Swap Magic is a pressed disc that the PS2 recognizes as legit (how they managed to press PS2 discs is beyond me, but unofficial pressed discs have been existing since the PS1 era). Once the PS2 verifies the disc, it starts by loading the ELF file pointed to by a SYSTEM.CNF file inside the disc, from there on the game has the ability to do whatever it wants, as there's no real Operating System, the game runs on bare metal, the only check the PS2 does from now on is on the laser sensors (which vary depending on the model) to know if the tray has been opened or not. PS2 games have the ability to load ELF files inside the disc, as long as the inserted disc is verified.
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