CDs are used for various purposes like storing audio, video, music, or data in different formats. CDs are generally manufactured in clean rooms, because they must be kept spotlessly clean for manufacturing. CDs are popular devices because they are an inexpensive way to store valuable information. They have become the standard medium for distributing large quantities of information. The great thing about CDs is that they are reliable, easy to produce, and cheap.

A CD is made of a simple piece of plastic about four one-hundredths of an inch in thickness. During the manufacturing process, the plastic is impressed with microscopic bumps arranged as a long spiral track of data. Once a clear piece of polycarbonate is formed, a reflective aluminum layer is laid on the disc, covering the bumps. A thin acrylic layer is then sprayed over the aluminum to protect it.

Every CD has single spiral track of data, circling from the inside of the disc to the outside, which explains the small size of the disc. You now have even baseball cards and business cards that can be put in a CD player. A CD business card can hold about 2 MB of data. The data track is incredibly small, about 0.5 microns wide, 0.83 microns long and 125 nanometers high. In fact, if you were to take the spiral track out of a CD and measure them, they would stretch for around 4 miles. A CD player has a disc reading mechanism which can read this incredibly small piece of plastic with data on it. CD manufacturing is getting sophisticated by the day, with the advent of newer technologies.

CD provides detailed information on CD, CD Duplication, CD Covers, CD Mastering and more. CD is affiliated with MP3 Download Software.

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