Myth #1: The "bad blocks" found on early ps1 games were part of the protection.
Fact: Thhey were a red herring, and an artifact of the original mastering hardware
Myth #2: The protection data is stored in sectors that cannot be reached with a PC drive.
Fact: The protection is actualyl stored in the 2 sec pregap between the leadin and the first track.
Here's EXACTLY how psx protection works.
The pregap mentioned above is mastered with a WOBBLE in it's groove. The PSX's 3 beam pcikup can follow and detect the wobble. A normal reader will only see normal data there, but the psx will see a wobbly groove with a constant frequency and changinga amplitude. The amplitude changes form low to high and back form the basis of an encoding method that is used to encode the ASCII letters SCE(I/E/A) (japan/europe/american) over and over within those 2 seconds.
This protection is considered (still!) impossible to duplicate on a CDR. this is because 1) no software yet will let you control the initial pregap and let you write it raw, and even if it did 2) no burner will let you write a wobble, and also 3) CDR media includes it's own wobble in the pregroove, which is used for Absolutte Time In Pregroove (ATIP) this TIP is endoded into the roughly 22.05khz wobble by modulating it's frequency. Since no burner can obliterate the wobble, you're stuck. The onyl way to put the proper wobble on a disc is to master it on there. this is what the psx-change people did.
Note that this wobbel does not break any stanards. as far as a normal single beam cd reade is concerned, the wobble doesnt' even exist, as it will simply plow thru the center, and not see the edges of the wobble. ad a normal 3 beam reader will simply follow the wobble and see nothing out of the ordinary. but the psx has a special circuit that reads the wobble, an dinterprets the wobble code, shoving letters into the right place.
all modchips work by inserting the boot code, replacing what is being sent by the psx circuit at the right time.
Coudl a cd writer be made that could write a bootable psx cd? the answer is YES. but it woudl ahve to be able to destroy parts of the atip wobble in the pregap to produce the proper pattern of "wobbleon/wobbleoff"