So actually looking at it again I'm not sure if I'm understanding what exactly was done. But either way, the write protected switch on an SD card is a small piece of plastic on the side of your SD card that can be moved up and down. When it's in one position the SD card is write protected, you can't write to it and the Wii can't read from it (as far as I know). When it's not in write protect mode it works like you'd expect an SD card to.