This ppt gives you the basic information about HDS .

2. Overview...
 Introduction
 What is HDS?
 How does it work?
 System
 Recording and Reading the Data
 Storage Medium
 Uses of the System
 Cons and Pros
 Conclusion

3. Introduction
 Generally a Hologram is a 3D image
reproduced from a pattern of
interference.
 The Holography technique was invented
in 1948 by the Hungarian Dennis Gabor.
 Evolving in the last few years.
 Promise to be the data storing system of
the future.

4. Introduction
 Holographic Data Storage is an
advanced data storage concept that
stores information in the form of
holographic images.
 Holographic Data Storage is a
volumetric approach of storing data.
 An HDSS can store 1-4 TB of data on a
sugar-cube sized crystal.

5. Hologram
 The word Hologram is derived from a
Greek word ‘HOLOS’ meaning whole
and ‘gram’ meaning message.
 It tells information about size , shape,
brightness and contrast of object being
recorded.
 It is a 3D image formed by the
interference of light beam from a laser or
other coherent light source.

6. Hologram
 Typically, a hologram is a photographic
recording of a light field, rather than of an
image formed by a lens.
 It is used to display a fully three-
dimensional image of the holograph
subject, which is seen without the aid
of special glasses or other intermediate
optics.
 Holography is the science and practice of
making holograms.

7. What is Holographic Data Storage?
 Holographic data storage is a potential
technology in the area of high-
capacity data storage currently dominated
by magnetic data storage and
conventional optical data storage
 Storage System in which two beams from
the same laser source are used to record
the data into a ‘recording medium’.

8. Technology uses holograms which are created when a light from a
single laser beam is split into two beams

9. HOW DOES IT WORKS?

10. Uses a reference beam and data
beam to create an interference pattern
 While Writing:
 The intersection
of the two
beams causes a
change , which
is then stored
 While Reading
 Action of the
reference beam
and interference
pattern is used to
recreate the data
beam

11. The System
 Basic components of System:
Laser
Recording Medium
Mirrors
Spatial light modulator
Beam splitter
Shutters
Iris
Lenses
Half-wave plate

12. Recording The Data
 Holographic data storage contains
information using an optical interference
pattern within a thick, photosensitive optical
material
 Light from a single laser beam is divided
into two, or more, separate optical patterns
of dark and light pixels.
 By adjusting the reference beam angle,
wavelength, or media position, a multitude
of holograms (theoretically, several
thousand) can be stored on a single
volume.

13. Reading The Data
 The stored data is read through the
reproduction of the same reference beam
used to create the hologram.
 The reference beam's light is focused on the
photosensitive material, illuminating the
appropriate interference pattern, the
light diffracts on the interference pattern, and
projects the pattern onto a detector.
 The detector is capable of reading the data in
parallel, over one million bits at once, resulting
in the fast data transfer rate.
 Files on the holographic drive can be
accessed in less than 0.2 seconds.

14. Uses of the System
 Can be used to store any kind of
information from documents to videos.
 Other fields that uses this system are:
Government sectors
Libraries
Business
and more

15. Storage Medium
 There are mainly two storage mediums used:
Lithium-Niobate Crystal
Photopolymer
Media Parameters:
1.Diffraction efficiency
2.Holographic fidelity
3.Sensitivity
4.Dynamic Range
5.volatility

16. Holographic versatile disc
 HVD is an optical disc technology still in
the research stage which would hold up
to 3.9TB of information.
 It employs a technique known as
Collinear Holography where by two
lasers one red and one blue green are
collimated in a single beam.

17.  which is approx. 6000 times capacity of
CD-ROM,830 times capacity of DVD-
ROM and 160 times capacity of BLU-
Ray disc and 8 times capacity of
computer hard drives.
 Transfer Rate:1 GB/sec.

18. Comparison of HVD with other Storage devices

19. Pros:
**Storage Capacity
High density
small volume
**Effective
Rapid data rate
fast access
**Swift Searching
**Security
**Parallel access
**Longer Storage Life

20. Cons
 Sensitive
 Material limitations
 Noise
 Cost
 Problems with parallel recording

21. Conclusion
 Holographic Data Storage is convenient
and effective way of data storage.
 The HVD playing device would have
data rates 25 times faster than today’s
fastest DVD players.

22. -GANESH
NETHI