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.
The difference in formats caused the companies to come together and set up standards for maintaining one type of format, which resulted in the formation of DVD. As prices of DVDs went down, it cause VHS tapes to become obsolete by offering better technology. There are also various different types of DVDs including DVD-ROM, DVD-R and DVD-RW, Blu-ray. When DVD players were created, they had backward capability, which allowed CDs to be read on them. However, many CD-players could not read DVDs, which meant that people would specifically have to go and buy these players.