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.
A full sized CD/DVD label measures approximately at the disc's 4.65 diameter with a 40mm, 22mm or 17mm diameter hole cut from the center. Though smaller in size, business card CDs and DVDs as well as mini CDs and DVDs maintain the 40mm, 22mm and 17mm center holes, however their actual disc dimensions are less uniform. A 40mm, 22mm and 17mm center-holed mini CD or DVD will have a label with a diameter of 3.0625. A 61 mm Business Card CD or DVD label with a 22mm center hole will measure approximately 2.32 between flat edges and 3.08 between rounded edges.