(12-02-2018, 06:58 AM)Shadorino Wrote: If I recall correctly, the ISOs are not compressed but trimmed. All of my GameCube games are trimmed so I can see the real size. The range I got goes from 262 MB with Wario World, to 1.35 GB for Metal Gear Solid: The Twin Snakes.
Dolphin does actual compression (deflate) for GC games. It is also possible to trim/scrub games, though.