Later Fat models and almost all Slim models removed the PS2 hardware to cut costs. Officially, these consoles cannot play PS2 discs. However, the PS3 architecture is powerful enough to emulate the PS2 via software. This capability was locked away by Sony but has been unlocked by the homebrew community.
Even with perfect files, errors happen. Here are the fixes: Ps2 Games Pkg For Ps3
Before diving into the "how," it is essential to understand the "what." Later Fat models and almost all Slim models
While PKG files are tidy, they are time-consuming to create. If you have a large library of games, converting every single one to a PKG on a PC is tedious. This is where the ISO method shines. This capability was locked away by Sony but
Sony originally released "fat" PS3 models with the Emotion Engine chip inside, allowing them to play PS2 discs natively. But as cost-cutting measures took hold, Sony removed this feature. For millions of users with later Slim and Super Slim models, their PS2 physical discs became expensive coasters.