blue ray by dew
TRANSCRIPT
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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