The document discusses Holographic Versatile Discs (HVDs) and Blu-Ray discs. HVDs can store up to 3.9 terabytes of data using holographic storage, which is far more than DVDs or Blu-Rays. Blu-Ray discs can hold 25-50 gigabytes of data for high definition video. Both technologies offer high storage capacities and transfer rates compared to older formats like DVD, but HVDs are much more expensive. The document compares the features and applications of HVDs and Blu-Ray discs.

1. SEMINAR ON HVD
AND BLU-RAY
DISCS
Vaishnav
Raja

2. Contents_______
1.Holographic Versatile
Disc
A. Peculiarities
B. Working Principle
C. Structure of HVD
D. Advantages
E. HVD- DVD, Blu-ray
F. Facts and Future
2.Blu-Ray Disc
A. Features
B. Applications
C. Formats
D. Types
E. Blu-ray Vs DVD
F. Facts and Future

3. Holographic
Versatile Disc
Holographic versatile disc (HVD) is a
holographic storage format that looks like a
DVD but is capable of storing far more data.
Prototype HVD devices have been created
with a capacity of 3.9 terabytes (TB) and a
transfer rate of 1 gigabit per second (1 Gbps).
At that capacity, an HVD could store as much
information as 830 DVDs or 160 Blu-Ray discs.

4. Peculiarities
• Holographic storage uses laser
beams to store digital data in three
dimensions, rather than in two
dimensions as in CD and DVD media.
• HVD is, essentially, a holographic
layer built on top of a conventional
disc.
• The HVD process uses a blue-green
laser beam, used for reading and
writing data, collimated (made
parallel) with a red laser
beam, which is used for servo and
tracking.
The above features increase the
capacity of the discs.

5. Working Principle
 HVD uses a technology called ‘collinear
holography’, in which two laser rays, one
is blue-green and the other is red, are
collimated into a single beam..
 The blue-green laser reads data encoded
as laser interference fringes from a
holographic layer near the top of the disk
while the red laser is used as a reference
beam and to read servo information from
a regular CD-style aluminum layer near
the bottom.
 Servo information is used to monitor the
position of the read head over the disc,
similar to the head, track and sector
information on a conventional hard disk
drive.

6. Structure of HVD
The HVD consist of the following
components:
A. Green writing/reading laser(532nm)
B. Red positioning/addressing
laser(650nm)
C. Hologram(Data)
D. Polycarbonate layer
E. Photo polymeric layer(Data containing
layer)
F. Distance layers
G. Dichoroic layers(reflecting green light)
H. Aluminum reflective layer(reflecting red
light)
I. Transparent base

7. Advantages
 High storage capacity of
3.9terabytes(TB) enables users to store
large amount of data.
 Records one program while watching
another on the disc.
 One can edit or reorder programs on
the disc.
 Automatically searches for an empty
space on the disc to avoid recording
over a program.
 Backward compatible: Supports CD’s
and DVDs also.
 The transfer rate of HVD is up to 1GB
per second, which is 40 times faster
than DVD.
Disadvantage:
HVDs are very expensive compared to other
mediums.

8. HVD compared with HD-DVD
and Blue-ray
While HVD is attempting to revolutionize data
storage, other discs are trying to improve upon
current systems. Two such discs are Blue-ray and
HD-DVD, deemed the next generation of digital
storage.
Parameters Blue-Ray HD-DVD HVD
Initial cost of
Aprox. Rs1000/- Aprox. Rs500/- Aprox. Rs6500/-
recordable disc.
Initial Storage
54GB 30GB 300GB
Capacity
Read/Write Speed 36.5Mbps 36.5Mbps 1Gbps

9. Facts AND Future
Prospects
•It has been estimated that the books in the
U.S Library of Congress, the largest in the
world, could be stored on six HVDs.
•The pictures of every landmass on Earth-
like the ones shown in Google Earth- can be
stored in two HVDs.
•With MPEG4 ASP encoding, a HVD can hold
anywhere between 4600-11900 hours of
video, which is enough for nonstop playing
for a year.
•HVDs have tremendous implications in
Industrial, commercial and Dcinema realms.
•HVDs will be found widely used for backing
up and archiving data in different forms.

10. Blu-Ray Disc
Blu-ray (BD) is 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.
Storage capacity of BD is up to 25/50 GB.
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, an everyday
word cannot be a trademark.

11. Features of BD
• Broadest Industry Support: Blu-ray Disc is
supported by leading hardware
manufacturers across the CE and IT fields
from the U.S., Europe, Japan and
Korea, including Dell, HP, Hitachi, LG
Electronics, Matsushita
(Panasonic), Mitsubishi, Pioneer, Philips, Sa
msung, Sharp, Sony and Thomson/RCA.
Finally, major blank media manufacturers
including TDK are supporting the Blu-ray
Disc format as the successor of DVD.
•Life Span: The Blu-ray Disc format is
designed to stay relevant for at least 10
to 15 years. Its high storage capacity of
25 to 50 GB allows for the best-possible
High Definition video quality and
satisfies even the most demanding data
storage needs.

12. Features of BD..
Content Protection: Blu-ray Disc provides
some of the strongest copy protection methods
ever developed for any consumer format. It
makes Blu-ray Disc the best choice for any
content publisher wanting assurance that their
valuable assets are protected from piracy.
Cost: Blu-Ray format is designed to last for a
period of at least 10 to 15 years. Due to its
enormous capacity, short term replacement of
technology is unnecessary. Hence although it
requires a nominal investment in advance, it
provides greater and longer term profit
potential.
Capacity: The Blu-ray Disc format offers the
highest capacity of any consumer media format to
date, also greatly surpassing the capacity of other
format proposals.
Robustness of Disc: As the result of recent
breakthroughs in the development of hard coating
for Blu-ray Disc, the discs offer much stronger
resistance to scratches and fingerprints than other
existing and proposed formats.

13. Blu-Ray Disc Applications
• High Definition Television
Recording
• High Definition Video Distribution
• High Definition Camcorder
Archiving
• Mass Data Storage
• Digital Asset Management and
Professional Storage

14. Formats of Blu-ray Discs
• 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.

15. Types of Blu-Ray Discs
• SINGLE • DOUBLE
LAYERED LAYERED
A. It can hold up A. IT can hold
to 25/27 GB. up to 50GB.
B. 2hrs of HD B. 4.5 Hrs of HD
video Video
C. 13hrs of C. 20 Hrs of
Standard Standard
video. video.

16. Blu-Ray Vs. DVD
Just as DVD meant a five to ten time increase in
storage capacity compared to CD, Blu-ray Disc will
increase DVD capacity by five to ten times. This is
due, among other reasons, to the usage of a blue
instead of a red laser and improved lens
specifications, allowing for a much smaller focus
laser beam which enables the recording of much
smaller and higher density pits on the disc.

17. Due to the fact that the data layer on a Blu-ray
Disc is placed much "closer" to the laser lens
than in DVD (or even the HD-DVD
proposal), there is less distortion resulting in
significantly improved tolerances. Hence, more
precision and ultra high storage densities are
made possible.

18. Facts and Future
prospects
1. Blu-ray is being adopted faster than
the DVD format was at a similar
period in its development.
2. Blu-ray faces competition
from video on demand and from
new technologies that allow access
to movies on any format or device
3. Quad-layer (128 GB) discs have
been demonstrated
*********