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BLU-RAY DISKBy: M.Viswanath
08N71A0432
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HISTORYHISTORY
1stGENERATION:
Compact disc (CD): --- 650/700MB
It is with us forover20 years.
Wavelengthoflaserwhichreadsdata: 780nm
Coloroflaser: Red
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2
nd
GENERATION:Digitalversatiledisc (DVD): --- 4.7GB
Itoffers high quality sound andvideothanCD.
Wavelengthoflaserwhichreadsdata: 650 nm
Coloroflaser: Red
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3rd GENERATION:
Blu-ray disc (BD): --- 25/50 GB-Next generationopticaldiscformat.
-Developed by blu-ray discassociation (which includes
Apple,Hitachi,HP, LG,Panasonic,Pioneer,Philips,Samsung, Sharp, Sony)
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-Wavelengthoflaserwhichreads data:
405 nm
-Coloroflaser: Blue-violetwhich was
developed bySHUJI NAKAMURA
at NICHIA CORPORATION
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FORMAT OF BD
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: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 TECHNOLOGYTHE TECHNOLOGYPits: spiral grooves that run
from the centre of the disc toits edges
Bumps: other sides of theseedges.Trackpitch: it is the distance
between the two tracks (of
pits) on the surface.--------------------------------Disc store digitally encoded data
in PITS.
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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
Laserneeded: blue-violet laser (405
nm)Data transferrate : 36 Mbps
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Courtesy Blu-ray Disc Founders Blu-ray Disc Format White Paper
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Numerical Aperture
measures the ability of a lens
to gather and focus light. As
the numerical aperture
increases, the focusing
power increases and the
beam size decreases
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Phase change implies
that the disc section is
either an amorphous or
crystalline state. Thereflectivity changes
accordingly thus
representing a binary bit
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COMP ARISON IN BUILDINGCOMP ARISON IN BUILDINGBD AND DVDBD AND DVD
BD
Data is placed on topof a 1.1 mm thick
polycarbonate layer
Doesnt suffer fromBIREFRINGENCE
Doesnt suffer fromDISC TILT
Hard coating is placedoutside to protectfrom scratches orfingerprints
DVD
Data is sandwichedb/w two
polycarbonate layers,each 0.6 mm thick
Suffer fromBIREFRINGENCE
Suffer from DISCTILT
No such hard coatingis laced
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This issue has introduced a competitor, the HD-
DVD, that based its technology around being
compatible with the DVD
Recently the BDA has developed recorders that are
BD/DVD/CD compatible
JVC has advanced the BD by developing a BD/DVD
combo disc that stores both DVD and BD data. It is
composed of two DVD layers and a third BD layer
storing 33.5 GB total
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BLU RAY S DURABILITY BLU RAY S DURABILITY
ADVANTAGEADVANTAGE
Various hard coating technologies make Bly rayVarious hard coating technologies make Bly ray
disc most durable and familydisc most durable and family --friendlyfriendly
HardHard--coating technology provides resistance to:coating technology provides resistance to:
-- Finger printsFinger prints
-- MarksMarks
-- ScratchesScratches
-- DustDust
Much more ROBUST than todaysMuch more ROBUST than todays
polycarbonatepolycarbonate--based CD/DVDs (and HD DVDs)based CD/DVDs (and HD DVDs)
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FEATURES OFBDFEATURES OFBDWith BD we can:Record HDTV without any quality
lossInstantly skip to any spot ondisc
Record one program while
watching other on the discCreate playlists
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Edit or reorder programs recordedon discAutomatically search for an empty
space on the disc to avoidrecording over a program
Access to web to downloadsubtitles and other extra features
And many more
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BLUBLU--RAYS DENSITYRAYS DENSITY
ADVANTAGEADVANTAGEHigher density enables better
data seek timesShorter to travel for same
amount of data results in faster
data seek
Better for random access ofdata
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THE NAMETHE NAME The blu-ray name is a
combination of blue, for thecolor of the laser that is usedand ray for optical ray.
The e in blue was
purposefully left off, according tothe manufacturers, because aneveryday word cannot be a
trademark.
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On GAURDOn GAURDBlu-ray discs are betterarmed than current DVDs.
They come equipped with asecure encryption system aunique ID that protects
against video piracy andcopyright infringement.
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Error rates increased in reading
and writing after the original BD
suffered scratches and fingerprints For protection, the prototype BD
was enclosed in a case
The case increased the size of thedisc drive
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DO MORE WITHBLUDO MORE WITHBLU
More capacity, Density andPerformance
More Industry Support/ConsumerReach (BDA has 140+ members)
More Durable
More Interactive User Experience
More Flexible Content Protection:AAC, BD+ Renewability Technologyand ROMMark
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Thank YouThank You