bluray disc


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1 B.Chitti babu 07X11A1211

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CONTENTS Introduction Characteristics of Blu-ray disc Specification of Blu-ray disc Comparision of storage technologies Applications Conclusion 2

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1 st GENERATION : Compact Disc (CD): -- 650/700MB It is with us for over 20 yrs. Wavelength of laser which reads data: 780nm Color of laser: Red 2nd GENERATION : Digital V ersatile Disc (DVD): -- 4.7GB It offers high quality sound and video than CD. Wavelength of laser which reads data: 650nm Color of laser: Red INTRODUCTION 3

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3 RD GENERATION: Blu-ray disc (BD): -- 25/50 GB Next generation optical disc format. Wavelength of laser that reads data: 405nm Color of laser: Blue-violet which was developed by SHUJI NAKAMURA at NICHIA COPERATION. The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. The “ e ” was intentionally left out of the name due to trademark restrictions INTRODUCTION 4

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CHARACTERISTICS OF BLU-RAY Life Span Cost Capacity Robustness of disc Compatible 5

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6 Life Span In the case of ordinary discs, the disc life is less . In the rewritable versions, as re-writing is done repeatedly to one area of the disc most probably, the inner perimeter limiting the disc life. BDFS (Blu-ray Disc File Structure is designed so as to avoid this problem, by using a system that uses free disc spaces with equal frequency Cost Long term Profitability model for content Providers Cheapest Production cost

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7 Capacity The Blu-ray disc enables the recording, rewriting and playback of HD video up to 27 GB of data on a single sided single layer. It is enough to put 2.5 hours of HDTV recording on it. It also can record over 13 hours of standard TV broadcasting .

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8 Robustness of Disc Stronger resistance to scratches and fingerprints The protective layer is hard enough to prevent accidental abrasions and allows fingerprints to be removed by wiping the disc with a tissue. Compatible The BD drives are designed to be backward compatible , i.e. CDs and DVDs work equally well with the BD drives.

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10 BD SPECIFICATIONS Capacity 23.3,25,27GB ; 50 ,54 GB ; (single layer) (Double layer) Wave length of the laser 405nm Numerical Aperture of the objective lens 0.85 Data transfer rate 36Mbps Thickness of the disc 1.2mm Diameter of the center hole 15mm Data track Groove recording Visual data MPEG-2 video

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11 Comparison of CD,DVD and B D specification Parameter CD DVD BD . Disk diameter 120 mm 120 mm 120 mm Disk thickness 1.2 mm 1.2 mm 1.2 mm Laser wavelength 780nm 650 nm 405 nm Numerical aperture 0.45 0.60 0.85 Minimum pit length 0.83um 0.4 um 0.138 um Data rate 1.2 Mb/sec 11 Mb/sec 36 Mb/sec Number of sides one ----- one or two Number of data layers One ----- One or two Data capacity ~680 MB 4.7 GB (1L) 27 GB 8.5 GB (2L) 54 GB

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14 Blu-ray disc and CD’s /DVD’s 1 DVD = 5 to 10 CD’s 1 Blu-ray = 5 to 10 DVD’s !!!!!! Usage of a blue instead of a red laser Improved lens specifications Backward compatibility ( Comparison Between Blu-ray n others)

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15 Blu-ray Disc APPLICATIONS High definition television recording High definition video distribution High definition camcorder archiving Mass data storage

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17 CONCLUSION The blu-ray discs offers more storage capability up to 54 GB,enough to hold about 4.5 hours of high –definition video or more than 20 hours of standard video. It is very likely that the technology will be adopted as the next generation optical disc format for pc storage and replace technologies such as DVD+-R ,DVD+-RW and DVD-RAM

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18 Queries..?

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