Originally popularized by the PSP, these formats are also supported by modern PS2 emulators. They offer great compression, though CHD typically edges them out slightly in file size efficiency. GZ (Gzip): You can use a program like to compress a raw file directly into a
| Tool | Output Format | Compression Type | Typical Size Reduction | Best For | |------|--------------|------------------|------------------------|-----------| | | CHD | Lossless (LZMA + FLAC) | 25–35% | All games, emulator-friendly | | CISO / MAXCSO | CSO | Lossless or lossy (zlib) | 10–25% lossless, up to 60% lossy | PSP and PS2 on low-storage devices | | 7-Zip (Ultra, LZMA2) | 7z | Lossless | 15–30% | Archiving, not direct emulation | | PS2 Dummy Remover | Trimmed ISO | Lossless (data removal) | 20–50% | Games with large dummy sectors | | RVZ (Dolphin-emu) | RVZ | Lossless (specialized for Wii/GC, hackable for PS2) | 30–40% | Cross-platform, advanced users | ps2 iso files highly compressed full
Here are fan-favorite titles that compress exceptionally well (original size → compressed size): Originally popularized by the PSP, these formats are
