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BLU-RAY DISC By : VIKAS H SHARMA 

(RG6003A25) 

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HISTORY  

1 st 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  

 2 nd GENERATION:

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  

 3 rd  GENERATION :

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 NAKAMURA

at NICHIA CORPORATION 

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FORMAT OF BD

It comes in four different formats:

BD-ROM (read only) : for reading recorded

content.

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 that run from the centre of the disc to its edges 

Bumps : other sides of these edges.

Track pitch : it is the distance between the two tracks (of pits) on the 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 BUILDING BD AND DVD 

BD Data is placed on top of a

1.1 mm thickpolycarbonate layer

Doesn’t suffer fromBIREFRINGENCE 

Doesn’t suffer from DISC TILT 

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 today’s

polycarbonate-based CD/DVD’s (and HD DVD’s) 

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FEATURES OF BD With BD we can: Record HDTV without any quality loss Instantly 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- RAY’S DENSITY  

 ADVANTAGE 

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 of  “blue”, 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 DVD’s. 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