The "magic" wasn't actually magic; it was digital surgery. Groups of dedicated modders and "rippers" discovered that PS2 discs were often padded with "dummy files"—huge chunks of zeroed-out data used to push the actual game data to the outer edge of the physical disc for faster reading.
PCSX2 and others require correct file offsets. Overly compressed or modified ISOs often crash, freeze, or fail to boot. highly compressed ps2 iso
Most modern PCs handle CHD/CSO decompression with zero impact on gameplay. The "magic" wasn't actually magic; it was digital surgery
RECOMPRESSION COMPLETE. SAVING AS: LEO.BIN. Overly compressed or modified ISOs often crash, freeze,
Originally popular for the PSP, this format is widely supported by PS2 loaders like OPL (Open PS2 Loader) . It offers decent compression ratios while remaining playable.
. This is primarily achieved through specific file formats that eliminate "padding" (empty data) or by stripping non-essential game assets like cinematics. Common Compression Formats