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BLU-RAY DISCBY:G.OM PRAKASH REDDY

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HISTORY

1stGENERATION:

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 GBIt 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:

-Color of laser:

http://en.wikipedia.org/wiki/Image:Blu-ray_200GB.png

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It 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 definitiontelevision) recording.

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TYPES OF BD:

:

- Can hold data up to 25/27 GB that means

2 hrs of HD video or about 13 hrs ofstandard video.

:

- Can hold data up to 50 GB that means 4.5hrs of HD video or more than 20 hrs ofstandard 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 the

distance between the twotracks (of pits) on thesurface.

--------------------------------Disc store digitally encoded

data in PITS.

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

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THE TECHNOLOGY

So, in blu-ray disc:

Pit size 0.15 microns (more than twice as small

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 DVDBD

Data is placed on top of a 1.1mm thick polycarbonate layer

Doesnt suffer fromBIREFRINGENCE

Doesnt suffer from DISCTILT

Hard coating is placed outsideto protect from scratches orfingerprints

DVD Data is sandwiched b/w two

polycarbonate layers, each 0.6mm thick

Suffer from BIREFRINGENCE

Suffer from DISC TILT

No such hard coating is placed

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BLU RAY S DURABILITY

ADVANTAGE

Various hard coating technologies make Blu- 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 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 discCreate playlistsEdit or reorder programs recorded on discAutomatically search for an empty space on the disc to

avoid recording over a program

Access to web to download subtitles and other extrafeatures

And many more

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BLY-RAYS DENSITY

ADVANTAGE

Higher densityenables better dataseek times

Shorter to travel forsame amount of dataresults in faster data

seekBetter for random

access of data

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THE NAME

The blu-ray name is a combination ofblue, for the color of the laser that is

used and ray for optical ray.

The e in blue was purposefully left off,

according to the manufacturers, becausean everyday word cannot be a trademark.

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On GAURD

Blu-ray discs are better armed thancurrent DVDs. They come equipped with a

secure encryption system a unique IDthat protects against video piracy andcopyright infringement.

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DO MORE WITH BLU

More capacity, Density and Performance

More Industry Support/Consumer Reach

(BDA has 140+ members)More Durable

More Interactive User Experience

More Flexible Content Protection: AAC,BD+ Renewability Technology and ROMMark

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Thank You

optical disc format.

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