DVD-Audiobahn New DVD-Audio music releases and talk about the latest players.

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Good Link, does it show DualDisk is an illegal format?

Posted by Norman Tracy (M) on November 5, 2004 at 07:18:10

In Reply to: Posted more information... posted by Steven R. Rochlin on November 5, 2004 at 06:04:46:

Checking back with the standards keeper is always a good idea. On the www.dvdforum.org web site I searched for ‘DualDisk’, ‘Dual Disk’, and ‘Dual-Disk’ and got zero hits. Are they calling it something else? At:
http://www.dvdforum.org/tech-dvdprimer.htm#7
under the DVD Formats heading the DVD gatekeepers list:

DVD Video
For viewing movies and other visual entertainment. The total capacity is 17 Gbytes if two layers on both sides of the disk are utilized.
DVD-ROM
Its basic technology is the same as DVD Video, but it also includes computer-friendly file formats. It is used to store data. This product should supplant conventional CD-ROMs in the near future.
DVD-R
Its capacity is 4.7 Gbytes. Originally designed for professional authoring, a version for general consumer use is now under development. As with CD-R, users can write only once to this disk.
DVD-RAM
This makes DVD a virtual hard disk, with a random read-write access. Originally a 2.6-Gbyte drive, its capacity has increased to 4.7-Gbyte-per-side. It can be re-written more than 100,000 times.
DVD-RW
Similar to DVD-RAM except that its technology features a sequential read-write access more like a phonograph than a hard disk. Its read-write capacity is 4.7 Gbytes per side. It can be re-written up to about 1,000 times.
DVD Audio
The latest audio format more than doubles the fidelity of a standard CD. It is expected to become the most popular audio disk.

DualDisk seems to be MIA.

Off the www.dvdforum.org web site one is linked to http://www.dvdfllc.co.jp/. The DVD Forum is the industry group which devised the original DVD specification and recommends extensions. DVD FLLC (Format Logo Licensing Corp) is the company which sells and administers licenses to build DVD players/drives or press DVD disks. Again I found no mention of DualDisk. The interesting thing I found there was this statement:
“0.6mm Thick Optical Discs

Lately, non-bonded discs with the thickness of 0.6mm are being manufactured and distributed to the public. These so called DVD discs are clearly out of Specifications and often cannot be properly played on players and drives in the market. They are reported to cause damages to the discs themselves and/or the hardware during reproduction. Licensees are reminded that the use of the DVD Format for products that do not conform to the Specifications is a violation of the DVD Format/Logo License. Such violation may lead to termination of the License.”

Guess it’s not just Sony who have some concerns with too-thick disks!

happy listening

Norman Tracy

• DVD FLLC (Format Logo Licensing Corp)   (Open in New Window)

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