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Dual-layer recording allows DVD-R and DVD+R discs to store significantly more data, up to 8.5 gigabytes per disc, compared with 4.7 gigabytes for single-layer discs. DVD-R DL was developed for the DVD Forum by Pioneer Corporation, while DVD+R DL was developed for the DVD+RW Alliance by Philips and Mitsubishi Kagaku Media (MKM).
DVD-R DL (DL stands for Dual Layer [1]), also called DVD-R9, is a derivative of the DVD-R format standard. DVD-R DL discs hold 8.5 GB by utilizing two recordable dye layers, each capable of storing a little less than the 4.7 gigabyte (GB) of a single layer disc, almost doubling the total disc capacity. [ 2 ]
Some half-height DVD Multi Recorder drives released since 2007, such as the TSSTcorp SH-S203/TS-H653B (2007) have officially adapted support for writing speeds of up to 12× on DVD-R DL and 16× on DVD+R DL (on recordable media by selected vendors only), while more recent DVD writers such as the SH-224DB (2013) and Blu-ray writers such as the ...
A dual-layer Blu-ray disc (BD-R DL and BD-RE DL) has 50,050,629,632 bytes, which are 47,732 MiB. This is exactly twice the capacity, unlike dual-layer DVDs, which only have less than twice the capacity as single-layer DVDs.
In 1991, Verbatim released the world's first 3.5" magneto-optical disk. Verbatim started its successful foray into the optical disc market in 1993 with CD-R media. In 1997, Verbatim released the world's first CD-RW format media. In 2001, Verbatim released the world's first DVD+R format media.
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.