Blu-ray disc is the third generation optical disc format that can store 25-50GB of data, almost 6 times as much as DVDs. It uses a blue-violet laser with a wavelength of 405nm to read incredibly small pits only 0.15 microns in size. Developed by the Blu-ray Disc Association, Blu-ray discs offer high definition video playback, interactive menus, multiple layers for extended storage, and secure encryption to prevent piracy.

1. BLU-RAY DISC
By : Naveen Sihag

2. 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

3. 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

4. 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.

5. 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.

6. 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.
--------------------------------

7. 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

11. 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

12. 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)

13. 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…

14. 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

15. 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.

16. 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.

20. 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

21. Thank You