Pioneer has unvailed 400GB blue-ray disk
Pioneer corporation in Japan has developed world's first 16 layer read-only optical disk.It has a massive cppacity of 400GB.Its each layer contain 25GB.Pioneer said that it is equivalent to blue- ray disk.This multi-layer technology is applicable to all multi-layer recordable disks
In the case of multi-layer opticaldisks it is difficult to obtain clear signals from each recording layer in a stable manner due to crosstalk from adjacent layers and transmission . Pioneer solved these problems by 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.
For the read-out system, Pioneer achieved stability in the playback of recorded signals by employing a wide-range of 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.
The 16-layer optical disc technology, capable of storing much more data than the conventional discs on one disc.This will reduce the no of disks.Pioneer claims that this has also the capacity to store data for a very large period than any other disk at present
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