Umd stands for Universal Media Disc. It is a cd which the psp uses. All legimitate games are placed and ran in a UMD. Unlike computer games, the psp can run the game on the UMD itself without the use of installing it 1st. Usually UMD's contain games however there are also movie UMD's. They are not very common however, because the movies can be easily ran from the memory stick after it's format has been changed.

UMD's are required in order for games from the memory stick to work. In this case, any UMD will do because the Memory stick only needs a UMD inserted in the UMD slot of the psp.

External Links

UMD Dumper Copy UMD to ISO
UMDGEN 4.00 for remastering ISO you rip

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