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.
Blu ray and dvd are both optical discs. Nearly identical in size, blu ray discs and dvdâs have remarkably different storage capacities. A single layer dvd disc can hold approximately 4.7 gigabytes of data while a single layer blu ray disc of basically the same size can hold approximately 27 gigabytes of data.