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Author Topic: first "Dual Layer" DVD-RW DL became available (Jan 2006)  (Read 184 times)

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Offline chrisNova777

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first "Dual Layer" DVD-RW DL became available (Jan 2006)
« on: October 29, 2020, 05:02:24 PM »
https://www.cdrinfo.com/d7/content/jvc-announces-availability-first-dual-layer-dvd-rw-discs


Quote
JVC Announces Availability of First Dual Layer DVD-RW Discs
 Optical Storage  Jan 11,2006  0
JVC today announced second quarter availability of the first single-sided, dual layer DVD-RW discs, in both standard and Mini DVD 2x speed versions. JVC is among the first to develop rewritable capability for these discs. The first two products to incorporate this technology are a 2x speed DVD-RW standard disc with a capacity of 8.5GB, for a recording time of up to 215 minutes, and a 2x speed 8cm Mini DVD for use in DVD camcorders. It has a capacity of 2.6GB, for up to 60 minutes of recording time.

Adding the rewritable feature to a single-sided, dual layer disc was made possible by JVC's development of a high-sensitive recording film, a new recording method that enhances erasability, and a proprietary precision thin film forming technology. JVC also developed a facing film bonding method that enables mass production of the new discs using conventional manufacturing equipment.

Features of JVC's Single-Sided, Dual Layer DVD-RW Disc Technology JVC's dual layer DVD-RW disc technology utilizes a semi-transparent first recording layer (L0 layer) with high transmission performance from the signal read side. With conventional DVD-RW disc technology, the use of a thinner recording layer in order to achieve improved transmission performance results in less laser beam absorption. The drop in laser absorption is insufficient to form and erase marks (recording signal patterns). JVC's new single-sided, dual layer DVD-RW disc technology makes use of a new high sensitive recording film that allow excellent transmission performance and signal rewritability, and a new recording method, "N-Strategy", which enhances erasability. The high sensitive recording film and "N-Strategy" are based on JVC's proprietary phase-change design technology developed for high speed DVD-RW discs. Furthermore, JVC employs precision thin film forming technology based on nanotechnology.

In addition, JVC developed a facing film bonding method in which the L1 and L0 recording layers are each formed on a separate substrate, but use a different forming order. The recording sides formed on each recording layer are then bonded in an opposed fashion, separated by a space layer. The two recording layers are manufactured as separate processes prior to bonding, resulting in improved production efficiency and mass production capability using conventional manufacturing equipment.

Despite the acceptable overall optical characteristics of the new media, JVC does not clarify whether they comply to the DVD standard. Considering that phase-change materials have a much higher absorption than the dyes in write-once discs, it would be the DVD-RW dual-layer media to be out of the DVD standard. For example, the reflectivity of such a dual layer disk could be an issue. In that case, a firmware upgrade in the existing DVD players/writers would be essential. Of course, small variations of the optical characterisitcs are within the tolearnce of hardware, so no compatibility issues with current DVD readers would occur.

Offline chrisNova777

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(July 2007)
« Reply #1 on: October 29, 2020, 05:37:51 PM »
https://www.cdrinfo.com/Sections/News/Print.aspx?NewsId=20863

Quote
July 3, 2007
JVC Unveils First DVD-RW DL Media

JVC today announced the release of the first single-sided, dual layer DVD-RW discs, scheduled to reach the market in August.

The new erasable media offer a capacity of 8.5GB and are build upon the "DVD-RW for DL Ver.2.0" standard, approved by the DVD Forum last month.

The phase-change discs can be recorded at 2x (22.16 Mbps), and can be recorded approximately 1,000 times, according to the Japanese company.

JVC's new dual layer DVD-RW disc technology makes use of a new high sensitive recording film that allow high transmission performance and signal rewritability, and a new recording method, "N-Strategy", which enhances erasability. The high sensitive recording film and "N-Strategy" are based on JVC's proprietary phase-change design technology developed for high speed DVD-RW discs.




In addition, JVC used the JVC Intelligent disc Producing System (JIPS DL) manufacturing method for the new discs. JIPS DL is an inverse stacking manufacturing technology. Both L1 and L0 recording layers are each formed on a separate substrate, but use a different forming order. The recording sides formed on each recording layer are then bonded in an opposed fashion, separated by a space layer. The two recording layers are manufactured as separate processes prior to bonding, resulting in improved production efficiency and mass production capability using conventional manufacturing equipment.

The discs also come with a special hard coating for protection against scratches, dust, and dirt that interfere with disc reading or writing.

JVC also plans to release 8cm DVD-RW DL media soon. The currently available 12cm DVD-RW DL discs are expected to be available for approximately 1,400 Yen ($11.5).

Offline chrisNova777

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JVC puts DVD-RW DL on hold (March 2008)
« Reply #2 on: October 29, 2020, 05:41:20 PM »
http://www.cdrlabs.com/forums/jvc-puts-dvd-media-hold-t24221.html
https://pc.watch.impress.co.jp/docs/2008/0310/victor.htm

Quote
Victor freezes DVD-RW DL media release plan

VD-W85A Announced on March 4 2008

 Victor Company of Japan, Ltd. announced on the 4th that it will freeze the release plan of the DVD-RW DL media "VD-W85A" with a capacity of 8.5GB. It was clarified in the document "Notice Regarding Freezing of DVD-RW for DL ​​Disc Commercialization" published on the company's website.

 VD-W85A is a rewritable media that complies with the DVD-RW for DL ​​Ver.2.0 standard and supports 8.5GB recording with two layers on one side. Initially scheduled to be released in August 2007, it has been postponed since then. It is expected that compatible drives will be released from January to February 2008, and it will be officially released at the same time.

 According to the announcement released by the company, the reason for the freeze is the recent market situation where the rapid growth of next-generation optical discs is expected, but this is partly because compatible drives have not been released yet and it is out of the forecast (the company). public relations).

 The current DVD-RW products will continue to be actively operated in the future.

□ JVC website
http://www.jvc-victor.co.jp/
□ News release
http://www.jvc-victor.co.jp/media/info_dvd-rw_dl.html
□ Product information
http://www .jvc-victor.co.jp/media/data/vd-w85a/
□ Related article
[July 3, 2007] JVC, DVD-RW DL media with a capacity of
8.5GB http://pc.watch.impress. co.jp/docs/2007/0703/victor.htm
[December 25, 2007] JVC postpones the release of DVD-RW DL media
http://pc.watch.impress.co.jp/docs/2007 / 1225 / victor.htm

( March 10, 2008 )

[Reported by matuyama@impress.co.jp ]