DVD+R DL

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Image:DVD+RDL.JPG

A single DVD+R DL disc

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 8.55 GB (or 7.96 GiB). Discs can be read in many DVD devices (older units are less compatible) and can only be created using DVD+R 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 ($1 to $5 USD per disc) is many times that of single-layer media. The latest DL drives write double layer discs at a slower rate (up to 16×) than current single-layer media (up to 20×).

DVD+R DL	Capacity
Physical size	GB	GiB
12 cm, single sided	8.5	7.92
12 cm, double sided	17.1	15.93
8 cm, single sided	2.6	2.42
8 cm, double sided	5.2	4.84

A double layer rewritable version called DVD+RW DL has been released but is expected to be incompatible with existing DVD devices.

1 Recordable DVD capacity comparison
2 See also
3 References
4 External links

[edit] Recordable DVD capacity comparison

For comparison, the table below shows storage capacities of the four most common DVD recordable media, excluding DVD-RAM. (SL) stands for standard single-layer discs, while DL denotes the double-layer variants. See articles on the formats in question for information on compatibility issues.

Disk Type	number of sectors for data (2,048B each)	capacity in bytes	capacity in GB	capacity in GiB
DVD-R (SL)	2,298,496	4,707,319,808	4.7	4.384
DVD+R (SL)	2,295,104	4,700,372,992	4.7	4.378
DVD-R DL	4,171,712	8,543,666,176	8.5	7.957
DVD+R DL	4,173,824	8,547,991,552	8.5	7.961

[edit] See also

[edit] References

Bennett, Hugh. Understanding Recordable & Rewritable DVD. Cupertino: Optical Storage Technology Association, Apr. 2004. [1]
Bennett, Hugh. "DVD±RW DL—D.O.A.?" EMedia Xtra May 10, 2005. [2]