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Abstract The Nintendo Wii introduced optical media based on a proprietary, high-density variant of DVD. To facilitate backup and digital storage of game libraries, the homebrew community developed the Wii Backup File System (WBFS). This paper examines the architectural design of WBFS, its operational mechanisms for data stripping and fragmentation handling, its performance characteristics, and its eventual obsolescence due to modern container formats (e.g., .wbfs files). 1. Introduction The Nintendo Wii console utilizes 12 cm optical discs (Wii Optical Disc) with a capacity of 4.7 GB (single-layer) or 8.54 GB (dual-layer). These discs contain a custom file system known as the Wii Disc File System, which stores game data in encrypted sectors.
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