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Blu Ray Dvd Format

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Blu-ray disk format was created for playing back andstoring of HD-video but it is also ideal for other applications as well likepersonal computer data storage, video game consoles and similar other consumerelectronic equipments. The wavelength of the blue laser is 405nm. Highdefinition DVD is capable of recording maximum of 15GB and the blu-ray canrecord 25GB data on one single layer disc. Sony carried out experiments withdifferent extreme values and tried the 400nm (shortest wavelength) andnumerical aperture's highest value. An optical lens's numerical aperture is thecapability of lens to focus the laser light at specific distance and point. Asthe numerical aperture goes higher, the distance becomes lesser. Optical disk?scapacity of recording data is dependent on the spot size of the laser beam.This spot size is proportional to the wavelength of the laser beam. Thereforethe capacity of holding data will be inversely proportional to objective lens?snumerical aperture (NA). Increase in NA and decrease of laser beam's wavelengthhelped to increase the data recording ability.

Sony decreased the wavelength of used in digitalversatile disks (650nm) to 405nm and also increased the NA to 0.85 from itsprevious 0.60 which helped to enhance the recording capacity 2.5 times more. Thatis how the Sony Blu-ray became capable of storing 25GB. High definition DVDhaving the same physical recording space can only store data of 15GB and DVDcan hold data of 4.7GB. DVD was 0.6mmdisk with protective coating of 0.6mm. Sony modified the structure of the diskand developed disk (1.1mm) with protective layer of 0.1mm.

The thickness of internallayers of HD-DVD and the blu-ray disk is different but their thickness is sameof 1.2mm. So this makes the blu-ray format more capable of recording hugeamount of data and of course more data than the High definition DVDs. Inblu-ray disk the material for reading is thinner because the layer of data is nearerto the disk surface when compared to data layer of HD-DVD & DVD. Thinnerprotective layer enables reduced pitch of tracks among the smaller pits, highernumerical aperture's value and increased data density. Blu-raydisk required initially a bulky cartridge for the protection of disk as thedata layer was very near to surface of the blu-ray disc. That is how theSony Blu-ray became capable of storing 25GB.

TDK is also a member of BDassociation. TDK afterwards introduced ?DURABIX? which was useful andadvantageous coating technology that enhanced blu-ray media's resilience and soDURABIX abolished the requirement of cartridges for recording layer?sprotection. The variation in the structure of the blu-ray disk makes itdifferent from DVD and the HD-DVDs. Sony offers solution whose speed andrecording capacity both are higher than the other technologies of disk format.

Blu-ray disk content isprotected by the same technology used in the HD-DVD format. This technology forcontent protection was introduced by technology group Advanced Access ContentSystem (AACS) licensing administration. The founders of this technology groupwere Intel Corporation, Panasonic, Toshiba, IBM, Warner Bros. Studios, WaltDisney, Sony and Microsoft. The AACS technology group is specification for themanagement of stored content on optical disk format's next generation likeblu-ray and High Definition DVD.

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