Where does the music,pictures and data actually go when you burn a cd/dvd, on the bottom surface or inside it?

Answer 1

The data goes inside the cd, closer to the top surface than the bottom surface. To the eye, it looks like the bottom surface holds the data, but that's just an optical illusion. The bottom surface and middle is merely a clear plastic disk. The data is actually on the underside of the thin top coating.

Next time you throw away a CD-R, scratch the top layer with the tip of a pair of scissors or a screw driver. You'll see that after you scratch off the thin top layer all that's underneath is a thick clear plastic disk. And, even though the clear plastic disk is flat, it's called the lens.

Answer 2

A CD/DVD is a "sandwich". The "media" is "laminated" in the plastic "case". The write laser head shines through the plastic and "burns" microscopic "pits" in the metal sheet. These are laid out in concentric circles and emulate a "square wave" shaped pattern. Where there is a pit a logical 1 is recorded (and later read back) and where there is no pit, the "beam" is scattered and, on read, comes back as a logical 0.

Answer 3

It actually burns straight through it, so inside and outside...if you hold it up to light sometimes you can see where the burns circles are :p

Answer 4

its etched on the platinum coating on the CD