DVD+R DL (Double Layer), also known as DVD+R9, is a derivative of the DVD plus R format created by the DVD plus 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 of a single-layer disc, almost doubling the total disc capacity to 8.55 GB. Discs can be read in many DVD devices (older units are less compatible) and can only be created using DVD plus RW DL and Super Multi drives.
DL drives started appearing on the market during mid 2004, at prices comparable to those of existing single-layer drives. However, the price of DL media ($4 to $7 U.S. Dollar per disc) is many times that of single-layer media. The latest DL drives write double layer discs slower (2.4x to 8x) than single-layer media (8x-16x). A double layer rewritable version called DVD+RW DL is also in development but is expected to be incompatible with existing DVD devices.
=See also=
Book type
DVD
DVD plus R
= References =
Bennett, Hugh. Understanding Recordable & Rewritable DVD. Cupertino: Optical Storage Technology Association, Apr. 2004. [http://www.osta.org/technology/dvdqa/]
Bennett, Hugh. DVD±RW DLD.O.A. EMedia Xtra May 10, 2005. [http://www.emedialive.com/Articles/ReadArticle.aspxArticleID=9913]
=External links=
[http://www.osta.org/technology/dvdqa/ Understanding Recordable & Rewritable DVD]
[http://www.cdfreaks.com/article/129 The Dual Layer DVD Recordable]
[http://www.emedialive.com/Articles/ReadArticle.aspxArticleID=9102 DVD+R DL Playback Compatibility Report, Part Two]
[http://www.emedialive.com/Articles/ReadArticle.aspxArticleID=8568 DVD+R DL Playback Compatibility Report, Part One]
