The ISO (disc image) is your target. The original UMD dump is roughly 320 MB. Since the PSP Go has 16 GB internal storage, you can easily store it alongside dozens of other games.
: Use the 16GB internal storage for faster read speeds compared to M2 cards. All Star Yakyuken Battle Psp Go Custom
Ryota smiles, not remembering why it matters—but feeling that it does. The ISO (disc image) is your target