Not all SD Cards are compatible with the Wii console. Please read the following:

• The Wii console is only compatible with SD Cards that are 2 GB (Gigabyte) or less. Cards with a capacity higher than 2 GB will likely not work with the Wii console.
• SD Cards with a slow speed may experience slow transfer time when loading files, or may not work at all. Slow transfer times can also occur with SD Cards that have a great number of files on them.
• While any SD Card with the above specifications may work, Nintendo has licensed specific SD Cards for use with the Wii console. You can identify these cards by the Nintendo Seal on the packaging of the SD Card. At this time, there is one licensed SD Card manufacturer:
  
  Bensussen Deutsch & Associates, Inc. (BD&A) Switch and Carry
  256mb, 512mb, 1 GB

Please note that even with a compatible SD Card, some devices may create image or movie files that are not compatible with the Wii Console. Click here for more information.