How do CDs, DVDs Blu-Ray disks etc store information inside them?

Question

I know that the information gets in via a red lazor (except for in blue ray, that have a blue thin lasor)

Answer 1

The laser burns 'pits' or dents into the disc. The reading laser is then fired onto the surface of the disc and a lens checks the refection back. If the lens hits a pit/dent the light is scattered more than an area without a pit/dent so the player can then determine if a pit/dent was present. Where it sees a dent is sees that as 1 and no dent it sees it as a 0 - this is the binary code used in computers.

For CD's a 'weighting' system is used for the digital / analogue converter to convert the binary 0's and 1's into analogue sound used to drive your speakers (via an amplifier)

Answer 2

the very basic explanation is that the laser burns microscopic spots onto a layer of substrate capturered inside a plastic shield (the tope and bottom of the disc) - the burned spots are darker than the surrounding material - data is stored as "1"'s and "0"'s - as the laser later reads the disc it sees "light" or "dark"spots on the disks or the "1"'s and "0"'s

Answer 3

they get burn't pretty much, a lazer burns slight dents in them and that's how the word burning comes from (copying), sdon't know the complete teachnical way but that's pretty much how it works.