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The double-density compact disc (DDCD) is an optical disc technology developed by Sony and Philips using the same 780 nm laser wavelength as a compact disc.The format was announced in July 2000 and is defined by the Purple Book standard document. [1]
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 ]
DVD+R DL (DL stands for Double Layer) also called DVD+R9, is a derivative of the DVD+R format created by the DVD+RW Alliance. Its use was first demonstrated in October 2003. DVD+R DL discs employ two recordable dye layers, each capable of storing nearly the 4.7 GB capacity of a single-layer disc, almost doubling the total disc capacity to 8.5 GB.
The DVD Book also permits an additional disc type called DVD-14: a hybrid double-sided disc with one dual-layer side, one single-layer side, and a total nominal capacity of 12.3 GB. [60] DVD-14 has no counterpart in ISO. [49] Both of these additional disc types are extremely rare due to their complicated and expensive manufacturing. [60]
Double Density Compact Disc (DDCD) Magneto-optical disc; MiniDisc (MD) ... In the DVD format, this allows 4.7 GB storage on a standard 12 cm, single-sided, ...
HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM; High-Definition Versatile Multilayer Disc (HD VMD) ... DDCD (Double Density) – divided in three separate specifications:
Ultra Density Optical (UDO) 3D optical data storage; ... A double-layer DVD+RW specification was approved in March 2006 with a capacity of 8.5 GB. [58]
Comparison of various optical storage media. This article compares the technical specifications of multiple high-definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high-definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard.