Using formats like GZIP (.gz) , CHD , or CSO to shrink the file while keeping all game data intact. Emulators like PCSX2 can read these formats directly.

But does this technological marvel actually exist? Or is it a myth perpetuated by clickbait websites? Let’s dissect the reality of hyper-compression, the engineering limits of the PS2, and what you are actually downloading when you see that file size.

Many sites offering "100MB PS2 ISOs" are known for hosting malware, trojans, or adware . They often require you to disable your antivirus to run a specialized "unpacker" or "installer" that can infect your system.

Instead of downloading potentially unsafe "highly compressed" files, you can compress your own ISOs to save space while maintaining game stability: