Computer Accessories

How does a CD hold information?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. CDs, or compact discs, store music and other files as digital information represented as a series of ones and zeros. These ones and zeros are etched into a CD as a continuous track of millions of bumps and flat areas. The track begins at the CD's center and spirals out toward the outer edge. A CD player passes a laser over the track from the center of the disc to its edge to detect the bumps and flat areas. When the beam hits a flat area, the laser reflects onto an optical sensor and reads it as a one. When the beam hits a bump, it reflects away from the sensor, which it reads as a zero.

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