| Format | What It Is | Compression Potential | |--------|------------|----------------------| | | A raw, bit‑for‑bit copy of a Blu‑ray disc. | Very large (up to 50 GB). Can be stored in a compressed archive, but RPCS3 cannot read compressed ISOs directly. | | PKG | A package format used for PSN digital games. | Already somewhat compressed by Sony; can be further compressed with tools like rom-organizer . | | Folder / JB format | The extracted contents of a game (disc or PKG). | Offers the most flexibility because you can compress individual asset files. |
Interestingly, the phrase "PS3 games highly compressed work" is evolving. PC gamers using the can now run compressed .zip files directly because the emulator has built-in decompression hooks. ps3 games highly compressed work
— many PS3 games already store their assets in compressed archives (often .psarc files) that the console decompresses on the fly. Some repackers modify these archives to use even higher compression ratios, potentially shrinking the final install size further. | Format | What It Is | Compression