If you are playing Wii games from a USB drive or SD card using apps like or CFG USB Loader , you have three options: ISO, WBFS, or CISO.

WBFS stands for . Originally created by the developer Waninkoko, it was designed specifically for the Wii’s unique hardware to allow USB loaders to read game data efficiently.

WBFS is a file system used to store Wii games on a hard drive or other storage device, allowing users to play backups of their games without needing to swap discs. Here are some useful pieces of information:

The WBFS format, originally developed by the homebrew developer Waninkoko, solved this inefficiency through intelligent data scrubbing. WBFS stands for Wii Backup File System, and its primary function is to strip away the useless "dummy data" or filler files that Nintendo included on the retail discs to fill up the physical space. By removing this bloat and storing only the active game code and assets, WBFS files drastically reduce the storage footprint of a game library. This allows enthusiasts to store dozens, or even hundreds, of titles on a single reasonably sized USB drive without compromising the integrity or playability of the games.