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DVD-RAM (DVD Random Access Memory) is a DVD-based disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders and personal video recorders since 1998.
This list includes both CD, DVD and Blu-ray recordable and rewritable media manufacturers (like Ritek), and disc replicators (companies that replicate discs with pre-recorded content, like Sony DADC).
According to the Optical Storage Technology Association (OSTA), "Manufacturers claim lifespans ranging from 30 to 100 years for DVD, DVD-R and DVD+R discs and up to 30 years for DVD-RW, DVD+RW and DVD-RAM." [105]
The primary advantage of DVD-RW over DVD-R is the ability to erase and rewrite to a DVD-RW disc. According to Pioneer, DVD-RW discs may be written to about 1,000 times before needing replacement. [7] There are three revisions of DVD-RW known as Version 1.0 (1999), Version 1.1 (2000) and Version 1.2 (November 2003). [8]
CD-R, DVD-R, and DVD+R discs receive the dye layer after pressing but before metallization. CD-RW, DVD-RW and DVD+RW receive a metal alloy layer sandwiched between 2 dielectric layers. HD-DVD is made in the same way as DVD. In recordable and rewritable media, most of the stamper is composed of grooves, not pits and lands.
DVD-RW represents a DVD "-" disc which can be read or written many times BD-RE represents a Blu-ray disc which can be read or written many times. In addition some of these media support MultiLevel Recording formats, for example dual layer (written as "DL"), and DVD also supports a "RAM" version (similar to RW), although this is not widely used ...
In 2009, Panasonic introduced the world's first Blu-ray disc recorder which was capable of recording both DVDs and Blu-ray discs and featured built in satellite HDTV tuners. A year later, Panasonic introduced Blu-ray disc recorders with terrestrial HDTV tuners. DVD recorders have technical advantages over VCRs, including: [citation needed]
Phase-change Dual (or Phase-change Disc) is a rewritable optical disc and a standard for it, developed by Matsushita Electric Industrial Co., Ltd. in April 1995. It has a capacity of 650 MB on one side, and the size of the disc is 12 cm in diameter (5 inches) similar to a general CD or DVD, and it is used in a state where it is housed in a ...
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