When searching for "PS2 ISO files highly compressed full," keep these safety tips in mind:

If you want the best balance between file size and performance, you need to know these three formats: 1. CHD (Compressed Hunks of Data)

PCSX2 can read ISOs compressed into .gz format. While effective, it doesn't usually reach the compression levels of CHD. How to Compress Your Own PS2 ISOs

You don't always need to download pre-compressed files from sketchy websites. You can take a standard ISO and compress it yourself using or the chdman tool.

Originally popular for the PSP, CSO is also supported by some PS2 loaders. It works well but can occasionally cause stuttering in FMVs (full-motion videos) because the console has to decompress the data on the fly. 3. GZ (Gzip)

It is a "lossless" format, meaning the emulator reads it exactly like a full ISO. 2. CSO (Compressed ISO)

(usually bundled with MAME or available in PCSX2 forums). Place your ISO in the same folder as the tool.

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