: By archiving your library in CSO format, you can often fit twice as many games on the same microSD card.

(Compressed ISO) file is a lossless, compressed disk image format used primarily to archive and play PlayStation Portable (PSP) games from a memory card. It was designed to save storage space, which was critical when original PSP memory sticks were expensive and small. 1. Key Differences: ISO vs. CSO File Extension CSO - Avanquest

Building or accessing an archive ensures long-term preservation of the PSP's legendary library, which includes masterpieces like Crisis Core: Final Fantasy VII , God of War: Ghost of Sparta , and Grand Theft Auto: Liberty City Stories . How to Build Your Own CSO PSP Archive