DVD+R DL
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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.
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 |
See also
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]
External links
- Double-layer DVD heats up standards battle - ZDNet UK
- Understanding Recordable & Rewritable DVD by Hugh Bennett
- The Dual Layer DVD Recordable
- DVD+R DL Playback Compatibility Report, Part Two
- DVD+R DL Playback Compatibility Report, Part One
- JVC's April 2005 announcement on DVD+RW DL
- DVD-R9 and DVD+R9 Hardware, Technologies and Standards by The DVD Insider