The 7-Zip format utilizes LZMA (Lempel-Ziv-Markov chain algorithm) compression, which generally yields a higher compression ratio than the standard DEFLATE algorithm used in legacy ZIP files. For a "ROM pack," which may contain thousands of redundant files across different game clones, 7-Zip offers significant space efficiency.

Note: If you are using a frontend like or RetroArch , you can specify a custom path to this folder in the settings.