After the game is localized, the size of the game becomes smaller because the localization team will delete the junk data in the game ROM, and some data are even "burn-proof patches" that hinder the D version from running. So these data must be cleared. Why do game manufacturers get rid of a lot of junk data in the game before the game leaves the factory? That's because the capacity of UMD CD itself is 1.8 GB, and the game capacity is less than this value, so it is enough not to clean up the data. Manufacturers want to make a profit by listing games as soon as possible, so they ignore the step of cleaning up junk data. After "slimming game ROM", the screen of the game will not be affected, and the original plot of the game will not be deleted. On the contrary, because there is no junk data, the probability of bugs and stuck machines will be reduced. It's faster to chair a meeting.