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DVD-R DL
From Wikipedia, the free encyclopedia
| Optical disc authoring | |
|---|---|
| Optical media types | |
| Standards | |
DVD-R DL (DL stands for Dual Layer), also called DVD-R9, is a derivative of the DVD-R format standard. DVD-R DL discs employ two recordable dye layers, each capable of storing nearly the 4.7 GB (4.38 GiB) of a single-layer disc, almost doubling the total disc capacity to 8.54 GB (7.96 GiB). Discs can be read in many DVD devices (older units are less compatible) and can only be written using DVD-R DL compatible recorders.
| 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 |
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.
- Understanding Recordable & Rewritable DVD by Hugh Bennett
- DVD-R9 and DVD+R9 Hardware, Technologies and Standards by The DVD Insider
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