The raw ISO contains a lot of "dummy data" (empty sectors used to push game data to the faster outer edge of a physical disc). A standard compression tool like WinRAR or 7-Zip can strip this dummy data, reducing the file from 4.37 GB to roughly .
Unofficial "highly compressed" links on forums often hide malware or unwanted software. Corrupt Files: sonic unleashed wii iso highly compressed
When looking for or creating a compressed version of Sonic Unleashed, you will likely encounter these specific file types: The raw ISO contains a lot of "dummy