Uncompressed PS2 games often contain "junk data" or padding used to improve physical disc reading speeds, which is unnecessary for modern digital storage. Compressing these files can reduce their size by 40% to 50% on average. Top Compression Formats for 2026 The Ultimate ROM File Compression Guide - Retro Game Corps
An Emulator: PCSX2 is the gold standard for PC, while AetherSX2 (or its successors) is the go-to for Android. ps2 iso highly compressed high quality top
CHD (Compressed Hunks of Data): This is currently considered the best file type for PS2 ROMs. It significantly reduces file size while remaining a single-file format that most modern emulators can read directly without manual extraction. Uncompressed PS2 games often contain "junk data" or