yet but am changing my rating to 5 stars because the customer service was very friendly and also very willing to help me. EDIT (10/28/2020) I got my third memory card today. I tested it on my old Wii by following the instructions of another user who said "Put it in slot A only at certain times." And guess what happened next? IT HAS FINALLY FOUND! I have upgraded my rating to five stars for excellent customer service and would also like to thank my colleagues at Revain for their great tips!