Holographic data storage was invented in 1948 and promises to be the data storage system of the future. It can store up to 1000 GB of data in a 1 cm3 recording medium by recording information throughout the volume using light at different angles. During recording, two laser beams intersect inside a crystal to create an interference pattern. During readout, only a reference beam is needed, which interacts with the interference pattern to recreate the data. Holographic storage allows for faster read/write speeds and longer archival life compared to existing technologies, but challenges remain in developing inexpensive recording materials and parallel recording methods.

1. HOLOGRAPHIC DATA STORAGE
Name : Krishna kumar Pankaj
Roll No : 13/IT/22

2. INTRODUCTION
The Holography technique was invented in 1948 by the Hungarian
Dennis Gabor
 This technique have been evolving in the last few years.
 A hologram is a 3D image produced form a pattern of
interference.
 It promises to be the data storing system of the future.

3. WHAT IS HOLOGRAPHIC DATA STORAGE
It is a storage that records information throughout the volume of
the medium and is capable of recording multiple images in the
same area utilizing light at different angles.
 Storage System that can store up to 1000 GB of data into a 1 cm3
recording medium.

4. HOW DOES IT WORK ?
 Two beams come to the crystal
and meet at a specific angle.
 The beams create an interference
pattern inside the crystal.
The pattern is recorded inside the crystal.

5. HOW DOES IT WORK?
 For read-out only the reference
beam and the crystal are needed.
 Reference beam should be at the
same angle it was when recorded.
 Reference meet with the interference
pattern inside the crystal and the
signal beam is recreated.

6. BASIC COMPONENTS OF THE SYSTEM
Laser
Recording Medium
Mirrors
Spatial light modulator
Beam splitter
Shutters
Iris
Lenses
Half-wave plate

8. WHY THE INTEREST IN
HOLOGRAPHIC DATA STORAGE ?
Increased storage capacity
Increased read/write speed
Stable and reliable
Security Holograms

9. INCREASED SPEED
• Holography allows a million bits of data to be written and read out
in single flashes of light, enabling data transfer rates as high as a
billion bits per second (fast enough to transfer a DVD movie in
about 20 seconds).

10. WHY IT IS SO FAST

11. STABLE AND RELIABLE
Holographic data storage allows us to keep our data stored safely
for up to 50 years, something that both magnetic and optical discs
and tapes cannot quite promise.
Archival life of CD/DVD is 2 to 5 years.

12. SECURITY HOLOGRAMS
Security holograms are labels with a hologram printed onto it for
sale security reasons.
Security holograms are very difficult to forge because they are
replicated from a master hologram which requires expensive,
specialized and technologically advanced equipment.

13. They are used widely in several banknotes around the world, in
particular those that are of high denominations.
 They are also used in passports, credit and bank cards as well as
quality products.

14. CHALLENGES OF HOLOGRAPHIC
DATA STORAGE
The challenge is to find the right recording material-a
photosensitive substance that is both stable and cheap enough to
use commercially.
Because holographic storage is an upcoming technology, will likely
be cost prohibitive compared to traditional storage options
Of course, holographic storage is expected to get cheaper and
better over time.

15. INTERESTING FACTS
It has been estimated that all the books in the U.S. Library of
Congress, could be stored on six (6) HVD's.
The pictures of every landmass on Earth (Google Earth for
example) can be stored on two (2) HVD's.
With MPEG4 ASP encoding, a HVD can hold between 4,600 to
11,900 hours of video, which is enough for non-stop playing for a
year.

16. DRAWBACKS OF HOLOGRAPHIC
DATA STORAGE
Problems with parallel recording.
Spatial light modulators in a low cost system.
Holographic recording is also very data sensitive. You have to keep
the data streaming. It’s not appropriate for partial recordings.

17. CONCLUSION
The future of holographic memory is very promising. The
holographic storage provide high data density. It can easily store
1000GB of data in a small cubic centimeter crystal reducing the
cost on the other hand. It may offer high data transfer rate.
But even then the holographic way of storing data is still at the
base stage and it may take another couple of years for this
technique to hit desktop with a real life data storage solution.