In the category rules what is FDS and why is it not allowed on PS2?

Fast Disc Speed. Basically the PS2 uses something that allows it to "speed up" the speed of the disc. Making some things load faster but can lead to breaking other things. In one persons test it broke cutscenes etc. But another person (I believe it's been a while) said their cutscenes and audio weren't affected so it could have been a bad disc or console for the other as well. If basically all it does is make load times faster it would be the optimal way of playing this loading simulator lol.