Since playing recorded Video DVDs is allowed on the PS2 as the machine does no other check on the media, the CDVD drive gives green light to the disc as a supported disc. What ESR does is patch the ISO image of the game to include two different data sessions or tracks, the first one, and the one that is immediately accessible to the CDVD drive is a dummy track that resembles that of a Video DVD, fooling the CDVD drive into thinking that a Video DVD has been inserted. The standard format used for DVDs on the PS2 is UDF (Universal Disk Format), which greatly supports multi-session discs.
The way ESR plays backups is by taking advantage of two of the main selling points of the PS2: its DVD drive and its ability to play Video DVD. ESR is always used in conjunction with FMCB: FMCB loads ELF files like ESR and ESR loads backup games.
ESR is an application that lets you play certain PS2 backups without modifying the system as long as these backups are specially patched.
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