ABSTRACT
Capacity We refer above to DVD ‘layers’ because the physical construction of a DVD is quite different from that of a CD. While a CD is always a single piece of moulded polycarbonate, DVD can be manufactured in at least four different physical variations, each with a different data capacity. All of these variations are made up of two polycarbonate platters (substrates) bonded back-toback. The finished thickness of these discs is the same as that of a CD, but the double-sided manufacturing technique increases the rigidity of the media and minimizes warpage.
