Ngl, i didn't know it was concentric circles. I always thought it was a spiral like a vinyl record.

Also the encode is pretty neat, I didn't know that.

I DID know about RWs being rewritable, and you could sort of brute force some supposedly single write discs.

To be clear, I wrote that to be as simple as possible like if a person read it who really didn't have any idea, they could have a relatively quick understanding in plain terms. Guess even I learned something today!