How the Humble Compact Disc Works. by Michael Eiser

867 Words3 Pages
How the humble Compact Disc works.
By Michael Eiser
The humble compact disc has served for many generations and is evolving to store more data and provide more uses. In this article we will discuss how a CD is written, stores data and how the data is replayed.
To begin with a CD has been made so useful due to capability to secure large amounts of information in such a way that it is usable for many different things. From military storage of data, to simple home entertainment, the common CD is much more prevalent than ever.
When a CD is placed into a drive we know that it plays many different things for us upon our computer screen. However the process is not all that simple. The original CD that has not had any information installed yet has already been equipped with small lines on the CD itself. These lines go along the disc and spiral away from the center, guiding a laser across a very fine area along the CD. A depiction of the spiral is shown in figure 1.

Figure 1, spiral away from center of a disc. This thin line if stretched out would measure approximately 8 kilometers. When the CD has had data stored upon it there are a series of bumps and pits within these strands as seen in figure 2. Each bump and pit is the form of data stored on the disc. The computer reads these alterations on the disc as either one or zero. Or is in the form of Binary Code

That is the summary of how a compact disc is looks visually, but how is data stored upon it? Initially there are

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