1. BLU-RAY DISC
By : raman sanoria

2. Blu_Ray Disks
INDEX
• Introduction
• History & Evolution
• Features
• Working
• Implementation
• Future & Commercial Market
• Conclusion
• References
ISE, SCE
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3. INTRODUCTION
 Blu­ray disc (BD) is appropriately named after the blue laser used to
write the data
 A Blu-ray Disc (also known as BD or Blu-Ray) is an
optical disc storage medium designed to supersede the
standard DVD format.
 The disc has the same physical dimensions as standard
DVDs and CDs
 Takes up about five times more bandwidth and therefore
requires a disc with about five times more storage.
 Blu-ray is the next-generation digital video disc. It can
record, store and play back high-definition video and digital
audio, as well as computer data. The advantage to Blu-ray
is the sheer amount of information it can hold.
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4. INTRODUCTION(contd)
 A single-layer Blu-ray disc, which is roughly the
same size as a DVD, can hold up to 25GB of data --
that's more than two hours of high-definition video or
about 13 hours of standard video.
 A double-layer Blu-ray disc can store up to 50 GB,
enough to hold about 4.5 hours of high-definition
video or more than 20 hours of standard video.
 Users will be able to connect to the Internet and
instantly download subtitles and other interactive
movie features.
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5. 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

6. 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 reads data: 405 nm
-Color of laser: Blue-violet which was developed by
SHUJI NAKAMURA
at NICHIA CORPORATION

7. FEATURES
•Record high-definition television (HDTV) without any quality
loss
•Instantly skip to any spot on the disk
•Record one program while watching another on the disc
•Create playlists
•Edit or reorder programs recorded on the disc
•Automatically search for an empty space on the disc to avoid
recording over a program
•Access the Web to download subtitles and other extra features
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8. Working
•Discs store digitally encoded video and audio information in pits -- spiral grooves
that run from the center of the disc to its edges.
• A laser reads the other side of these pits -- the bumps -- to play the movie or
program that is stored on the DVD.
•The more data that is contained on a disc, the smaller and more closely packed the
pits must be.
• The smaller the pits , the more precise the reading laser must be.
•Unlike current DVDs, Blu-ray uses a blue laser . A blue laser has a shorter
wavelength (405 nanometers) than a red laser (650 nanometers).
•The smaller beam focuses more precisely, enabling it to read information recorded
in pits that are only 0.15 microns (µm) this is more than twice as small as the pits
on a DVD.
•Blu-ray has reduced the track pitch from 0.74 microns to 0.32 microns. The
smaller pits, smaller beam and shorter track pitch together enable a single-layer
Blu-ray disc to hold more than 25 GB of information
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9. 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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10. 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.

11. 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.

12. 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.
--------------------------------

13. 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 microns
Laser needed : blue-violet
laser (405 nm)
Data transfer rate : 36 Mbps

17. COMPARISON IN BUILDING
BD AND DVD
BD DVD
 Data is placed on top of a  Data is sandwiched b/w
1.1 mm thick two polycarbonate layers,
polycarbonate layer each 0.6 mm thick
 Doesn’t suffer from  Suffer from
BIREFRINGENCE BIREFRINGENCE
 Doesn’t suffer from DISC  Suffer from DISC TILT
TILT
 Hard coating is placed  No such hard coating is
outside to protect from placed
scratches or fingerprints

18. BLU RAY ‘S DURABILITY
ADVANTAGE
 Various hard coating technologies make Bly ray
disc 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)

19. 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 other
extra features
 And many more…

20. BLY-RAY’S DENSITY
ADVANTAGE
 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

21. THE NAME
The 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.

22. On 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.

26. DO MORE WITH BLU…
 More capacity, Density and
Performance
 More Industry Support/Consumer
Reach (BDA has 140+ members)
 More Durable
 More Interactive User Experience
 More Flexible Content Protection:
AAC, BD+ Renewability Technology
and ROM Mark

27. Thank You