An is a digital archive file that is an exact, sector-by-sector copy of an optical disc. In the case of the PSP, an ISO or CSO (a compressed version of an ISO) is a digital backup of a UMD (Universal Media Disc).
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Disconnect your PSP, navigate to the menu on the XMB (the main menu), scroll down to Memory Stick , and your games will appear just like official digital downloads. An is a digital archive file that is