How data is stored in optical storage ?

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How data is stored in optical storage?

The bits ( 0 and 1) are encoded as transitions between raised ridges (reflective area) and etched pits, which are lined up in a spiral like pattern. CD surface is covered with a super thin coating of reflective metal (usually aluminum or gold) and a label.

To read the data, an infrared laser is beamed through the CD's polycarbonate substrate. The wavelength of light that bounces off the mirror-like reflective backing is then measured. A pit scatters the light and the ridge reflects the light. Since pits and ridges pass different amounts of light, and translated back into the original ones and zeros.

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