WBFS emerged from the early days of Wii homebrew development. Initially, playing backup games required burning DVDs and using modchips. This approach was problematic because poor-quality discs could quickly wear out the Wii's delicate slot-loading drive. Researchers discovered that Nintendo's USB drivers could be leveraged to load games from external hard drives, leading to the creation of custom IOS (cIOS). Kwiirk then developed the WBFS file system to dramatically improve read speeds and efficiency.
To solve this, modern WBFS managers automatically split games larger than 4 GB into two parts (e.g., game.wbfs and game.wbf1 ). The Wii's USB loader will seamlessly read these split files as a single game. How to Organize WBFS Files on USB or SD wbfs files wii