In recordable and rewritable media, most of the stamper is composed of grooves, not pits and lands. Grooves are produced in recordable discs in location of the conventional pits and lands uncovered in replicated discs, and the two can be built in the same exposure course of action. Hd-DVD is made in the exact way as DVD. In DVDs, the similar processes as in CDs are carried out, but in a thinner disc.