Disclaimer: Downloading ROMs for games you do not own is illegal. This guide is intended for backing up games you legally own. The Ultimate ROM File Compression Guide - Retro Game Corps
Look for .wia or .rvz files. They offer the smallest sizes while remaining playable without full extraction. nintendo wii roms highly compressed
The pursuit of "highly compressed" Nintendo Wii ROMs is a defining characteristic of the modern emulation and homebrew landscape. While a standard Wii disc (ISO) is exactly 4.38 GB (single-layer) or 8.5 GB (dual-layer), the actual game data is often a mere fraction of that size. This disparity has led to the development of sophisticated compression techniques that prioritize storage efficiency and network speed without sacrificing the gameplay experience. The Mechanics of "Scrubbing" and Padding Disclaimer: Downloading ROMs for games you do not
: An older Dolphin-specific compressed format. It is mostly obsolete now, having been replaced by the superior RVZ [1]. They offer the smallest sizes while remaining playable
The Tiny Revolution: Inside the World of Highly Compressed Wii ROMs