Every official Nintendo Wii game disc has a maximum capacity of 4.37 GB (or 7.92 GB for dual-layer discs like Super Smash Bros. Brawl ). To ensure the console's optical drive could read the discs correctly, Nintendo filled every unused byte of a game with "garbage data" or dummy bytes.
You can easily compress your existing games using tools built into modern emulators: : Open Dolphin and right-click your game in the list. Select Convert File . Choose RVZ as the format and click Convert . Using WBFS Managers :
It is mathematically impossible to compress several gigabytes of un-padded game textures and audio down to 10 MB using standard compression.
Are you planning to play these on or an emulator like Dolphin? The Ultimate ROM File Compression Guide - Retro Game Corps
Searching for “Wii ROM highly compressed” leads to:
For more advanced users, offers a powerful command-line suite that can manipulate almost any format, from ISO to WBFS to WIA. The Dolphin Emulator itself is also a powerful tool for compression; it can convert games from WBFS or ISO to RVZ natively. Furthermore, a tool called DMToolbox exists for compressing GameCube disc images, which are often used alongside Wii games in emulators. Finally, to manage large game collections, you can use ROM Manager , a Python script that can batch-convert entire libraries of games into formats like CHD or RVZ.
The actual game code, textures, and audio remain completely untouched.