"Highly compressed" games often achieve their small size through two primary methods: Dumping/Stripping

For PS3 games, "highly compressed" usually refers to using instead of loose "JB Folder" (Game Folder) formats to save storage space and improve compatibility. While some legacy formats like CHD or CSO work for older consoles, modern PS3 setups focus on efficient ISO creation and file management to bypass the 4GB file limit of FAT32 drives. Better Compression & Efficiency

Don’t settle for bloated ISOs. By embracing for single-player games and lossless 7z for online titles, you can store 3x more PS3 games in the same space. The tools and sources above have been tested by thousands of emulation enthusiasts—they deliver better performance, faster downloads, and zero visual compromises.

Highly compressed archives must be fully extracted first. You cannot run a .7z or .rar file directly on a PS3. So compression adds an extra, mandatory step.

, you can keep games in folder format to save the space that a "filled" ISO disc image might otherwise use. Tips for Better Performance