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World's first 16 Layer Optical Disc stores 400GB

Jul 7 2008, 4:17am CDT | by , in News | Other Stuff

World's first 16 Layer Optical Disc stores 400GB
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Pioneer Corporation unveiled a 16-layer read-only optical disc with a capacity of 400GB for the first time in the world.

The new disc has a per-layer capacity of 25GB, which is the same as that of a Blu-ray Disc (BD).
This multilayer technology will also be applicable to multilayer recordable discs.
For multilayer optical discs, it has been difficult to obtain clear signals from each recording layer in a stable manner due to crosstalk from adjacent layers and transmission loss. Utilizing the optical disc production technology that it has developed in the DVD field, Pioneer solved these problems by, among other things, using a disc structure that can reduce crosstalk from adjacent layers, resulting in a 16-layer optical disc that can playback high-quality signals from every layer.

As for the read-out system, Pioneer achieved stability in the playback of recorded signals by employing a wide-range spherical aberration compensator and light-receiving element that can read out weak signals at a high signal-to-noise ratio in the optical pick-up mechanism. Since the optical specifications of the objective lens, such as NA (Numerical Aperture), are the same as those for the existing BD discs, it is possible to maintain compatibility between the new 16-layer optical disc and the BD discs.

Pioneer will present the details of this research at the International Symposium on Optical Memory and Optical Data Storage 2008 (ISOM/ODS2008) to be held in Hawaii from July 13th.
Via the Pioneer site.


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