The new 2.4x DVD+R media expands the data storage capacity from 4.7GB to a massive 8.5GB on a single side. This means that consumers will be able to record up to four hours of DVD-quality. Of utmost importance is the fact that compatibility is maintained with existing DVD video players and DVD ROM drives. Verbatim is an active member of the DVD+RW Alliance and this development clearly illustrates its desire and ability to work closely with hardware manufacturers.

The media uses technology developed jointly by Verbatim’s parent company – Mitsubishi Kagaku Media - and Philips. Both companies view the development and introduction of Double Layer technology as the next important milestones in the drive to continually improve and expand the optical data storage options available to consumers.

The development of reliable Double-Layer media is the key technology enabler for Double Layer DVD+R recording. The ultimate challenge was to develop materials and manufacturing processes for double-layer discs that allow the properties of two unique layers, once recorded, to meet the DVD 9 read only specifications for DVD-ROM drives and DVD video players. During recording and reading, each layer can be targeted without disrupting data on the other layer.

The first recording layer of the Verbatim DVD+R DL disc is semi-transparent, providing enough reflectivity for writing/reading data on the first layer, yet transmitting enough laser power to read/write on the second layer by refocusing the laser. In addition to optimising layer reflectivity, new AZO recording dyes were developed by MKM for each layer to optimise parameters such as signal amplitudes and power margins to ensure compatibility with current DVD standards.

‘Compatibility was a top priority in developing our Double Layer media’ says Ryuhei Sato, Verbatim Optical Director. ‘Content developers will be among the first to make the switch to Double Layer technology because multimedia and video files require so much capacity. They can increase their productivity with the 8.5GB DVD+R media without worrying about playback compatibility. It will be the same as their 4.7GB discs, just with more capacity.’

The media is targeted to ship in Summer 2004.
The media works with two recording layers; layer 0 has a special reflective layer that allows the laser to pass through it so it is able to reach the second layer (layer 1)