This document discusses holographic memory and Holographic Versatile Discs (HVDs). Holographic memory can store information at high density inside crystals or photopolymers. HVDs use two lasers - a green laser for reading/writing and a red laser for positioning. HVDs have the potential to store up to 3.9 terabytes of data, which is significantly more than current storage methods. They also allow for faster retrieval of entire pages of data at once. However, holographic storage faces challenges from emerging high-capacity alternatives and high initial costs.

1. Presented by:-
CH.MANASA & P.SWATHI
86116010 & 86116034.
Presented to:-
Asst.prof.HARMAN REET KAUR.

2. 1.Introduction
2. What is Holographic memory
3. DNA Hologram
4.Global view of Hologram
5.What is HVD?
6. Structure of HVD.
7. How HVD Works?
I. Writing Data
II. Reading Data
8. Advantages of HVD
9.Disadvantages of HVD
10.Applications of Holographic
11. How HVD compares with other
storage device?
12. Conclusion
Contents:-

3. •As computer systems continue to become faster, they will
need a way to access larger amounts of data in shorter
periods of time.
•Holographic memory is a three-dimensional data storage
system that can stored information at high density inside the
crystal or photopolymer.
•Hence holographic storage system has the potential to
became the next storage generation over conventional
storage system.
INTRODUCTION:-

4. What is Holographic memory?
It is a memory that can
store information in form
of holographic image.
 It is a technique that can
store information at high
density inside crystals or
photopolymers.

5.  As current storage
techniques such as DVD reach
the upper limit of possible
data density holographic
storage has the potential to
become the next generation of
storage media.
 Rewritable holographic
storage can be achieved via
the photo refractive effect in
crystals.
Holographic memory

6. DNA HOLOGRAM

7. Global view of Hologram

8. •Holographic Versatile Disc (HVD) is an optical disc
technology
•This technique known as collinear holography
•There are two lasers, one red and one blue-green, are
collimated in a single beam.
•The blue-green laser reads data encoded as laser
interference fringes from a holographic layer near the top of
the disc while the red laser is used as the reference beam
and to read servo information from a regular CD-style
aluminum layer near the bottom.
HVD

9. 1. Green writing/reading laser
(532 nm)
2. Red positioning/addressing
laser (650 nm)
3. Hologram (data)
4. Polycarbon layer
5. Photo polymeric layer
(data-containing layer)
6. Distance layers
7. Dichroic layer (reflecting
green light)
8. Aluminum reflective layer
(reflecting red light)
9. Transparent base
Structure of HVD

10. How HVD Works?
HVD
Writing
Data
Reading
Data

11. Writing Data

12. Reading Data

13. Advantages of HVD
• Resistance to damage - If some parts of the medium are
damaged, all information can still be obtained from other parts.
• Efficient retrieval - All information can be retrieved from any
part of the medium.
• The HVD also has a transfer rate of 1 gigabit/s.
• While reading a page the entire page of data can be retrieved
quickly and at one time
• These discs have the capacity to hold up to 3.9 terabyte (TB) of
information, which is approximately 6,000 times the capacity
of a CD-ROM, 830 times the capacity of a DVD, 160 times the
capacity of single-layer Blue-ray-Discs, and about 48 times the
capacity of standard computer hard drive

14. Disadvantages of HVD
•Current data storage options on the market such
as ‘blu- ray’ disks can compete with projected
storage capacities of holographic data storage.
• We believe this make companies less eager to
invest in holographic data storage if current
technologies can compete.
•There are already emerging storage devices such
as 3D optical data storage, similar to to holography
but can store more data, specifically up to
petabytes ( 1000 TB ) of data.

15. Applications of Holographic
•Holographic memory systems can potentially
provide the high-speed transfers and large
volumes of future computer systems.
•One possible application is data mining.
•Data mining is the process of finding patterns in
large amounts of data.
•Data mining is used greatly in large databases
which hold possible patterns which can't be
distinguished by human eyes due to the vast
amount of data.

16. . How HVD Compares With Other Storage Device?
Blu-ray HD-DVD HVD
Initial cost
for
recordable
disc
Approx. $18 Approx. $10 Approx. $120
Initial cost
for
recorder/play
er
Approx.
$2,000
Approx.
$2,000
Approx. $3,000
Initial
storage
capacity
54 GB 30 GB 300 GB (max 3.9 TB)
Read/write
speed
36.5 Mbps 36.5 Mbps 1 Gbps

17. Graphical picture of HVD

18. Working Model Of A Holographic Storage

19. Conclusion
• Capacity increased from 3oo Gbyte to 3.9 TB
• No need to turn over the CD,DVD,HD-DVD,etc.
• Three-dimensional data storage ,store information
• in a smaller space and faster data transfer times .
• The HVD playing device would have data rates 25
• times faster than today's fastest DVD players.