a pc can't read umd disks the games are on, only some special umd readers can. a psp's already equipped with an umd reader, but with just original firmware you can't access the game disk any way other than to play it.
you need custom firmware on your psp to convert the umd into iso file and copy it to memory stick/pc.
you need custom firmware on your psp to convert the umd into iso file and copy it to memory stick/pc.