I would cut the outer edges of the cdr off. Then i would put it in the saturn, and put an original saturn one on top of it. so every cd i make i would need to cut into a squarey shape. If the laser isn't strong enough maybe doing the read cdrw mod will make it strong enough?
the laser would not be able to focus on both discs, and you can't even put 2 CDs in without the top one falling/slipping, AFAIK. plus, do you really want to spend half a day per game carving it down to fit?
Someone on that forum points at the use of those smaller sized cd's, would it work if those are used? How many data can you possible store on those smaller sized cd's? I've never used them so I have no clue.
Well, i thought of this a long ass time ago, i butchered an extra copy of sega rally championship i had (i had 2), i did the outer ring thing, but reflecting on how long that took me to do, i simply said fuck this bs and bought a modchip, and the saturn engine can't spin two cd's very well at once anyways.
What you would really need to do would be both cut the outer bit of the copied game and the security ring off the official game and attach the copy to the inside of the ring. This way every thing is at the same height.
I'm pretty sure that the laser needs something to track while it's moving. I'm not familiar with the details, but during the security check there's a definite difference in the behavior of the reader between CD-Rs that use the entire disc and those that use only a smaller portion. The ones using the full disc behave almost normally, while the ones with a large unrecorded portion cause the drive to start doing odd things.