Add the -cc zstd flag (if using newer CHDMan) for the highest ratio: chdman createcd -i "game.iso" -o "game.chd" -c zstd:lzma:cdzl

The Sony PlayStation 2 remains the best-selling console of all time, boasting a library of over 3,800 titles. From Shadow of the Colossus to Grand Theft Auto: San Andreas , the golden era of 6th-generation gaming is a treasure trove of nostalgia.

However, for modern gamers using PC emulators (like PCSX2), Steam Deck, Android devices (AetherSX2), or even modded PS2 consoles, there is one major problem:

A: Using 7z with Ultra settings, you can get it down to ~1.8GB. Using CSO level 9, ~2.3GB. You cannot go lower without re-encoding the massive 6GB of video files.

A: No. A real PS2 cannot read CHD or CSO files. You would need a modchip and an OPL (Open PS2 Loader) with a specific build that supports ZSO (a different format), but it is unstable. Stick to raw ISOs for real hardware.

Happy compressing!

A standard PS2 DVD holds 4.7 GB (single-layer) or 8.5 GB (dual-layer). If you want to store 50 of your favorite games, you are looking at . Enter the world of High Compressed PS2 Games —a solution that can shrink those massive ISOs down to 100 MB, 500 MB, or 1 GB without sacrificing the core gameplay experience.