Direct-to-video or 2013's "Sharknado". As DVDs gradually replaced VHS videocassettes, the term "direct-to-DVD" replaced "direct-to-video" in some instances. However, the word "video" does not necessarily refer to videocassettes; many publications continue to use the term "direct-to-video" for DVDs or Blu-ray discs. Both disc-based release types may also be referred to as "direct-to-disc". A new term sometimes used is "DVD premiere" (DVDP). Such films can cost as little as $20 million, about a third of the average cost of a Hollywood release. According to "Variety", "" sold a million copies in one week, despite retaining only two actors from the original trilogy.
Optical disc drive inexpensive, are suitable where read/write capability is required. Disc recording is restricted to storing files playable on consumer appliances (films, music, etc.), relatively small volumes of data (e.g. a standard DVD holds 4.7 gigabytes) for local use, and data for distribution, but only on a small scale; mass-producing large numbers of identical discs is cheaper and faster than individual recording. Optical discs are used to back up relatively small volumes of data, but backing up of entire hard drives, which typically contain many hundreds of gigabytes or even multiple terabytes, is less practical. Large backups are often instead made on