| Format | Compression Ratio | Quality Loss | Emulator Compatibility | |--------|------------------|--------------|------------------------| | (archive) | 30–50% | None (requires full extraction) | N/A (must extract to ISO) | | .CHD | 20–40% | None | Excellent (PCSX2, AetherSX2) | | .CSO | 10–30% | None | Good (slightly slower loading) | | Repack (custom) | 70–90% | High (FMV pixelation, missing music) | Poor (often crashes) |
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