CHD (Compressed Hunks of Data) is the gold standard. Originally developed for arcade ROMs (MAME), CHD uses LZMA compression and internal de-duplication, reducing God of War II (8.5 GB DVD9) to ~1.8 GB with zero quality loss. PCSX2 (nightly builds) and RetroArch natively support CHD.
: Highly recommended for its collection of fan-translated games and ease of use. How to Compress ISOs Yourself ps2 iso highly compressed high quality top
For storage space alone, converting your library to CHD or CSO saves 60-75% of hard drive space. For emulation, highly compressed ISOs can actually improve loading times on modern SSDs because there is less total data to read from the disk, even with decompression overhead. CHD (Compressed Hunks of Data) is the gold standard
: A popular older method where you compress an ISO into a .gz archive using tools like : Highly recommended for its collection of fan-translated
A landmark in RPG history. This title benefits greatly from compression, stripping away unnecessary padding data to deliver the emotional story of Tidus and Yuna in a crisp, high-quality format.