Actually, I think most had the code in track 2. Track 1 was an audio track warning you that the disc is only designed to a play on the system. More details at https://retrocomputing.stackexchange.com/questions/27518/did...
“This CD is made for the Turbografx game system. Please place it into the CD drive on your Turbografx to play.”
My brother and I thought this was really cool when we were kids. We thought the CD player must “know” that it’s a game.