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.
DVD-R stands for DVD recordable. DVD-R s the most universal of recordable DVD formats that is used by computer DVD writers as well as most DVD recorders. However, DVD-R is a write-once format, much like CD-R and discs made in this format can be played in most current DVD players. DVD-R discs need to be finalized at the conclusion of the recording process (like a CDR) before they can be played in another DVD player.