The Wii’s optical drive is notoriously fragile. Playing Wii games in WBFS format from a USB drive bypasses the laser entirely, extending the console’s lifespan. Many second-hand Wiis have dead drives—USB loading via WBFS is the only way to revive them.
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When you rip a physical Wii game disc to a hard drive, the raw data (an ISO file) is 4.37 GB to 8.5 GB (dual-layer). However, Wii discs contain significant padding and encryption that isn’t needed for playback from a USB loader. The WBFS format strips away unnecessary sectors, often reducing file sizes by 50% or more without affecting game quality. The Wii’s optical drive is notoriously fragile