When groups like No-Intro (cartridges) or Redump (discs) preserve games, they aim for historical accuracy. This means a full set for the Nintendo Entertainment System (NES) doesn't just contain the games you played. It contains:
: Most repacks also strip out non-game data like BIOS files, prototypes, demos, and unlicensed software. Recommended Tools for Creating Repacks 1g1r rom sets repack