The original PC game requires approximately 3.6GB to 4.7GB of disk space. Shrinking this to 200MB requires removing essential assets like audio, radio stations, cutscenes, and high-quality textures.
However, a fully functional, playable version of GTA San Andreas at exactly 200MB does exist without major sacrifices. If you download such a file from a MediaFire link claiming to be the full game, here is what you will likely find: wwwmediafirecom gta san andreas 200mb free