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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]
A specification for dual-layer DVD-RW discs with a capacity of 8.5 GB (8,500,000,000 bytes) was approved by the DVD Forum, [56] and JVC announced their development of the first media in the format in 2005. [57] A double-layer DVD+RW specification was approved in March 2006 with a capacity of 8.5 GB. [58]
A standard single-layer DVD can store up to 4.7 GB of data, a dual-layer DVD up to 8.5 GB. Variants can store up to a maximum of 17.08 GB. [11] Prerecorded DVDs are mass-produced using molding machines that physically stamp data onto the DVD. Such discs are a form of DVD-ROM because data can only be read and not written or erased.
DVD-RW: rewritable DVD defined by DVD Forum; DVD+R: WORM DVD defined by the DVD+RW Alliance; DVD+RW: rewriteable DVD defined by DVD+RW Alliance; DVD-RAM rewriteable, capable of random write access, not generally format-compatible with DVD; Blu-ray Disc: DVD successor, capable of high-definition video [1] BD-R: WORM Blu-ray Disc by the Blu-ray ...
In contrast, the Xbox 360 utilized standard dual-layer DVDs with a capacity of 8.5 GB, and its optical drive ran at a 12× speed multiplier (16.5 MB/s). This meant that the Xbox 360 could deliver data transfer rates approximately 85% faster than the PlayStation 3. [ 10 ]