Introduction - Holographics memory & Holographic Versatile Disc Structure of HVD How HVD Works? Advantages of HVD How HVD compares with other storage devices

1. Presented By:-
Vaibhav bhalotia

2. Table of content
• Introduction.
• What is Holographic memory?
• What is HVD?
• Structure of HVD
• How HVD Works?
• Advantages of HVD
• How HVD compares with other
• Conclusion

3. Introduction01
• 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.

4. What is holographic memory ?02
• It is a memory that can store information in form of holographic
image.
• As current storage techniques such as DVD reach the upper limit
of possible data density (due to the diffraction limited size of the
writing beams), holographic storage has the potential to become
the next generation of storage media.
• Like other media, holographic media is divided into write once
(where the storage medium undergoes some irreversible change),
and rewritable media (where the change is reversible). Rewritable
holographic storage can be achieved via the photo refractive
effect in crystals.

5. Holographic Versatile Disc03
• Holographic Versatile Disc (HVD) is an optical disc technology still
in the research stage which would hold up to 3.9 terabyte (TB) of
information.
• It employs a technique known as collinear holography, whereby
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, to read servo
information from a regular CD-style aluminum layer near the
bottom.

6. Holographic Versatile Disc03
• These discs have the capacity to
hold up to 3.9 terabyte (TB)
• 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 Blu-ray-Discs, and about 8
times the capacity of standard
computer hard drives as of 2007.
• The HVD also has a transfer rate
of 1 gigabyte/s

7. Holographic Versatile Disc structure04
1. Green writing/reading laser (532 nm)
2. Red positioning/addressing laser
(650nm)
3. Hologram (data)
4. Polycarbon layer
5. Photo polymeric layer
(datacontaining layer)
6. Distance layers
7. Dichroic layer (reflecting green light)
8. Aluminum reflective layer (reflecting
red light)
9. Transparent base

8. How HVD works05

9. Advantages of HVD06
1. Resistance to damage - If some parts of the medium are damaged, all
information can still be obtained from other parts.
2. Efficient retrieval - All information can be retrieved from any part of
the medium.
3. 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
CDROM, 830 times the capacity of a DVD, 160 times the capacity of
single-layer Blu-ray-Discs, and about 48 times the capacity of
standard computer hard drives.
4. The HVD also has a transfer rate of 1 gigabit/s.
5. While reading a page the entire page of data can be retrieved quickly
and at one time .

10. HVD Compares With Other Storage Device07

11. Conclusion08
• Capacity increased from 300 Gb
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.