blue ray by dew

8/2/2019 blue ray by dew

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BLU-RAY DISCBy: DHRUV


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HISTORY

1st GENERATION:

Compact disc (CD): --- 650/700 MB

It is with us for over 20 years.Wavelength of laser which reads data: 780 nm

Color of laser: Red

2ndGENERATION:

Digital versatile disc (DVD): --- 4.7 GB

It offers high quality sound and video than CD.

Wavelength of laser which reads data: 650 nm

Color of laser: Red


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HISTORY

3rdGENERATION:

Blu-ray disc (BD): --- 25/50 GB

-Next generation optical disc format.

-Developed by blu-ray disc association (which includes Apple, Hitachi,HP, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony)

-Wavelength of laser which reads data: 405 nm-Color of laser: Blue-violet which was developed by

SHUJI NAKAMURAat NICHIA CORPORATION
http://en.wikipedia.org/wiki/Image:Blu-ray_200GB.png


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FORMAT OF BDIt comes in four different formats:

BD-ROM(read only) : for reading recordedcontent.

BD-R (recordable) : for PC data storage.BD-RW (rewritable) : for PC data storage.BD-RE (rewritable) : for HDTV (high definition

television) recording.


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TYPES OF BD: SINGLE LAYER :- Can hold data up to 25/27 GB that

means 2 hrs of HD video or about13 hrs of standard video.

DOUBLE LAYER :-

Can hold data up to 50 GB thatmeans 4.5 hrs of HD video or morethan 20 hrs of standard video.


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THE TECHNOLOGY

Pits: spiral grooves thatrun from the centre ofthe disc to its edges

Bumps: other sides ofthese edges.

Track pitch: it is thedistance between thetwo tracks (of pits) onthe surface.

--------------------------------Disc store digitallyencoded data in PITS.

--------------------------------


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THE TECHNOLOGY

So, in blu-ray disc:Pit size 0.15 microns (

more than twice assmall as the pits on

DVD )Track-pitch is: 0.32 microns

Laser needed: blue-violet

laser (405 nm)

Data transfer rate: 36 Mbps


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COMPARISON IN BUILDINGBD AND DVD

BD Data is placed on top of a

1.1 mm thickpolycarbonate layer

Doesnt suffer fromBIREFRINGENCE

Doesnt suffer from DISCTILT

Hard coating is placedoutside to protect fromscratches or fingerprints

DVD Data is sandwiched b/w

two polycarbonate layers,each 0.6 mm thick

Suffer fromBIREFRINGENCE

Suffer from DISC TILT

No such hard coating isplaced


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BLU RAY S DURABILITY

ADVANTAGE

Various hard coating technologies make Bly raydisc most durable and family -friendly

Hard-coating technology provides resistance to:

- Finger prints

- Marks

- Scratches

- Dust Much more ROBUST than todays

polycarbonate-based CD/DVDs (and HD DVDs)


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FEATURES OF BDWith BD we can: Record HDTV without any quality lossInstantly skip to any spot on disc Record one program while watching other on the

disc Create playlists Edit or reorder programs recorded on disc Automatically search for an empty space on the

disc to avoid recording over a program

Access to web to download subtitles and otherextra features

And many more


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BLY-RAYS DENSITYADVANTAGE

Higher densityenables better dataseek times

Shorter to travelfor same amountof data results infaster data seek

Better for randomaccess of data


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THE NAME

The blu-ray name is a combination ofblue, for the color of the laser thatis used and ray for optical ray.

The e in blue was purposefully leftoff, according to the manufacturers,because an everyday word cannot bea trademark.


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On GAURD

Blu-ray discs are better armed thancurrent DVDs. They come equippedwith a secure encryption system a

unique ID that protects against videopiracy and copyright infringement.


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DO MORE WITH BLU

More capacity, Density andPerformance

More Industry Support/Consumer

Reach (BDA has 140+ members)More Durable

More Interactive User Experience

More Flexible Content Protection:AAC, BD+ Renewability Technologyand ROM Mark


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Thank You

blue ray by dew

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