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It is widely supported by Open PS2 Loader (OPL) versions 1.2.0 and later, as well as some modern PSP custom firmwares and emulators. Top ISO to ZSO Converters (2026 Update)

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On devices with slow storage interfaces, such as PS2 USB 1.1, ZSO can actually improve performance because the console reads less data from the drive, reducing stuttering in FMVs (Full Motion Videos). It is widely supported by Open PS2 Loader (OPL) versions 1

If you are looking to maximize storage on your retro gaming handheld or console, finding a reliable is a priority. The ZSO format, which uses LZ4 compression , is a lightweight alternative to the classic CSO format, offering faster decompression speeds while still significantly reducing file sizes for PSP and PS2 games. What is the ZSO File Format? If you are looking to maximize storage on