What is Wii’s media format?
Wii will play proprietary 12cm discs, which is the same size as DVDs. It will also be able to play GameCube Optical Discs, as it is backward compatible with the unit. Details on the new 12cm discs are slim. Nintendo initially announced that the discs would be dual-layered, offering upward of 8 gigabytes of storage. However, shortly after the announcement, it removed all mention of dual-layered discs from its official Wii press release.