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The New Storage Technique to Increases the Capacity of CD and DVD Media
- The Scientists of Japan, proposed a new method by using arrays of multidirectional V-shape pits for storing more data on optical discs.
- Japanese Scientists said that structure of this single layer geometry is compatible to current mass-production of optical storage discs by stamping.
- This technology may help realizing a variety of high density memory applications too. However, it cannot be applied on Blu-ray discs and of course, the V-pit CD/DVD discs are not compatible with CD/DVD ROM drives currently.
- At the present time, high-density optical recording systems in combination with a high numerical aperture (NA) optics and a blue laser diode have increased the capacity of optical disks to a 20 Gbits level in the Blu-ray system.
- Be further increase for the data storage capacity, technologies such as a polarization multiplex recording system, a holographic data storage, a multilayer optical disk have now been developed.
- But these technologies have not the simplicity enabling mass-production by simple stamper processing applied in the production of current CD and DVD media.
- Other methods proposed for the increase of the capacity of discs, including multi-bits configurations of depth controlled single pits. Although these methods enabled stamper reproduction, since the principle is based on the optical multiplexing involving the reflection phase modulation by the pit geometry, they require high precision in the pit shape reproduction.
- Come from the University of Tohoku in Japan, Toshihide Tsuru and Masaki Yamamoto proposed a new concept of high-density recording by imprinting an array of V-shape pits composed of mirror facets of specified directions and slopes on a media surface.
- According to the scientists, the method can increase the capacity of CD and DVD media by nine times.
- Reading the stored data on the CD or DVD media (1 and 0) requires the read out of the direction of the facet. This has been achieved by determining the parameters of the reflected light, which appears as elliptically polarized. The Japanese Scientists claim that they have successfully read out the stored data with very high accuracy.