This article is missing information about dates. Please expand the article to include this information. Further details may exist on the talk page.(August 2020)
DVD-R DL (DL stands for Dual Layer[1]), also called DVD-R9, is a derivative of the DVD-R format standard. DVD-R DL discs hold 8.5 GB by utilizing two recordable dye layers, each capable of storing a little less than the 4.7 gigabyte (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.[clarification needed] 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. DVD-R DL media has been discontinued by most manufacturers. DVD+R DL is dominating the market for dual layered media.
Dual layer recordingedit
Dual Layer recording allows DVD-R and DVD+R discs to store significantly more data, up to 8.5 GB, 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 (formally known as Double Layer) was developed for the DVD+RW Alliance by Philips and Mitsubishi Kagaku Media (MKM).[3]
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 players, up to several seconds.[4] 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.
The stacked, shine-through arrangement of layers does come with a small increase in error rate due to reduced reflectivity of the written layers, and a similar small risk of crosstalk interference. One of the techniques employed to help compensate for these reliability shortcomings is a 10% increase in minimum mark (digital 0 or 1) length on the disc, with a corresponding 10% increase in rotation speed and 10% reduction in gross recordable capacity, accounting for the lower capacity of a single-sided dual-layer DVD at 8.5 billion bytes, versus a double-sized, single-layer DVD at 9.4 billion (for 12 cm discs). Detail differences in formatting and file structure mean the "usable" data area capacity does not change by exactly this much, but for all intents a DVD-R DL has effectively 20/11ths the capacity of a DVD-R SL, and the same holds for +R, commercially pressed, and 8 cm discs.
DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD-ROM drives.[3] 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 first layer ends. The two layers share one lead-in and one lead-out. Only blank disks and drives that support the latter mode are currently available.
Recordable DVD capacity comparisonedit
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.
^"Standard ECMA-382 120 mm (8.5GB per side) and 80 mm (2,66 G DVD Recordable Disk for Dual Layer (DVD-R for DL)". ecma-international.org. Retrieved 2008-10-29.
^Marshall, Dave (2001-10-04). "Sizes and capacities of DVD". users.cs.cf.ac.uk. Retrieved 2020-07-21.
^ abRobert DeMoulin. . BurnWorld.com. Archived from the original on 2010-04-21. Retrieved 2007-07-06.
^. hometheaterhifi.com. Archived from the original on March 13, 2008. Retrieved 2008-04-01.
External linksedit
DVD-R9 and DVD+R9 Hardware, Technologies and Standards by The DVD Insider
January 01, 1970
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This article is missing information about dates Please expand the article to include this information Further details may exist on the talk page August 2020 DVD R DL DL stands for Dual Layer 1 also called DVD R9 is a derivative of the DVD R format standard DVD R DL discs hold 8 5 GB by utilizing two recordable dye layers each capable of storing a little less than the 4 7 gigabyte 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 Contents 1 Capacities 1 1 Compatibility 2 Dual layer recording 3 Recordable DVD capacity comparison 4 See also 5 References 6 External linksCapacities editDVD R DL Capacity Physical size Nominal capacity in GB 109 bytes Typical capacity in GiB 230 bytes 12 cm single sided 8 5 7 96 12 cm double sided 17 1 15 91 8 cm single sided 2 6 2 7 2 47 8 cm double sided 5 3 4 94 2 Compatibility edit See also DVD recordable Adaption DVD R DL has compatibility issues with legacy DVD ROM drives known as pickup head overrun clarification needed 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 DVD R DL media has been discontinued by most manufacturers DVD R DL is dominating the market for dual layered media Dual layer recording editDual Layer recording allows DVD R and DVD R discs to store significantly more data up to 8 5 GB 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 formally known as Double Layer was developed for the DVD RW Alliance by Philips and Mitsubishi Kagaku Media MKM 3 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 players up to several seconds 4 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 The stacked shine through arrangement of layers does come with a small increase in error rate due to reduced reflectivity of the written layers and a similar small risk of crosstalk interference One of the techniques employed to help compensate for these reliability shortcomings is a 10 increase in minimum mark digital 0 or 1 length on the disc with a corresponding 10 increase in rotation speed and 10 reduction in gross recordable capacity accounting for the lower capacity of a single sided dual layer DVD at 8 5 billion bytes versus a double sized single layer DVD at 9 4 billion for 12 cm discs Detail differences in formatting and file structure mean the usable data area capacity does not change by exactly this much but for all intents a DVD R DL has effectively 20 11ths the capacity of a DVD R SL and the same holds for R commercially pressed and 8 cm discs DVD recordable discs supporting this technology are backward compatible with some existing DVD players and DVD ROM drives 3 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 first layer ends The two layers share one lead in and one lead out Only blank disks and drives that support the latter mode are currently available Recordable DVD capacity comparison editFor 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 2 048 B each capacity in bytes nominal capacity in GB 109 bytes DVD R SL 2 298 496 4 707 319 808 4 7 DVD R SL 2 295 104 4 700 372 992 4 7 DVD R DL 4 171 712 8 543 666 176 8 5 DVD R DL 4 173 824 8 547 991 552 8 5See also editDVD R DL DVD DVD R DVD RW DVD RW DL Book type MultiLevel Recording List of optical disc manufacturersReferences edit Standard ECMA 382 120 mm 8 5GB per side and 80 mm 2 66 G DVD Recordable Disk for Dual Layer DVD R for DL ecma international org Retrieved 2008 10 29 Marshall Dave 2001 10 04 Sizes and capacities of DVD users cs cf ac uk Retrieved 2020 07 21 a b Robert DeMoulin Understanding Dual Layer DVD Recording BurnWorld com Archived from the original on 2010 04 21 Retrieved 2007 07 06 DVD players benchmark hometheaterhifi com Archived from the original on March 13 2008 Retrieved 2008 04 01 External links editDVD R9 and DVD R9 Hardware Technologies and Standards by The DVD Insider Retrieved from https en wikipedia org w index php title DVD R DL amp oldid 1184824238, wikipedia, wiki, book, books, library,
