It's on PS1 emulators to be specific, original CDs.
Scanned one of the games and it came out more or less entirely green, with 0.1% yellow (it's slightly scratched so I guess that's why?).
I had a look at MCSE earlier but I didnt quite understand it, I'll have another look.
Edit: Seems to have helped slightly but the problem is still there. I guess it's just a problem with the emulators rather then the drive, I guess I'll just have to deal with making ISOs for my games. Thanks again.