780:
the "inside" and the rim of the DVD as the "outside". Since dual-layer DVDs have two data layers, placed one on top of the other – Layer 0 (L0) and Layer 1 (L1), there are two ways in which these two layers may be written to - L0, inside to outside and then L1 inside to outside again (PTP), or L0 inside to outside and then L1 outside to inside (OTP). OTP is usually used for DVD-Video, to prevent the inherent delay that PTP involves: in PTP, the laser head moves from the outside edge of the DVD to the inside to start reading L1 when it reaches the end of L0. This results in the video skipping or freezing up for some time as the laser head repositions itself and the system waits to start receiving data again.
620:
28:
763:(OTP). In PTP mode, used for DVD-ROM, both layers start recording at the inside diameter (ID) with the lead-in and end at the outside diameter (OD) with the lead-out. Sectors are sequenced from the beginning of the first layer to the end of the first layer, then the beginning of the second layer to the end of the second layer. In
779:
A common misconception is that the disc spins first in one direction, and then another, either for PTP or OTP recording, when in fact DVD-Writers always spin a disc in the clockwise direction. A simpler way to understand what's written above is to think of the little hole in the centre of the DVD as
657:
drives. DL drives started appearing on the market during mid-2004, at prices comparable to those of existing single-layer drives. As of March 2011 DL media is up to twice as expensive as single-layer media. The latest DL drives write double layer discs at a slower rate (up to 12×) than current
739:
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
770:
For DVD-Video a variation of the technique is employed. DVD-Video is always recorded in OTP mode, but the video data is read from the beginning of the first layer towards the end of the first layer, when this ends (not necessarily at the end of the track) then reading is transferred to the second
743:
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 remain more expensive. The
775:
of the second layer. This means that the 'start' of the second layer may not have any recorded material present. This is to minimize the time that the video player takes to locate and focus on the second layer and thus provide the shortest possible pause in the content as the layer changes.
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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.
960:
740:
DVD players, up to several seconds. This caused some viewers to worry that their dual-layer discs were damaged or defective. Studios began listing a standard message explaining this pausing effect on all dual-layer disc packaging.
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capacity of a single-layer disc, almost doubling the total disc capacity to 8.5 GB. Discs can be read in many DVD devices (older units are less compatible) and can only be created using DVD+R DL and
753:
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1021:
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649:. 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
1052:
323:
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575:
603:
62:
907:
1062:
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reached by dual-layer media for both reading and recording speeds are still well below those of single-layer media.
570:
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297:
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layer, but the video data commences from the same physical location that the first layer ends back towards the
488:
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67:
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421:
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290:
104:
536:
1018:
483:
1036:
935:
1031:
624:
407:
276:
243:
435:
283:
52:
745:
589:
544:
400:
393:
902:
515:
494:
479:
269:
8:
764:
759:
729:
344:
79:
47:
520:
450:
386:
646:
255:
251:
1025:
709:
619:
140:
124:
120:
72:
1046:
502:
442:
1057:
428:
99:
42:
19:
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317:
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897:
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371:
313:
219:
215:
195:
152:
872:
725:
721:
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650:
510:
457:
352:
309:
191:
183:
136:
132:
128:
887:
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692:
357:
238:
231:
227:
207:
203:
164:
148:
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mode, the second layer is read from the outside of the disk.
717:
642:
380:
376:
337:
304:
262:
199:
179:
160:
108:
27:
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per disc, compared with 4.7 gigabytes for single-layer discs.
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Cupertino: Optical
Storage Technology Association, Apr. 2004.
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732:, while DVD+R DL was developed for the DVD+RW Alliance by
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DVD-R9 and DVD+R9 Hardware, Technologies and
Standards
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720:discs to store significantly more data, up to 8.5
324:High-Definition Versatile Multilayer Disc (HD VMD)
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751:There are two modes for dual-layer orientation,
999:Understanding Recordable & Rewritable DVD.
597:
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1032:JVC's April 2005 announcement on DVD+RW DL
1019:Double-layer DVD heats up standards battle
604:
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798:number of sectors for data (2,048 B each)
932:"Understanding Dual Layer DVD Recording"
618:
704:
576:High-definition optical disc format war
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415:Stacked Volumetric Optical Disk (SVOD)
298:China Blue High-definition Disc (CBHD)
959:. hometheaterhifi.com. Archived from
982:"Roxio Compatibility Forum Glossary"
1004:Bennett, Hugh. "DVD±RW DL—D.O.A.?"
736:and Mitsubishi Kagaku Media (MKM).
728:was developed for the DVD Forum by
13:
908:List of optical disc manufacturers
784:Recordable DVD capacity comparison
14:
1079:
1053:Audiovisual introductions in 2004
1012:
658:single-layer discs (up to 24×).
571:History of optical storage media
291:Holographic Versatile Disc (HVD)
26:
934:. BurnWorld.com. Archived from
1068:Optical computer storage media
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949:
1:
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684:12 cm, single/dual layer
277:Enhanced Versatile Disc (EVD)
284:Forward Versatile Disc (FVD)
7:
866:
436:Nintendo optical disc (NOD)
422:Fluorescent Multilayer Disc
401:Ultra Density Optical (UDO)
10:
1084:
270:Universal Media Disc (UMD)
641:, is a derivative of the
616:DVD Recordable Dual Layer
537:Apple ISO 9660 Extensions
345:Personal Video Disc (PVD)
1063:Optical computer storage
957:"DVD players benchmark"
804:nominal capacity in GB
543:Universal Disk Format (
408:3D optical data storage
387:Video Single Disc (VSD)
645:format created by the
627:
497:(layer jump recording)
63:Recording technologies
53:Optical disc authoring
988:on February 29, 2012.
622:
394:Magneto-optical discs
903:MultiLevel Recording
705:Dual-layer recording
760:opposite track path
754:parallel track path
730:Pioneer Corporation
695:, single/dual layer
623:A DVD+R DL disc by
139:), Super Video CD (
92:Optical media types
1039:by The DVD Insider
1024:2008-03-14 at the
628:
123:, Super Audio CD (
80:Burst cutting area
58:Authoring software
48:Optical disc drive
963:on March 13, 2008
930:Robert DeMoulin.
864:
863:
801:capacity in bytes
712:recording allows
702:
701:
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451:Professional Disc
358:MD Data, MD Data2
252:Mini Blu-ray Disc
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984:. Archived from
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491:(packet writing)
256:Ultra HD Blu-ray
244:BD-R & BD-RE
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633:(DL stands for
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121:5.1 Music Disc
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20:Optical discs
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1005:
998:
986:the original
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965:. Retrieved
961:the original
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940:. Retrieved
936:the original
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635:Double Layer
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131:, CD Video (
97:
43:Optical disc
1006:EMedia Xtra
655:Super Multi
370:LaserDisc (
1047:Categories
1028:- ZDNet UK
967:2008-04-01
942:2007-07-06
914:References
823:DVD+R (SL)
809:DVD-R (SL)
757:(PTP) and
710:Dual-layer
698:2.6 / 5.2
687:4.7 / 8.5
526:Rock Ridge
495:Mount Fuji
351:MiniDisc (
318:HD DVD-RAM
248:Blu-ray 3D
898:Book type
893:DVD+RW DL
854:4,173,824
840:4,171,712
826:2,295,104
812:2,298,496
795:Disk Type
773:beginning
722:gigabytes
693:8 cm
669:Capacity
551:ISO 13490
532:El Torito
471:Standards
314:HD DVD-RW
220:DVD-Video
153:CD-ROM XA
1022:Archived
873:DVD-R DL
867:See also
851:DVD+R DL
837:DVD-R DL
726:DVD-R DL
665:DVD+R DL
631:DVD+R DL
625:Verbatim
565:See also
511:ISO 9660
458:DataPlay
310:HD DVD-R
196:DVD+R DS
192:DVD-R DS
188:DVD+R DL
184:DVD-R DL
129:Photo CD
734:Philips
232:MiniDVD
228:EcoDisc
208:DVD-RAM
165:Mini CD
149:CD-Text
37:General
888:DVD+RW
639:DVD+R9
528:/ SUSP
516:Joliet
381:LV-ROM
377:LD-ROM
338:GD-ROM
305:HD DVD
263:M-DISC
204:DVD+RW
200:DVD-RW
161:MIL-CD
109:CD-ROM
883:DVD+R
718:DVD+R
714:DVD-R
643:DVD+R
521:Romeo
480:ATAPI
364:Hi-MD
331:VCDHD
216:DVD-A
212:DVD-D
180:DVD+R
176:DVD-R
117:CD-RW
105:CD-DA
860:8.5
846:8.5
832:4.7
818:4.7
716:and
445:(AD)
157:CD-i
145:CD+G
141:SVCD
125:SACD
113:CD-R
1058:DVD
878:DVD
765:OTP
545:UDF
484:MMC
477:SFF
224:HVD
171:DVD
143:),
137:VCD
133:CDV
127:),
1049::
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651:GB
379:,
374:):
372:LD
355:):
353:MD
316:,
312:,
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239:BD
230:,
226:,
222:,
218:,
214:,
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970:.
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598:t
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547:)
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307::
258:)
173::
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