If you own the original game disc and have dumped it into a standard .iso format, you can compress it to a .cso format yourself to save space using tools like or UMDGen : Compression Level File Size Reduction Performance Impact Recommended For None (ISO) None (Fastest loading) Older PSP Memory Sticks Medium (CSO Level 5) Imperceptible Original PSP Hardware High (CSO Level 9) May cause minor stuttering on real hardware Modern PC/Android Emulators Performance Optimization Tips
: Switch between OpenGL and Vulkan to see which performs better on your specific graphics chip.
Standard PSP ISO files contain the complete, uncompressed data from the original UMD disc. In contrast, CSO files use compression algorithms to significantly reduce the file size—sometimes from over 700 MB to as low as 255 MB. This reduction comes with no noticeable performance impact on most games. sonic rivals 2 cso psp full
Searching for the Master Emerald, which has gone missing. 4. Why Play the Full Version?
Ensure your PSP is running custom firmware (CFW) such as PRO or ME. Connect your PSP to a computer via a USB cable. If you own the original game disc and
is a 2.5D competitive racing/platformer developed by Backbone Entertainment and published by Sega in 2007 for the PSP.
The format itself is legal. It is the act of downloading a copyrighted game's CSO file from the internet without owning the original that may be illegal. This reduction comes with no noticeable performance impact
This ISO folder is where your sonic_rivals_2.cso file must be placed. Playing Sonic Rivals 2 CSO on Emulators (PPSSPP)
To get the best performance from a CSO file on original hardware:
