DVD-R DL
Encyclopedia
DVD-R DL also called DVD-R9, is a derivative of the DVD-R
format standard. DVD-R DL discs hold 8.54 GB (7.96 GiB) per side by utilizing two recordable dye layers, each capable of storing nearly the 4.7 gigabyte
(GB) (4.38 GB) of a single layer disc -almost doubling the total disc capacity. Discs can be read in many DVD devices (older units are less compatible) and can only be written using DVD-R DL compatible recorders. It is part of optical disc recording technologies
for digital recording
to optical disc
.
DVD-R DL has compatibility issues with legacy DVD-ROM drives known as pickup head overrun
. To avoid this issue, the two layers of the disc need to be equally recorded. But this is a contradiction with the sequential nature of the DVD recording. Thus DVD Forum under Pioneer's lead developed a technology known as Layer Jump Recording (LJR)
, which incrementally record smaller sections of each layer to maintain compatibility with DVD-ROM drives.
and DVD+R
discs to store significantly more data, up to 8.5 GB per side, per disc, compared with 4.7 GB for single-layer discs. DVD-R DL was developed for the DVD Forum by Pioneer Corporation
, DVD+R DL
was developed for the DVD+RW Alliance by Philips
and Mitsubishi Kagaku Media (MKM).
A Dual Layer disc differs from its usual DVD counterpart by employing a second physical layer within the disc itself. The drive with Dual Layer capability accesses the second layer by shining the laser through the first semi-transparent layer. The layer change can exhibit a noticeable pause in some DVD player
s, up to several seconds. This caused more than a few viewers to worry that their dual layer discs were damaged or defective, with the end result that studios began listing a standard message explaining the dual layer pausing effect on all dual layer disc packaging.
DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD-ROM drives. Many current DVD recorders support dual-layer technology, and the price is now comparable to that of single-layer drives, though the blank media remains more expensive. The recording speeds reached by dual-layer media are still well below those of single-layer media.
There are two modes for dual layer orientation. With parallel track path (PTP), used on DVD-ROM, both layers start at the inside diameter (ID) and end at the outside diameter (OD) with the lead-out. With Opposite Track Path
(OTP), used on DVD-Video, the lower layer starts at the ID and the upper layer starts at the OD, where the other layer ends, they share one lead-in and one lead-out. However only blank disks and drives that support the latter mode are currently available.
DVD-R
DVD-R is a DVD recordable format. A DVD-R typically has a storage capacity of 4.71 GB. Pioneer has also developed an 8.5 GB dual layer version, DVD-R DL, which appeared on the market in 2005....
format standard. DVD-R DL discs hold 8.54 GB (7.96 GiB) per side by utilizing two recordable dye layers, each capable of storing nearly the 4.7 gigabyte
Gigabyte
The gigabyte is a multiple of the unit byte for digital information storage. The prefix giga means 109 in the International System of Units , therefore 1 gigabyte is...
(GB) (4.38 GB) of a single layer disc -almost doubling the total disc capacity. Discs can be read in many DVD devices (older units are less compatible) and can only be written using DVD-R DL compatible recorders. It is part of optical disc recording technologies
Optical disc recording technologies
Optical disc authoring requires a number of different optical disc recorder technologies working in tandem, from the optical disc media to the firmware to the control electronics of the optical disc drive...
for digital recording
Digital recording
In digital recording, digital audio and digital video is directly recorded to a storage device as a stream of discrete numbers, representing the changes in air pressure for audio and chroma and luminance values for video through time, thus making an abstract template for the original sound or...
to optical disc
Optical disc
In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes binary data in the form of pits and lands on a special material on one of its flat surfaces...
.
| 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 MiniDVD MiniDVD is a DVD disc having 8 cm in diameter.The 8 cm optical disc format was originally used for music CD singles, hence the commonly used names CD single and miniCD... , single sided |
2.6 | 2.42 |
| 8 cm MiniDVD MiniDVD is a DVD disc having 8 cm in diameter.The 8 cm optical disc format was originally used for music CD singles, hence the commonly used names CD single and miniCD... , double sided |
5.2 | 4.84 |
DVD-R DL has compatibility issues with legacy DVD-ROM drives known as pickup head overrun
Overrun
Overrun may refer to:* Overrun brake* Overrun, the condition of a vehicle travelling without throttle, see freewheel** Overrunning clutch, see freewheel* Buffer overrun, see buffer overflow...
. To avoid this issue, the two layers of the disc need to be equally recorded. But this is a contradiction with the sequential nature of the DVD recording. Thus DVD Forum under Pioneer's lead developed a technology known as Layer Jump Recording (LJR)
Layer Jump Recording (LJR)
Layer Jump Recording is a writing method used for DVD-R DL .It permits recording the disc per increments called session , aka multi-session. It also permits a faster closing of the disc by saving extraneous padding when the amount of recorded data does not fill-up the disc...
, which incrementally record smaller sections of each layer to maintain compatibility with DVD-ROM drives.
Dual layer recording
Dual Layer recording allows DVD-RDVD-R
DVD-R is a DVD recordable format. A DVD-R typically has a storage capacity of 4.71 GB. Pioneer has also developed an 8.5 GB dual layer version, DVD-R DL, which appeared on the market in 2005....
and DVD+R
DVD+R
DVD+R is part of optical disc recording technologies. It is a format for optical disc data storage that utilizes digital recording. It is similar to, but incompatible with, the older DVD-R standard...
discs to store significantly more data, up to 8.5 GB per side, per disc, compared with 4.7 GB for single-layer discs. DVD-R DL was developed for the DVD Forum by Pioneer Corporation
Pioneer Corporation
is a multinational corporation that specializes in digital entertainment products, based in Kawasaki, Kanagawa, Japan. The company was founded in 1938 in Tokyo as a radio and speaker repair shop...
, DVD+R DL
DVD+R DL
DVD+R DL 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...
was developed for the DVD+RW Alliance by Philips
Philips
Koninklijke Philips Electronics N.V. , more commonly known as Philips, is a multinational Dutch electronics company....
and Mitsubishi Kagaku Media (MKM).
A Dual Layer disc differs from its usual DVD counterpart by employing a second physical layer within the disc itself. The drive with Dual Layer capability accesses the second layer by shining the laser through the first semi-transparent layer. The layer change can exhibit a noticeable pause in some DVD player
DVD player
A DVD player is a device that plays discs produced under both the DVD-Video and DVD-Audio technical standards, two different and incompatible standards. These devices were invented in 1997 and continue to thrive...
s, up to several seconds. This caused more than a few viewers to worry that their dual layer discs were damaged or defective, with the end result that studios began listing a standard message explaining the dual layer pausing effect on all dual layer disc packaging.
DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD-ROM drives. Many current DVD recorders support dual-layer technology, and the price is now comparable to that of single-layer drives, though the blank media remains more expensive. The recording speeds reached by dual-layer media are still well below those of single-layer media.
There are two modes for dual layer orientation. With parallel track path (PTP), used on DVD-ROM, both layers start at the inside diameter (ID) and end at the outside diameter (OD) with the lead-out. With Opposite Track Path
Opposite Track Path
Opposite Track Path is a term used in optical DVD technology, allowing fast switching from layer 0 to layer 1.A dual-layer DVD with Opposite Track Path means that layer 0 is written in a spiral track starting at the inside of the disc, whereas the layer 1 spiral starts at the outside of the disc...
(OTP), used on DVD-Video, the lower layer starts at the ID and the upper layer starts at the OD, where the other layer ends, they share one lead-in and one lead-out. However only blank disks and drives that support the latter mode are currently available.
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 dual-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
- DVD+R DL (Double Layer)DVD+R DLDVD+R DL 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...
- Book typeBook typeThe book type is a field of four bits at the start of every DVD that indicates what the physical format of the disc is...
- DVDDVDA DVD is an optical disc storage media format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. DVDs offer higher storage capacity than Compact Discs while having the same dimensions....
- DVD-RDVD-RDVD-R is a DVD recordable format. A DVD-R typically has a storage capacity of 4.71 GB. Pioneer has also developed an 8.5 GB dual layer version, DVD-R DL, which appeared on the market in 2005....
- DVD-RW DL
- MultiLevel RecordingMultiLevel RecordingMultiLevel Recording was a technology originally developed by Optex Corporation and promoted by Calimetrics to increase the storage capacity of optical discs. It failed to establish itself on the market...
External links
- DVD-R9 and DVD+R9 Hardware, Technologies and Standards by The DVD Insider