DVD+R DL (Double Layer), also known as 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. Discs can be read in many DVD devices (older units are less compatible) and can only be created using DVD+RW 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 slower (2.4x to 8x) than current single-layer media (8x-16x).

A double layer rewritable version called DVD+RW DL has been released but is expected to be incompatible with existing DVD devices.

See also

• Book type
• DVD
• DVD+R
• DVD-R DL
• DVD+RW DL

References

• Bennett, Hugh. Understanding Recordable & Rewritable DVD. Cupertino: Optical Storage Technology Association, Apr. 2004. ^*
• Bennett, Hugh. "DVD±RW DL—D.O.A.?" EMedia Xtra May 10, 2005. ^*

External links

• Understanding Recordable & Rewritable DVD
• 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

DVD

DVD+R DL | DVD+R DL