DVD+R DL (Double Layer), also known as DVD+R9, is a derivative of the DVD+R format created by the DVD+RW Alliance. Its use was first demonstrated in October2003. 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 8.55 GB. Discs can be read in many DVD devices (older units are less compatible) and can only be created using DVD+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 ($2 to $10 USD per disc) is many times that of single-layer media. The latest DL drives write double layer discs slower (2.4x to 8x) than current 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. A DVD+R disc The title of this article is incorrect due to technical limitations. ... The DVD+RW Alliance is a group of electronic hardware, optical storage and software manufacturers who created and promote a format standard of recordable and rewritable DVDs, known as the plus format. ... October is the tenth month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days. ... 2003 (MMIII) is a common year starting on Wednesday of the Gregorian calendar. ... DVD Rewritable double layer format by Ricoh. ... Super Multi is a type of DVD recorder that writes DVD-R/-RW, DVD+R/+RW and DVD-RAM formats. ... The United States dollar is the official currency of the United States. ...
The Book Type is a field of four bits at the start of every DVD (in the physical format information section of the control data block) that indicates what the physical format of the disc is. ... DVD (sometimes called Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... A DVD+R disc The title of this article is incorrect due to technical limitations. ...
Since the DVD+R format is a competing format to the DVD-R format, which is developed by the DVD Forum, it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format.
In October of 2003, it was demonstrated that double layer technology could be used with a DVD+R disc to nearly double the capacity to 8.5 GB per disc.
There are a number of significant technical differences between the dash and plus formats, and although most consumers would not notice the difference, the plus format is considered by some to be better engineered.
DVD is an optical disc In computing, sound reproduction, and video, an optical disc is flat, circular, usually polycarbonate disc whereon data is stored.
By employing a red laser at 650 nm (was 780 nm) wavelength and a numerical aperture of 0.6 (was 0.45), the read-out resolution is increased by a factor 1.65.
DVD drives for computers usually come with one of two kinds of Regional Playback Control (RPC), either RPC-1 or RPC-2; This is used to enforce the publisher's restrictions on what regions of the world the DVD can be played.
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