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 manufacture of a floppy disk takes place in three phases. First, the disk itself is made, then the case is made, and finally the two are assembled. The procedure for 8- and 5 1/4-inch disks differs slightly from that for the 3 1/2-inch model. Disk manufacture