This document discusses holographic versatile discs (HVDs), an advanced optical disc format capable of storing 1 terabyte of data. HVDs use holographic data storage to store information in three dimensions using laser beams, allowing over 10 kilobits of data to be written and read in parallel. Prototype HVDs have achieved storage capacities of 3.9 terabytes and transfer rates of 1 gigabit per second, far exceeding DVD and Blu-ray capacities. The document outlines the technology, structure, writing and reading processes, advantages, applications and future potential of HVDs as a successor to current optical disc formats.

1. ABDULLA RASHARI M K
COMPUTER SCIENCE DEPT
SRINIVAS INSTITUTE OF TECHNOLOGY,MANGALORE

2. Outline
 Introduction
 What is HVD?
 Basics of Holographic memory
 Technology used in HVD
 Structure of HVD
 Writing data
 Reading data
 Advantages, disadvantages and applications of HVD
 Facts
 Future Aspects
 Conclusion
 Reference

3. Introduction
 HVD is an advanced optical disk that‟s presently in
the development stage.
 Storage capacity :- 1 terabyte (TB).
 Data transfer rate :- 1 Gigabit per second.
 The technology permits over 10 kilobits of data to be
written and read in parallel with a single flash.

4. Introduction
 An HVD would be a successor to today‟s Blu-ray and
HD-DVD technologies.
 Advancements in the technology were made, in the
early 21st century.
 Developed by the “Holography Storage Development
Forum”.
 HVD can store up to 60 times the data of a regular
DVD and it can read and write data 10 times faster as
well.

5. What is HVD ?
 Definition:- Holographic versatile disc is a
holographic storage format that looks like a DVD but
is capable of storing far more data.
 Prototype HVD devices have been created with a
capacity of 3.9 terabytes (TB) and a transfer rate of
1 Gbps.
 1 HVD = 5,500 CD-ROMs = 830 DVDs = 160 Blu-
ray discs
 Uses laser beams to store data in 3D.

6. What is HVD ?

7. Basics of Holographic Memory
 Holography is a method of recording patterns of light
to produce a 3D object.
 The recorded patterns of light are called a hologram.
 Creation of a hologram begins with a focused beam of
light, a laser.
 Laser splits up into 2 :-
 Reference beam
 Information beam

8. Technology used in HVD
 Collinear holography – The laser beams are collimated.
 Blue-green laser reads the data encoded in the form of
laserinterference.
 Red laser serves the purpose of reference beam and to read
the servo info.

9. Structure of HVD
 The Holographic Versatile Disc structure consists of
the following components:
 Green writing/reading laser
 Red positioning/addressing laser
 Hologram (data)
 Polycarbon layer
 Photopolymeric layer (data-containing layer)
 Distance layers
 Dichroic layer (reflecting green light)
 Aluminum reflective layer (reflecting red light)
 Transparent base

10. Structure of HVD

11. Writing data
 A simplified HVD system consists of the following
main components:
 Blue or green laser (532-nm wavelength in the
test system)
 Beam splitter/merger
 Mirrors
 Spatial light modulator (SLM)
 CMOS sensor
 Photopolymer recording medium

12. Writing data

13. Writing data
 Information is encoded into binary and is stored in the
SLM.
 These data are turned into ones and zeroes represented
as opaque or translucent areas on a „page‟.
 When the information beam passes through the
SLM, portions of the light are blocked by the opaque
areas of the page, and portions pass through the
translucent areas.
 When the reference beam and the information beam
rejoin on the same axis, they create a pattern of light
interference - the holography data.

14. Writing data
Page Data Hologram made from the Page Data

15. Reading data

16. Reading data
 To read, we‟ve to retrieve the light pattern stored in the
hologram.
 Laser is projected onto the hologram – a light beam that is
identical to the reference beam .
 The hologram diffracts this beam according to the specific
pattern of light interference its storing.
 The resulting light recreates the image of the page data that
established the light-interference pattern – Reconstruction
beam.
 The reconstruction beam - bounces back off the disc, it travels
to the CMOS sensor.
 The CMOS sensor then reproduces the page data.

17. Advantages, disadvantages of
HVD
 Advantages :-
 More storage.
 Reads and writes quickly.
 Price, expected to be slashed down.
 Disadvantages :-
 Initial price of the player and disc are high.
 Price and storage not confirmed, still in R&D.

18. Applications of HVD
 Applications:-
 Used for storing large amounts of data most
likely for large companies.
 Could be the most efficient way to backup
information in the near future.

19. Facts
 It has been estimated that the books in the U.S.
Library of Congress, the largest library in the world
, could be stored on six HVDs.
 The pictures of every landmass on Earth - like the
ones shown in Google Earth - can be stored on two
HVDs.
 With MPEG4 ASP encoding, a HVD can hold
anywhere between 4,600-11,900 hours of
video, which is enough for non-stop playing for a
year.

20. Future aspects
 Have tremendous implications in the
commercial, industrial and d-Cinema realms.
 Will find wide use for backing up and archiving the
media libraries, including the one at the Hollywood
studios.

21. Conclusion
 Materialized with the evolution of the collinear
holography technology.
 Stores far more data than, what a DVD can.
 Prototype HVD has a capacity of 3.9 TB and a
transfer rate of 1 Gbps.
 Hence, 1 HVD = 830 DVDs = 160 Blu-Ray discs.

22. Reference
 [1]. Hideyoshi Horimai and Y.Aoki, “Holographic versatile disc(HVD) System”
 [2]. Optical data storage Topical Meeting 2006, 2006page(s):6-8.
 [3.] Hideyoshi Horimai and Xiaodi Tan,“Holographic Information Storage System:
 [4]. Today and Future,” Magnetics,IEEETransactions on Volume 43/Issue2,part 2
feb2007, page(s):943-947.
 [5]. G. Deepika, “Holographic versatile
disc”http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5738819&isnumber
=5738811
 [6]. http://electronics.howstuffworks.com/hvd.htm
 [7]. http://electronics.howstuffworks.com/hvd1.htm
 [8]. http://electronics.howstuffworks.com/hvd2.htm
 [9]. http://electronics.howstuffworks.com/hvd3.htm
 [10]. http://en.wikipedia.org/wiki/Holographic_Versatile_Disc

23. THANK YOU !!