A standard PS2 ISO is a direct 1:1 copy of the game disc. However, a version uses software like WinRAR or 7Zip to shrink the file size significantly.
: Supported natively by PCSX2. It builds an index for instant loading so there is no speed difference compared to an uncompressed ISO. CSO (Compressed ISO) ps2 highly compressed games free download exclusive
Is Downloading Retro Video Game ROMs Ever Legal? - How-To Geek A standard PS2 ISO is a direct 1:1 copy of the game disc