What is the full form of CD
CD: Compact Disc
A compact disc is a flat, small-rounded recordable device which can store upto 700mb data. It has a diameter of 4.75 inch. It is portable, hence, they can be taken anywhere according to one?s need. We can run a CD uncountable time as its quality does not degrade with time and long last. CDs can store any type of data like audio, video, text, pictures, etc in digital format. The data is stored in the form of small notches on the disc and when the disc is played the data is read by a laser from an optical drive.
History
Credit of inventing a CD can’t be given to a single person, as every part of the CD has been discovered by different individuals. Although James Russell is the most attributed inventor of the CD. He discovered it in 1965 and the patent of CD was sold to the Sony and Philips Company which made it publicly on May 17, 1978 in Japan and by 1983 it further went on to US and Europe. The first CD was produced on 17 August 1982 at the Philips factory in Germany.
Manufacture
CDs are made from 1.2 mm thick polycarbonate plastic weighing about 16 grams. A thin layer of Aluminium is applied to the surface to make it reflective. The data transforms from the center and proceeds to the edge. A CD has two sides. One side is plane which tells us about the content of the CD and other side shines as it has the laser beam on it through which it can be read.
Replicated CDs are produced in bulk using Hydraulic Press.