5. Make sure the SD card is white and has Wii on it or it might not work. Haven't tried regular SD card yet, only the approved Wii SD card.
Hope this helps
Why would you want a Nintendo brand (or white with wii on it as you put it) sd? By buying a Nintendo brand one you will have limited warranty on it and pay more. I suggest instead going to a computer store and buying a decent brand like Kingston. On a good brand you will get between 5 years - a lifetime warranty, and pay less than a Nintendo one.