On a modern emulator like PCSX2, that padding was dead weight. Leo's fingers flew across the keys as he initiated his tools of the trade:

An older format often used for PSP games but supported by some PS2 software like MaxCSO .

: Supported by PCSX2; it builds an index on the first load so there is no speed penalty during gameplay. How to Use Highly Compressed ISOs PS2 Android emulator Play! Setup Guide