DVD Forum releases specifications for DVD-Recordable. This is good for CUBE's encoder biz................
DVD Forum Announces DVD-R Version 1.0
Business Wire - September 25, 1997 23:08
TOKYO--(BUSINESS WIRE)--Sept. 26, 1997--The DVD Forum today further
reinforced the fast-growing line-up of DVD products with the
announcement of specifications for a write-once disc offering
compatibility with DVD-Video and ROM formats, as well as the
technological expandability required to meet next-generation needs.
The newly-announced DVD-R offers a 3.95 gigabyte single-sided storage
capacity and a simplified read-write optical system. Version 1.0
specifications of the disk will be made available to all interested
parties in a DV-R Format Book.
This first-generation DVD-R will provide enhanced support for the
development of DVD titles. As a key authoring tool for the professional
market it will allow developers to produce and verify DVD software
titles and assure their compatibility with the DVD-ROM and DVD-Video
standards.
The DVD-R Working Group is following up the agreement by starting
discussions this month on the format for a next-generation 4.7GB DVD-R.
This larger capacity disc is expected to offer even greater versatility,
including application in the home-use market. The DVD Forum will support
this wider use by simultaneously studying a copyright protection system
for DVD-R. [It sounds like they may have to modify the copy-protection scheme to do this.]
Since the April announcement of version 0.9 of the DVD-R format, the
working group has evaluated DVD-R disc compatibility, with the support
of the DVD-R Advisory Group of more than 20 hardware and storage media
manufacturers from around the world. This has confirmed DVD-R's
compatibility with read-only DVD disc formats, as well as its
reliability and expandability. The announcement of version 1.0 format
confirms these findings.
The finalized format seeks to satisfy user requirements to the fullest
extent possible; to ensure expandability to the next-generation 4.7GB
disc, and facilitate the earliest possible development of that disc; and
to support a disc offering superior expandability, reliability and full
compatibility with the DVD-Video and ROM formats.
The main features of the format version 1.0 are:
(1) A recordable optical disc with a single-sided capacity of 3.95GB,
six times the capacity of a CD-R, and a double-sided capacity of 7.9GB.
(2) A simple configuration of optical systems and simplified overall
structure. The mechanism does not require a magnetic recording head.
(3) As DVD-R has the same physical specifications and format as a
read-only DVD, it can be played back on DVD-Video players and DVD-ROM
drives already on the market.
Outline of DVD-R Specifications
Storage capacity: 3.95GB (single sided)/7.9GB
(double sided) .. 120mm
1.23GB (single sided)/2.46GB
(double sided) .. 80mm
Disc diameter: 120mm/80mm
Disc thickness: 1.2mm (0.6mm x 2; bonded structure)
Recording method: Laser power modulation
Laser wavelength: 635nm (recording), 635/650nm (playback)
Numerical aperture
of lens: 0.6
Data bit length: 0.293 micron
Track pitch: 0.80micron
Track format: Wobble land pre-pit, groove recording method
Modulation system: 8/16
Error correction system: Reed-Solomon Product Code
The DVD Forum consists of: Hitachi, Ltd., Matsushita Electric Industries
Co., Ltd., Mitsubishi Electric Corp., Victor Company of Japan, Pioneer
Electric Corp., Sony Corp., Toshiba Corp., Philips Electronics N.V.,
THOMSON Multimedia, and Time Warner, Inc.
CONTACT: DVD Forum, 81-3-5444-9580
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