Blu-ray Disc

PRESENTED BY: G. SHIVA PRASAD 07N71A0573

CONTENTS1. Introduction2. Data storage techniques3. Comparision of storage

technologies4. Characteristics of Blu-ray disc5. Principal BD Specifications 6. Applications7. Conclusion

INTRODUCTIONBlu-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.

(Contd…)The companies that have jointly established the BD

specifications are:Hitachi, LtdLG Electronics Matsushitha Electrical Industrial Co. LtdMitsubishi Electric CorporarionPioneer CorporationSamsung Electronics Co. LtdSony ThomsonRoyal Phillips ElectronicsSharp 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 .

CONTD…..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 SpanBlu-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 developedIncorporation of Robust copy mechanismDRM (Digital Right Management)is the

copyright protection scheme the media industry uses to prevent piracy.

CostLong term Profitability model for content ProvidersCheapest Production cost

CapacityA 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 DiscHard 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.

CompatibleThe BD drives are designed to be backwardcompatible, i.e. CDs and DVDs work equally well with the BD drives.

Principal BD Specifications

Capacity 23.3 25 27GB(single 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

Recording method Phase change

Data track Groove recording

Visual data MPEG-2 video

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 780 nm 650 nm 405 nm Numerical aperture 0.45 0.60 0.85 Minimum pit length 0.83 um 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)

1 7 GB (2L/2S)

Blu-ray Disc Applications High definition television recording

High definition video distribution

Mass data storage

ConclusionBlu ray is expected to replace VCRs and DVD

recorders over the coming years, with the transition to HDTV.

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