DVD+RW Alliance demonstrates dual-layer DVD+R
Philips will demonstrate its new dual-layer DVD recordable technology at the
DVD+RW Alliance booth at the CEATEC JAPAN 2003 exhibition. Developed by Philips
Research in cooperation with MKM (Mitsubishi Kagaku Media)/Verbatim, the technology
virtually doubles data storage capacity on DVD recordable discs from 4.7 Gbyte
to 8.5 Gbyte while remaining compatible with existing DVD Video players and
Users will benefit from the additional storage capacity of the DVD+R disc as
it will enable them to record 4 hours of DVD-quality video or 16 hours of VHS-quality
video, without the need to turn over the disc. PC users will be able to archive
up to 8.5 Gbytes of computer files on a single disc, which almost doubles the
storage capacity compared with the 4.7Gbytes for the single-layer DVD+R discs
currently available. The dual-layer DVD+R system uses two thin embedded organic
dye films for data storage separated by a spacer layer (see figure). Heating
with a focused laser beam irreversibly modifies the physical and chemical structure
of each layer such that the modified areas have different optical properties
to those of their unmodified surroundings. This causes a variation in reflectivity
as the disc rotates to provide a read-out signal as with commercially pressed
Initial investigations were started by Philips Research around 2 years ago
at a time when there was general scepticism throughout the optical storage industry
that compatible dual-layer DVD recordable would ever be possible. Developments
since then, initially by Philips and later in cooperation with media manufacturer
MKM, have dispelled this scepticism and the new dual-layer DVD+R technology
is now fully endorsed by the DVD+RW Alliance.
The DVD+RW Alliance is setting an aggressive feature and performance roadmap,
and the dual-layer DVD+R format book is expected to be ready within this year.
Recorders for both the PC and consumer electronics markets are expected to become
available during the course of 2004.
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