An ISO file (named after the ISO 9660 file system used on optical discs) is a raw, uncompressed, sector-by-sector copy of a disc. When you rip a GameCube or Wii game to ISO, you get a file that is exactly 1.46 GB (GameCube) or 4.7 GB/8.5 GB (Wii). There is no compression. Every "dummy" byte is preserved.
How to Convert RVZ to ISO: A Quick Guide for Retro Gamers If you have a collection of GameCube or Wii games, you’ve likely encountered the convert rvz to iso