Holographic data storage uses lasers and photosensitive materials to store data in three dimensions, allowing for much higher storage capacities than existing magnetic tapes or optical discs. It works by using interference patterns created by splitting a laser into reference and object beams, with the pattern recording data pages in volumes of photosensitive crystals. While it offers terabyte storage capacities and fast data transfer rates, holographic data storage remains expensive compared to existing technologies and may not become widely adopted if another format emerges as the standard.

1. Holographic data storage
Guided by:
Vivek Sharma
Asst. Professor
(CSE/IT)
By:
Rajneesh Khuttack
05310402712
CSE

2. Outline
▪ What is Data Storage?
▪ History of Data Storage.
▪ What is Holography?
▪ Holography Data Storage.
▪ Recording of Data in HDS.
▪ Working of HDS.
▪ Technology Comparison.
▪ Data transfer rate.
▪ Comparison of Storage Discs.
▪ Market Players
▪ Potential Competitors…
▪ Conclusion

3. What Is Data Storage?
Data storage , is a technology consisting
of computer components and recording media used
to retain digital data.
A modern digital
computer represents data using the binary numeral
system. The most common unit of storage is
the byte, equal to 8 bits.
For example, the complete works of
Shakespeare, about 1250 pages in print, can be
stored in about five megabytes (40 million bits)
with one byte per character.

4. History of Storage (Magnetic)
▪ Magnetic
1. Tape
Used for data, video, and audio
Cheap, Ideal for backup
2.Floppy
Same technology as tape
Cheap, small storage size, portable
3.Hard Drives
Faster than tape storage
Still evolving

5. History of Storage (Optical)
Optical
1. Compact Disc
Introduced in 1982.
2.DVD
Initially intended for
Audio/Video use.
3. Blu-Ray
High Disk Space.

6. What is Holography?
Holography is a technique that enables a light field,
which is generally the product of a light source
scattered off objects, to be recorded and later
reconstructed when the original light field is no longer
present, due to the absence of the original objects.
The overall process requires :-
– Coherent Light Beam
– BeamSpliter
– Mirror
– Photographic Plate

7. Construction Of Hologram Reconstruction of Hologram

8. Holographic Data Storage - HDS
▪ Holographic data storage is a potential
technology in the area of high-
capacity data storage in the form of multiple
images in the same area utilizing light at
different angles recording bits in parallel.
▪ Holographic data storage contains information
using an optical interference pattern within a
thick, photosensitive optical material
▪ The stored data is read through the reproduction
of the same reference beam used to create
the hologram

9. Working of HDS
Spatial Light Modulator
(SLM)
A spatial light modulator
is used for creating binary
information out of laser
light. The SLM is a 2D plane,
consisting of pixels which
can be turned on and off to
create binary 1.s and 0.s.

10. Working of HDS
Writing
The light is split in two by the
beam splitter. The signal or object
beam will bounce off a mirror and
passes through a SLM.
The reference beam, on the other
hand, takes another course towards the
crystal and upon hitting it along with
the object beam, creates an
interference pattern that will be used
to store the information relayed by the
object beam in a certain location in
the crystal.

11. Working of HDS
Retrieving:
The interference pattern induces
modulations in the refractive index
of the recording material yielding
diffractive volume gratings.
The reference beam is used during
readout to diffract off of the
recorded gratings, reconstructing
the stored array of bits.
The reconstructed array is
projected onto a pixelated detector
that reads the data in parallel

12. Working of HDS
Multiplexing
Method of storing multiple pages of data in the hologram is called
multiplexing. The
thicker the volume becomes, the smaller the modifications to the source
beam can be.
There are different types of multiplexing
▪ Angular Multiplexing
▪ Wavelength Multiplexing
▪ Spatial Multiplexing
▪ Peristrophic Multiplexing
▪ Shift Multiplexing
▪ Phase-Encoded Multiplexing

13. Technology Comparison
Data are recorded on to the surface
as bit by bit
in CD/DVD System
1 Bit
Data
Surface
Recording
Layer
Substrate
Conventional Optical Disc
Page-
Data
Volumetric
Recording
Layer
Page data are recorded into the
volumetric recording layer
in Holographic recording
HVD
~1μm

14. Data Transfer Rate
1985 1990 1995 2000 2005 2010 2015
AvailabilityYear
1M
10M
100M
1G
10G
100G
DataTransferRate,bits/sec
Blu-ray HD
DVD
0.1M
DVD
Tape
HISHDD

15. Reasons for Developing HDS…
▪ Replacement as a backup media
Higher data density than tape and current Hard Drives.
Data is stable for an estimated 50 years without degrading.
Faster read and write speeds.
▪ Replacement for DVD
Higher data density than Blu-Ray.
Faster read and write speeds.
Higher ceiling for max data storage capability.
Increasing resolutions for TVs will require more storage for movies
and games.

16. Benefits of HDS
▪ Three-dimensional data storage will be able to store more
information in a smaller space and offer faster data
transfer times.
▪ Unlike other technologies that record one data bit at a
time, holography records and reads more than a million
bits of data with a single flash of light.
▪ This enables significantly higher transfer rates than
current optical storage devices.
▪ High storage densities and fast transfer rates, combined
with durable, reliable , low-cost media, mean that
holography is poised to become a compelling choice for
next-generation storage.

17. Drawbacks of HDS
▪ Not a guaranteed market leader:
If another technology becomes the industry
standard then read/write
equipment will be hard to find
▪ Expensive development:
Existing technology is becoming better and cheaper
It is difficult to market a product that is more
expensive per GB of storage.

18. COMPARISION OF STORAGE DISCS:
Blu-ray HD-DVD HVD
Initial cost
for recordable
disc
`800 approx. `400 approx. `5000 approx.
Initial cost
for recorder/
player
`90,000 approx. `90,000 approx. `1,30,000
approx.
Initial storage
capacity
54GB 30GB 300GB
Read/Write
speed
36.5 mbps 63.5 mbps 1 gbps

19. Market Players
▪ InPhase Technologies: Introduced the
world's first commercial holographic
drive and media(Tapestry 300r).
▪ General Electric: In the process of
developing a new holographic optical
storage disc, which would support up
to 500GB of data.
▪ Optware: Holographic Versatile Card
developed by Optware .

20. Potential Competitors…
▪ Similar technologies that may end up in a "format
war"
-UV or X ray discs:
Utilizing a laser with a smaller wavelength
allows for greater storage.
-3D optical discs:
Stores data in three dimensions for greater
data density.

21. Conclusion…
In conclusion, Holographic Storage has the advantage over
other storage mediums as it relates to:
-Storage Capacity
-Transfer Rate
-Backup
Its main disadvantage is its cost of ownership.
Keep in mind, when Blu-ray was Introduced in 2006, a 25-
gigabyte disc cost nearly $1 a gigabyte. Its about half
the cost now. Overtime, the overall cost of holographic
data storage should decrease to an acceptable amount.

22. References…
▪ www.ibm.com.
▪ http://www.riedelit.com/Data_Recovery_Technical_Guide.html
▪ http://www.usbyte.com/common/optical_data_storage_systems.html
▪ www.howstuffworks.com/
▪ www.mediastoragedevices.com/holographic-versatile-disc.html
▪ Kevin Kurtis from Iphase technologies.
▪ http://www.answers.com/topic/holographic-versatile-disc
▪ http://www.hvd-forum.org/abouthvd/technology.html

23. THANK
YOU…