Once you have these components, follow these general steps:
The format is another highly compressed PS2 ISO container, originally popularized by the PSP scene. Tools like maxcso provide a fast and multi-threaded conversion from ISO to CSO.
Create a simple text file in the same folder and paste the following command line: for %%i in (*.iso) do chdman createcd -i "%%i" -o "%%~ni.chd" Save the text file as compress.bat . highly compressed ps2 iso
How to Create Highly Compressed PS2 CSOs (For Original Hardware)
CHD is supported by most major PS2 emulators, including PCSX2 (version 1.7.0-dev-1156 and later) and the Android emulator AetherSX2, though some specific builds or forks may have varying degrees of compatibility. The tool for creating CHD files is chdman , which is included in the MAME tools package and is also integrated into many user-friendly batch conversion scripts and GUIs. Once you have these components, follow these general
Compression ratios are slightly lower than extreme archival formats like .7z or .rar. 2. CSO (CISO / Compressed ISO)
| Tool | Description | Best Format(s) | Platform | Key Features | | :--- | :--- | :--- | :--- | :--- | | | A popular, free file archiver. | GZIP | Windows, Linux | Simple right-click compression; no command line needed. | | Pigz | A parallel implementation of GZIP. | GZIP | Windows, Linux, macOS | Significantly faster compression by using all CPU cores. | | Maxcso | A highly optimized ISO-to-CSO compressor. | CSO | Windows, Linux, macOS | Multi-threaded for speed; offers excellent compression ratios and is considered very reliable. | | chdman | The official tool for creating CHD files. | CHD | Windows, Linux, macOS | Included in MAME; converts many formats (GDI, cue, ISO) to CHD; requires command line use. | | ziso.py | A Python script for ZSO compression. | ZSO | Windows, Linux, macOS | Converts ISOs to ZSO; requires Python and the lz4 library. | | PSXiSO | A GUI front-end for several CLI compressors. | ZSO, CSO | Windows | User-friendly interface for those uncomfortable with command-line tools. | | GPC-batch | A collection of game image compression scripts. | CHD, CSO | Linux (Bash) | Automates batch conversion of entire game libraries, ideal for headless servers. | | EmuGame_Compress | A tool on GitHub for batch conversions. | CHD, CSO | Windows | Specifically designed for converting CSO files to CHD for PPSSPP and PCSX2. | How to Create Highly Compressed PS2 CSOs (For
A standard PS2 ISO contains:
(Functional, but the risks of malware, stripped content, and performance overhead outweigh the benefit of saved space for the average user.)
If you use PCSX2 (the premier PC and Android PS2 emulator), you no longer need to keep your games in the bulky .ISO format. The emulator natively supports highly compressed formats. .CHD (Compressed Hunks of Data)