Holographic memory is a 3D data storage technique that can store large amounts of information at high density inside crystals or photopolymers. Holographic Versatile Disc (HVD) is an optical disc technology still in development that employs holographic memory and could hold up to 3.9 terabytes of data. HVD uses a technique called collinear holography with two lasers to encode data as interference fringes in a holographic layer, allowing for much greater storage capacity compared to CDs, DVDs, or hard drives. HVDs offer advantages like efficient parallel retrieval of all stored data, resistance to damage, and transfer rates over 1 gigabit/second

1. Holographic Memory
Name : Mohit Vaghela
Roll No :- 65

2. Introduction
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.

3. WWhhaatt iiss HHoollooggrraapphhiicc MMeemmoorryy ??
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.

4. HHoollooggrraapphhiicc
VVeerrssaattiillee DDiisscc
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 and to read servo information from a
regular CD-style aluminum layer near the bottom.

5. HHoollooggrraapphhiicc
VVeerrssaattiillee DDiisscc
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 Blu-ray-Discs, and about
8 times the capacity of standard
computer hard drives as o f 20 0 7 .
The HVD also has a transfer rate of
1gigabyte/s

6. The HVD System:
Writing Data
 The process of writing information onto an HVD
begins with encoding the information into
binary data to be stored in the SLM. These data
are turned into ones and zeroes represented as
opaque or translucent areas on a "page" -- this
page is the image that the information beam is
going to pass through.

7. AAddvvaannttaaggeess ooff HHVVDD
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 CD-ROM,
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 .

8. Road Map of HVD

9. CCoonncclluussiioonn
• Capacity increased from 300 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.

10. Thank You