What does CD Stand for

Compact Disc

CD stands for Compact Disc compact disc –, in free translation for the Portuguese. This is one of the most popular digital data storage media, especially music and software, in which case the CD gets its name from CD-ROM. The technology, invented in 1979 and sold from 1982, is similar to that of the DVD.

In the late 1980 and early 1990, the Compact Discs have improved considerably the durability, providing more capacity and sound clarity, without noise. Rose so the popularization of ‘ Virgin ’ discs (CD-R), for just a recording, and the disks that can be reused, erasing and rewriting the content (CD-RW).

With the use of CDs, floppy disks have become obsolete – while a disk stores 700 MB, the disk only has a capacity of 1.44 MB. Another point in favour of the CDs was the fact that the corrupt or damaged disks very easy. If exposed to heat, cold, and even the magnetic field devices, such as cell phones, the storage device used to not support.

A CD contains four layers: the first is the label or adhesive layer; the second is a layer of acrylic, which stores the data itself; the third is a reflective layer composed of aluminum and the fourth is a plastic layer, made of polycarbonate. The silver is the result of the sum of recording layers and reflection. Already in a CD-R, the composition of the layers is different, so the disc can be recorded using a PC.

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