A: Thomas Paine believed that the American army would become the strongest in the world, that America would achieve independence from Britain with a strong ar... Full Answer > Filed Under:
How DVDs Work. DVDs are of the same diameter and thickness as CDs, and they are made using some of the same materials and manufacturing methods. Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic.
CDs and DVDs are generally made using some of the same materials and manufacturing methods, with the major difference being the data capacity between the two. CDs and DVDs are made using polycarbonate plastic, which is approximately four one-hundredths (4/100) of an inch or 1.22 mm thick.