The main difference between DVDs and CDs is the amount of data stored on them. Data is stored in the form of patterns of pits in the surface of the metal film. So the spacing between rows of pits on DVDs is much smaller than on CDs. However the manufacturing process is nearly identically. Just like records, CDs and DVDs are made with an extreme precision molding process. The metal film is then applied to the premolded plastic disks and the a second protective layer of plastic is added. The last step is labeling.
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