The premier PS2 emulator natively supports .chd and .cso formats. Simply point the emulator to your compressed games directory, and they will boot exactly like standard ISOs.
PlayStation 2 (PS2) ISO files are disc-image files that contain an exact copy of a PS2 game disc’s data. Enthusiasts and preservationists sometimes compress these ISOs to save storage space, create faster downloads, or archive large libraries. Below is a concise essay covering what PS2 ISOs are, common compression methods, benefits and drawbacks of high compression, legal and ethical concerns, and best practices for legitimate use.
Before you start downloading every "highly compressed" file you can find, consider the reality of using them on emulators like PCSX2.
A "highly compressed" PS2 ISO usually refers to a game disc image that has been shrunk to a fraction of its original size—sometimes under 500MB—using specialized compression formats like Popular Compression Formats CHD (Compressed Hunks of Data)
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