Well, I also know that the grooves start close to the periphery of the disk and only ends close to the center
I know they have grooves on the disc so that sound can be played.
Are you familiar with phonograph records? I've never heard of them. Yes, I have heard of them. They are a medium to store analog sound which is known as Gramophone in British english, did you know about that ? I had no idea. What else do you know about them?
The groove usually starts near the periphery and ends near the center of the disc.