bluray disc
TRANSCRIPT
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BLU-RAY DISCBy : Junaid Hakeem
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HISTORY
1 st GENERATION:Compact disc (CD): --- 650/700 MBIt is with us for over 20 years.Wavelength of laser which reads data: 780 nmColor of laser: Red 2 nd GENERATION:Digital versatile disc (DVD): --- 4.7 GBIt offers high quality sound and video than CD.Wavelength of laser which reads data: 650 nmColor 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 about 13 hrs of standard video.
DOUBLE LAYER :- Can hold data up to 50 GB that
means 4.5 hrs of HD video or more than 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 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 micronsLaser needed : blue-violet
laser (405 nm)Data transfer rate : 36 Mbps
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COMPARISON IN BUILDING COMPARISON IN BUILDING BD AND DVDBD AND DVD
BD Data is placed on top of a
1.1 mm thick polycarbonate layer
Doesn’t suffer from BIREFRINGENCE
Doesn’t suffer from DISC TILT
Hard coating is placed outside to protect from scratches or fingerprints
DVD Data is sandwiched b/w
two polycarbonate layers, each 0.6 mm thick
Suffer from BIREFRINGENCE
Suffer from DISC TILT
No such hard coating is placed
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BLU RAY ‘S DURABILITY BLU RAY ‘S DURABILITY ADVANTAGEADVANTAGE
Various hard coating technologies make Bly ray Various hard coating technologies make Bly ray disc most durable and family -friendly”disc most durable and family -friendly”
Hard-coating technology provides resistance to:Hard-coating technology provides resistance to:
- Finger prints- Finger prints
- Marks- Marks
- Scratches- Scratches
- Dust- Dust Much more ROBUST than today’s Much more ROBUST than today’s
polycarbonate-based CD/DVD’s (and HD DVD’s)polycarbonate-based CD/DVD’s (and HD DVD’s)
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FEATURES OF BDFEATURES OF BDWith 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 other
extra features And many more…
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BLY-RAY’S DENSITY BLY-RAY’S DENSITY ADVANTAGEADVANTAGE
Higher density enables better data seek times
Shorter to travel for same amount of data results in faster data seek
Better for random access of data
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THE NAMETHE NAMEThe blu-ray name is a combination of
“blue”, 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, because an everyday word cannot be a trademark.
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On GAURDOn GAURD• Blu-ray discs are better armed than
current DVD’s. They come equipped with a secure encryption system– a unique ID that protects against video piracy and copyright infringement.
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DO MORE WITH BLU…DO MORE WITH BLU…More capacity, Density and
PerformanceMore Industry Support/Consumer
Reach (BDA has 140+ members)More DurableMore Interactive User ExperienceMore Flexible Content Protection:
AAC, BD+ Renewability Technology and ROM Mark
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Thank YouThank You