Blu-ray, also referred to as Blu-ray Disc (BD), is the name associated with a next generation optical disc format
The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
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Contents
• Introduction
• History
• The Name
• Format of Blu-ray disc
• Structure
• Types of Blu-ray Disc
• Comparison between BD/DVD/CD
• Characteristics
• Specification
• On Guard
• Application
• Future
• Conclusion
• Bibliography
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Introduction
• Blu-ray, also referred to as Blu-ray Disc
(BD), is the name associated with a next
generation optical disc format
• The format was developed to enable
recording, rewriting and playback of high-
definition video (HD), as well as storing
large amounts of data.
• Although present optical disc
technologies such as DVD make use of a
red laser to read and write data, the Blu-
ray format uses a blue-violet laser in its
place.
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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
2nd
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
3rd
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 read data:405 nm
-Color of laser: Blue-violet which was
developed by SHUJI NAKAMURA
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First Thing’s First –
Why The Name?
• The blu-ray name is the combination of
“blue”, for color of the laser that is
used and “ray” for the 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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Format of Blu-ray
disc
It comes in four different formats:It comes in four different formats:
1.1. BD-ROM (read only): for readingBD-ROM (read only): for reading
recorded content.recorded content.
2.2. BD-R (recordable): for PC dataBD-R (recordable): for PC data
storage.storage.
3.3. BD-RW (rewritable): for PC dataBD-RW (rewritable): for PC data
storage.storage.
4.4. BD-RE (rewritable): for HDTV (highBD-RE (rewritable): for HDTV (high
definition television) recording.definition television) recording.
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Structure
• Disc store digitally encoded data in
PITS.
• Pits: spiral groves that runs from the
center of the disc to its edge.
• Track pitch: it is the distance between
the two tracks (of pits) on the surface.
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Types of Blu-ray Disc
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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Characteristics
- Lifespan
- Blu-ray Disc format is designed to stay
relevant for at least 10 to 15 years.
- Cost
- Blu-ray Disc production costs are within 10%
of DVD production costs, although a Blu-ray
Disc offers 5-10 x the capacity.
- Capacity
- The Blu-ray Disc format offers the highest
capacity of any consumer media format to
date.
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Characteristics
- Robustness of Disc
- The discs offer much stronger resistance to
scratches and fingerprints than other existing
and proposed formats.
- Compatible
- The BD drives are designed to be backward
compatible, i.e. CDs and DVDs work equally
well with the BD drives.
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Specification
Capacity 23.3 25 27GB
(single layer)
Wave length of the laser 405nm
Numerical Aperture of the
objective lens
0.85
Data transfer rate 36Mbps
Thickness of the disc 1.2mm
Diameter of the center hole 15mm
Recording method Phase change
Data track Groove recording
Visual data MPEG-2 video
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On Guard
• Blu-ray discs are better armed than
current DVD’s. They come equipped
with a secure encryption system – a
unique ID that protected against video
piracy and copyright infringement.
• Disc is mandatory and will be
governed by strict licensing
procedures.
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Application
- High Definition Television
Recording
- High Definition broadcasting is vastly
expanding in the U.S. and Asia.
- High Definition Video Distribution
- Due to its enormous data capacity of 25 to 50
GB per (single-sided) disc, the Blu-ray Disc
format can store High Definition video in the
highest possible quality.
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Application
- Mass Data Storage
- The Blu-ray Disc format again offers 5-
10 x as much capacity as traditional
DVD resulting in 25 to 50 GB of data to
be stored on a single rewritable or
recordable disc.
- Digital Asset Management and
Professional Storage
- Due to its high capacity, low cost per GB and
extremely versatile ways of transferring data
from one device to another