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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