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.
Essentially, each is a recordable variation of the DVD format. They allow the recording of audio, video, data, etc. on DVD discs. DVD-R is a one-time recordable disc, similar to a CD-R. If used to record video, it should be playable on most DVD players. DVD-RAM, DVD-RW and DVD+RW are competing, rewriteable DVD formats. Each is backed by a group of major electronics manufacturers.