I'm not even sure what you mean by "PS2 media".
Originally Posted by angelwolf71885
An HDD in a PS2 is a form of PS2 media, an MC is also a form of PS2 media, and so is a USB drive when it is connected to a PS2. Anything you can read some file from or write some file to using a PS2 console is some form of PS2 media.
I assume that you here use the term "PS2 media" to mean a pressed DVD disc holding an original PS2 game. So that is the assumption I will base my reply on.
for example i copy my game from PS2 media to DVD-r media
No. And a full '1 to 1' copy is impossible, for several reasons. An original pressed discs contains readable fields that lack a writable equivalent on a burnable disc, and there is also no way to hide the fact that the disc is a burnable type from the CDVD mechacon in the PS2, which is the unit that either permits or forbids further access to a disc by the PS2 programs (games or homebrew).
will it just work?
That is in fact what ESR uses to its advantage, as the ESR patch camouflages the disc so as to make it appear to be (as far as the mechacon bothers to check) a disc containing material of the only kind for which the mechacon will permit a DVD-R disc to be used, namely a DVD-Video movie.
The ESR patch modifies the UDF section of the disc, which is what the mechacon checks, to make it appear exactly as a very small DVD-Video movie. The mechacon then allows programs (such as the ESR driver) to access the disc, in the belief that it is just a movie backup, even though the ISO9660 section of the same disc still contains all the game files. This in itself would not quite suffice to make the game run, as that still requires access to the original (now hidden) UDF content, which is therefore provided by the ESR driver, since this knows how that content was hidden. So with the ESR driver active, all high-level parts of the system will see the disc as identical to the original game disc, with only the low-level mechacon believing that the disc is a DVD-Video movie.
In addition to this, some very few programs, such as FMCB and uLE contain special code to identify if a disc in tray is ESR-patched or not, so as to decide whether or not to invoke the ESR program when a disc is to be booted.
This is how the ESR method of running backups really works (minus the really deep techie details, which I will not even try to speak of here).
ESR is never 'automatically' invoked unless you have some software running that is able to invoke it (such as FMCB when booting, or uLE when using its "PS2Disc" command), and it is then that software that does the detecting, and decides whether to start ESR. (ESR itself has no way of doing it. It is not running at that time.)
or dose ESR come into play automatically if it detects an ESR patched disk?
This is not just a case of memory patching, but without going into deeper details it is essentially correct that a modchip does have the bios/FW (and some hardware) 'by the balls' as you say. These methods have absolutely NOTHING in common with ESR.
on chiped consoles or do they just do the memory patching on the fly because they already have the bios/FW by the balls? IE because a mod chip is a memory injection device
No. ISOs installed for HDL are not inherently patched, unless the user does so before installing, to get around some incompatibility problem of HDL. The patch work of HDL is done dynamically at runtime, when it emulates a CDVD driver and interferes with many other operations to prevent the game from reloading various driver modules (which would kill HDL). This patching affects only in-memory data or file buffers, so it has nothing to do with ISO patching.
also dose HDL apply patches?
Some games need various patches, but this is not in any way related to ESR patches.
or do they have to be patched even if backed up/installed with HDL?
Best regards: dlanor