Double-layer recording technology--designated DVD+R 9--is based on double-layer technology that has been used for many years in DVD video applications. The media uses the same dye-based optical-recording technology as single-layer media but incorporates new design improvements to facilitate recording and playback from two layers.
The additional capacity provided by double-layer DVD is attractive for compliance with federal regulations, such as HIPAA and Sarbanes-Oxley, which require company records to be stored in a write-once, read many (WORM) format. Once recorded, a DVD+R cannot be altered or changed.
The new double-layer DVD+R media is supported by double-layer drives from several leading hardware vendors. Many of the new drives are multi-format models that can record not only on double-layer media, but also with single-layer DVD write-once and rewritable media. After a disc has been recorded, it can be played back on any DVD double-layer drive, DVD-ROM, or DVD video player, according to Maxell.
Maxell's double-layer DVD+R media will be followed by a double-layer DVD-R product scheduled for availability in the third quarter of 2005. Rewritable double-layer media products--both DVD+RW and DVD-RW--are expected to be available during the second half of 2005.