Gone are the days of carrying around physical UMDs. With a solid , you can fit the entire lifespan of the PlayStation Portable in your pocket.
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: While CSOs save space, some "heavy" games may experience longer loading times or occasional stuttering on original hardware because the PSP's CPU must decompress the data on the fly. How to Use CSO Files ARK-4 e/CFW for the PSP and PS Vita. - GitHub cso psp archive