|
TOKYO--(BUSINESS WIRE)--June 23,
1999--The DVD Forum today announced that its Steering Committee
has formally approved the physical format of the DVD-RAM disks for
4.7 gigabytes (GB) as version 2.0. The Format Book for version 2.0
(Physical Specifications) will be published in the third quarter
of this year.
The physical format is the
essential part of the 4.7GB DVD-RAM specifications. The 4.7GB
DVD-RAM format will be compatible with the existing 2.6-gigabyte
(version 1.0) DVD-RAM format as well as with other DVD formats
established by the DVD Forum. The new 4.7-gigabyte format is
expected to expand PC and audio-visual applications as well as
other future applications.
The Working Group 5 of the DVD
Forum, the body responsible for DVD-RAM format, started
formulating the 4.7-gigabyte format in November 1997 and in
November 1998 released the Format Book detailing the version 1.9
specification. Round robin testing was started in February this
year and moved forward for final confirmation. The decision by the
Steering Committee of the DVD Forum formally approving the
4.7-gigabyte physical format as the final format will accelerate
the introduction of the next generation of DVD-RAM products.
Outline of specifications
DVD-RAM V 2.0 DVD-RAM V 1.0DVD-ROM
Storage capacity 4.7GB/Side2.6GB/Side 4.7GB/Side
Laser wavelength 650nm 650nm 635nm,650nm
Numerical aperture of
lens 0.6 0.6 0.6
Recording method Phase change Phase change Embossed pits
Track format Wobble land groove Wobble land groove Series pits
Recording track pitch 0.615um 0.74um0.74um
Data bit length 0.28um 0.41um0.27um
Sector size 2048 bytes2048 bytes 2048 bytes
Modulation system 8 to 16 RLL 8 to 16 RLL 8 to 16 RLL
Error correction Reed-Solomon Reed-Solomon Reed-Solomon
Product Code Product Code Product Code
No. of zones 35 24 (CLV)
Fault managementYes Yes
Recording data rate 22.16M/bs11.08Mb/s
Contact:
DVD Forum
Office of Secretary, +81-3-5444-9580
|
