With only a 2GB card, a user could store perhaps one or two games. This hardware limitation birthed a software solution: the CSO (Compressed ISO).
, but only at compression level ≤5.
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During the PSP's peak, these memory cards were prohibitively expensive. A 2GB or 4GB card often cost nearly as much as the handheld itself. Consequently, the average user had limited space for digital content. A standard PSP game disc (UMD) could hold up to 1.8GB of data. If a user ripped their legally owned game to a digital file (ISO), the file size remained largely identical to the disc capacity. With only a 2GB card, a user could