Blu-ray is a next-generation optical disc format that can store more data than DVDs. It uses a blue-violet laser with a shorter wavelength to achieve a smaller and more closely spaced pit size, allowing for 25GB on a single-layer disc versus DVD's 4.7GB. Blu-ray's smaller pit size and track pitch provide higher density and durability than DVDs. While critics argue it requires new machinery, Blu-ray is seen as the future standard format for high-definition video, eventually replacing DVDs.

1. BLU RAY
DISK
THE FUTURE OF DVD…

2. PRAVESH D. PATEL
(CLICK ON “DISC” TO CONTINUE)

3. Table of Content
HISTORY
THE NAME
WHAT IS BLU RAY
FORMAT OF BD
TYPE OF BD
THE TECHNOLOGY
COMPARISON IN BUILDING BD
AND DVD
COMPARISON IN BEAM SIZE

4. FEATURES OF BD
BLU-RAY’S DURABILITY
ADVANTAGE
BLU-RAY DENSITY ADVANTAGE
CRITISISM
OPINION AND FUTURE OF BR
TABLE OF CONTENT

5. HISTORY
• 1st `GENERATION :
• Compact Disc (CD):-- 650/700MB
• It is with us for over 20 yrs.
• Wavelength of laser which reads data: 780nm
• Color of laser: Red
• 2nd GENERATION :
• Digital versatile disc (DVD):-- 4.7GB
• It offers high quality sound and video than CD.
• Wavelength of laser which reads data: 650nm
• Color of laser: Red
•

6. HISTORY
3RD Generation:
• Blu-ray disc (BD):-- 25/50 GB
• Next generation optional disc format.
• Developed by blu-ray association (which includes
Apple, Hitachi, HP, LG, Panasonic, Pioneer,
Philips, Samsung, Sharp, Sony).
• Wavelength of laser that reads data: 405nm
• Color of laser: Blue-violet which was developed
by SHUJI NAKAMURA at NICHIA
COPERATION

7. 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.

8. What are Blu-
ray Discs?• Blu-ray is a format for storing data on
optical disks
• Data is written using a blue violet laser,
giving the format its name
• Using the blu-ray format,25
Gigabytes(GB) of data can be written onto
a single-layer, single-sided disk, as
opposed to 4.7 GB on a DVD or 15 GB on a
HD DVD

9. Format of BD
It comes in four different formats:
1. BD-ROM (read only): for reading
recorded content.
2. BD-R (recordable): for PC data storage.
3. BD-RW (rewritable): for PC data storage.
4. BD-RE (rewritable): for HDTV (high
definition television) recording.

10. TYPES OF BD
• SINGLE LAYER:
can hold data up to 25/27 GB that means
2hrs of HD video or about 13hrs of
standard video.
• DOUBLE LAYER:
can hold data up to 50 GB that means
4.5hrs of HD video or about 20hrs of
standard video.

11. THE TECHNOLOGY
• 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.
Disc store digitally encoded data in PITS.

12. THE TECHNOLOGY
So, in blu-ray disc:
• Pit size- 0.15 microns (more than twice
as small as the pits on DVD).
• Track pitch– 0.32 microns
laser needed:- blue-violet laser (450nm)
Data transfer rate: 36Mbps

14. Comparison in BD AND
DVD
BD
• Data is placed on top of a
1.1 mm thick
polycarbonate layer.
• Doesn’t suffer from
LIGHT DAMAGES.
• 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 LIGHT
DAMAGES.
• Suffer from Disc Tilt.
• No such hard coating is
placed.

16. Features of BD
With BD we can:
• Record HDTV without any quality loss.
• Instantly skip to any spot on disc.
• Record any program while watching other on
the disc at once.
• Edit or reorder programs recorded on the
disc.
• Automatically search for an empty on the disc
to avoid recording over the program.
• Access to web to download subtitles and
other extra features.

17. BLU-RAY DURABILITY
ADVANTAGE
• Various hard coating technologies make Blu ray
disc most durable and family-friendly.
• Hard coating technology provides resistances
to:
– Finger prints
– Marks
– Scratches
– Dust
• Much more ROBUST than today’s
polycarbonate-based CD/DVD’s and HD DVD.

18. Blu-ray Density
Advantage
• Higher density
enables better
data seek times.
• Shorter to travel
for same amount
of data results in
the faster data
seek.
• Better for
random access
of data.

19. • Significantly increased storage
space (50GB vs. today's 4.7GB)
• Has the potential to store 500GB on
multiple layers
• Has the potential of up to 54MB/s
read and write speeds
• Allows for high definition 1080p
movies to be market

20. Criticisms
• Critics say Sony is more concerned with
royalties than creating the best technology for
the consumer.
• Manufacturing Blu-Ray discs requires new
machinery, while alternatives like HD-DVD can
be produced on existing DVD equipment.
• In the interest of copy-protection, companies
have included over-protective DRM that has
caused some consumers to experience problems
playing purchased discs in their players.

21. Opinions and the Future of
Blu-ray
• Blu-ray discs will definitely change the
future of the video industry
• The Blu-ray discs have won the battle
against HD DVDs and will continue to grow
• Eventually Replace the DVDs as the
standard disc format
• Enjoying the high-definition quality of Blu-
rays will become a new form of
entertainment in the future