If you have updated your Wii console to Wii Menu 4.0 How to or higher, then your Wii console is compatible with SD Cards that are 2 GB (Gigabyte) or less, and is also compatible with SDHC Cards up to 32 GB. SD Cards with a capacity higher than 2 GB, and SDHC Cards with a capacity higher than 32 GB, will likely not work with the Wii console