PS2 games were already compressed on their discs. Further "high compression" (e.g., squeezing a 4.3 GB game down to 200 MB) usually means:
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If you are looking to save space for use with emulators like , the standard practice is converting the ISO to format. This typically reduces the size by about without losing game data. Performance Warning The PS2 version of Underworld PS2 games were already compressed on their discs