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The Preservation Gap: Evaluating the Impact of Unofficial Distribution Networks on Retro Gaming History.

: Always cross-reference the ISO's MD5 checksum with a database like to ensure the file hasn't been tampered with.

How is this possible? Repackers remove unnecessary data like dummy files, duplicate audio tracks, or pre-rendered videos in lower quality. They then compress the remaining files using brute-force methods. When you extract the game, it rebuilds into a playable ISO or folder structure.