INTRODUCTION<br />Blu-ray, also known as Blu-ray Disc (BD), <br />Developed by the Blu-ray Disc Association (BDA) and (including Apple, Dell, Hitachi, HP, JVC, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony etc.).<br />The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. <br />This extra capacity combined with the use of advanced video and audio codecs will offer consumers an unprecedented HD experience. <br />
Disc Characteristics <br />Single layer: 25 GB Dual layer: 50 GB <br />Diameter: 120 mm <br />Thickness: 1.2 mm <br />Center hole diameter: 15 mm <br />Uses laser of wavelength 405 nm <br />The smaller laser, compared to the DVD and CD, keeps the process more efficient (~5 mW) <br />
Working-Lasers & Optics<br />The new format uses a blue-violet laser instead, hence the name Blu-ray. <br />The benefit of using a blue-violet laser (405nm) is that it has a shorter wavelength than a red laser (650nm), which makes it possible to focus the laser spot with even greater precision.<br />This allows data to be packed more tightly and stored in less space, so it's possible to fit more data on the disc even though it's the same size as a CD/DVD. This together with the change of numerical aperture to 0.85 is what enables Blu-ray Discs to hold 25GB/50GB. <br />
Hard-coating technology<br />Because the Blu-ray Disc data layer is closer to the surface of the disc, compared to the DVD standard, it was at first more vulnerable to scratches.<br />TDK was the first company to develop a working scratch protection coating for Blu-ray Discs. It was named DURABIS.<br />Verbatim's recordable and rewritable Blu-ray Disc use their own hard-coat technology called ScratchGuard.<br />
ADVANTAGE OF BLU RAY DISC<br />Record high-definition television (HDTV) without any quality loss<br />instantly skip to any spot on the disc<br />record one program while watching another on the disc <br />edit programs recorded on the disc <br />automatically search for an empty space on the disc<br />A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data -- that's more than two hours of high-definition video or about 13 hours of standard video<br />A double-layer Blu-ray disc can store up to 50 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video.<br />
FUTURE OF BLU RAY DISC<br />Blu-ray is currently supported by more than 180 of the world's leading consumer electronics, personal computer, recording media, video game and music companies.<br />Seven of the eight major movie studios (Disney, Fox, Warner, Paramount, Sony, Lionsgate and MGM) have released movies in the Blu-ray format and others will join soon ………..<br />Look for BD with more than two layers as the technology is further refined .<br />`<br />
THANK YOUPresented by:- SAURAV KUMAR ROLL NO. 73<br />
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