: Modern compression formats like CHD or GZ can reduce ISO sizes by up to 30% to 50% , making them ideal for handheld emulators or consoles with limited SD card space.

: Files claiming to be under 500MB often remove "non-essential" data like radio stations, cutscenes, or high-quality textures to achieve such small sizes. How to Use Compressed ISOs

: A direct, uncompressed image of the game disc.