It was apparently hidden in the lead-in area, but I can't find any information on how it was encoded. Some sources say "a hidden sector in the lead in" but that doesn't seem right, as there is nothing physically stopping a DVD burner with custom firmware from writing a hidden sector.
The disk key is small (40 bits) and I'm suspicious it's actually encoded as wobble frequency [0], like the PS1's copy protection scheme.
Because CD/DVD burners can't write wobble. Blank CDs/DVDs ship with a pre-made wobble in the pre-groove, which the burners use to determine the absolute position of the write laser.
But you couldn't rip the copy protection signal (not that you needed to, it was a fixed 4 letter string, "SCEA", "SCEI", or "SCEE" depending on region)
Nor could you burn it onto a CD-R. It was there to prevent people from burning copies of games, not to prevent you from ripping the disc.
Of course, it was stupidly easy to bypass with a mod chip. They literally just sit there injecting the copy protection signal into the cd rom electronics, tricking it into thinking every single disc was blessed by Sony, burned or not.
Not needed for emulation. I never owned a PSX so I used EPSXE and whatever I got for the N64 in early 2000s. I jumped from a GB/NES in late 90's to a PC. It was like crossing a wormhole to another dimension.
In this era, console designers were't concerned about emulators or ripping games. They were entirely focused on preventing game duplication (especially with CDs being so easy to copy) and unlicensed games. And the PS1's copy protection makes an ok effort at being a roadblock to running non-sony discs.
In fact, the question of emulators wouldn't have been on the Sony engineers minds at all.
Because in 1994 (when the ps1 launched) there were no viable console emulators.
There were a few early prototypes, but they didn't produce 'playable results'. The first viable emulator (for any console) was arguably NESticle, released in April 1997. Things then moved rapidly, we see the first viable 16bit emulators in 1998.
It's notable that the PS2 doesn't have any protection against ripping games either. The Sony engineers would have been aware of emulators by this point, but they might have assumed that emulation would be stuck in the 8/16bit era for the foreseeable future.
So it must have been a huge shock for the first viable 32bit era emulators to come out in 1999. Connectix Virtual Game station (Jan 1999), UltraHLE (Also Jan 1999) and Bleem! (March 1999)
Yes.. that's right. We went from the first viable NES emulator to viable PS1/N64 emulators in under 2 years.
I'm guessing the PS2 was a little too close to it's March 2000 release date at this point to slap on rip protection, but the Gamecube and Xbox were released 18 months later, and both had time to implement disc encryption schemes.
By 1994-1995 only the spoiled kids got the PS1. Again, I was 8-9 in that era. Most people resorted to a Chinese NES clone in tons of places. You talk about story, I talk about experience. By 1997-1998, yes, tons of people got it because it was a cheap CD player too, cheaper than a dedicated music set with speakers. But it wasn't odd to find some kid with parents working in an office or working as teachers, so they would have a PC and a CD burner (and elder brothers in college with computers too).
A few years later, months before the PS2/GC era, even at DC times (and good PC games) some PSX games were still emulated because they had tons of value, such as JRPGs. And, again, ripping PSX games to play them in emulators without risking to scratch the CD's was the same task as ripping them to play the games with a modchip.
Also, technologically JRPG's and survival horrors were
nothing against Unreal engine based games so they paled
against Deus Ex for instance, but man, Parasite Eve
and Resident Evil looked good with just a bilinear
filter and they ran in a potato.
On being a shock, not much, because somehow in my mind the PSX games were closer in architecture to a PC than a Game Boy ROM emulated on a PC, which looked like black magic, ignoring how the hell the nerd brainiacs dumped the cartridge content (I had no concept of EE burned ROM's in the day, or cartridge dumpers via the serial cable) to a PC. For the PSX, well, it was easier for obvious reasons, CD's were CD's, and again the 'look' of PC games and the PSX looked similar, so maybe they shared similar technologies on drawing/rendering.
Ditto with the N64, that was a bigger shock. How the hell did they dumped the content of the cartridge? Later I knew about Debian Woody, a bit of C, the concept of libraries (not just DLL's under Windows) and that the N64 and PC's with Linux with OpenGL shared some design and the rest was story. I learnt more about computers trying to write some emulator myself in Perl back in the day and with GNU/Linux than in any school...
Also I loved TV tuners for a similar reason. I could dump teletext, dump the EPG from cable TV's even with just plain TV tuners (the decoded signal went vanilla into the PCI bus, so NXTVEPG worked in the same exact way) and so on.
And yes, I pirated TV channels for some brief time until everyone shared media in either DivX CD's and P2P networks.
The disk key is small (40 bits) and I'm suspicious it's actually encoded as wobble frequency [0], like the PS1's copy protection scheme.
Because CD/DVD burners can't write wobble. Blank CDs/DVDs ship with a pre-made wobble in the pre-groove, which the burners use to determine the absolute position of the write laser.
[0] *https://en.wikipedia.org/wiki/Wobble_frequency