blu-ray disc

[seminar class]

presented by:
G. SHIVA PRASAD

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Blu-ray Disc
INTRODUCTION
 Blu-ray (BD) is a next-generation optical disc format.
 The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
 The name Blu-ray was derived from technology which utilizes a blue –violet laser to read and write data on Blu-ray disc.
 Character ‘e’ was intentionally left out so that term Blu-ray could be used as trademark.
The companies that have jointly established the BD specifications are:
 Hitachi, Ltd
 LG Electronics
 Matsushitha Electrical Industrial Co. Ltd
 Mitsubishi Electric Corporarion
 Pioneer Corporation
 Samsung Electronics Co. Ltd
 Sony
 Thomson
 Royal Phillips Electronics
 Sharp Corporation
DATA STORAGE TECHNIQUE:
 A blue-violet laser of wavelength (450 nm) is employed on Blu-ray disc.
 By employing such short wavelength Blu-ray disc successfully minimizes beam spot size INCREASING lens’s NA 0.85 .
 As a consequence of NA and wavelength tracking pitch of Blu-ray reduce to 0.32um which is less than half of DVD. This helps data to pack more tightly on Blu-ray disc than DVD.
 A single-layer disc can hold 25GB, which can be used to record over 2 hours of HDTV .
 There are also dual-layer versions of the discs that can hold 50GB.
Comparision of storage technologies
CHARACTERISTICS OF BLU-RAY
 Life Span
 Content Protection
 Cost
 Capacity
 Robustness of disc
 Compatible
Life Span
 Blu-ray disc have larger life span than any ordinary disc any where between 10 to (unlikely) 250 year.
 It is because of recordable material used in Blu-ray disc i.e combination of Si and Cu.
 Blu ray recordable media is a combination of a layer of silicon and copper which is bonded together during the burning process, this alloy is much more resilient to the hazardous conditions .
Content Protection
 Strongest content and copy protection schemes ever developed
 Incorporation of Robust copy mechanism
 DRM (Digital Right Management)is the copyright protection scheme the media industry uses to prevent piracy.
Cost
 Long term Profitability model for content Providers
 Cheapest Production cost
Capacity
 A single-layer disc can hold up to 25 gigabytes of information, while a dual-layer disc can hold up to 50 gigabytes of information.
 Future versions of Blu-ray discs may hold up to 200 gigabytes of Information.
 It is enough to put 2.5 hours of HDTV recording on it. It also can record over 13 hours of standard TV broadcasting.
Robustness of Disc
 Hard coating on Blu ray offer 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
Blu-ray Disc Applications
 High definition television recording
 High definition video distribution
 Mass data storage
High definition television recording
 The Blu-ray disc format offers consumers the ability to record their High Definition television broadcasts in their original quality for the first time, preserving the pure picture and audio level as offered by the broadcaster.
 Next level in home entertainment, offering an unsurpassed user experience Since Blu-ray Disc format incorporates the strongest copy protection algorithms of any format or proposal to date, the format allows for recording of digital broadcasts while meeting the content protection demands of the broadcast industry.