HOLOGRAPHIC VERSATILE DISC

ABDULLA RASHARI M K

COMPUTER SCIENCE DEPT

SRINIVAS INSTITUTE OF TECHNOLOGY,MANGALORE

OutlineIntroductionWhat is HVD?Basics of Holographic memoryTechnology used in HVDStructure of HVDWriting dataReading dataAdvantages, disadvantages and applications of HVDFactsFuture AspectsConclusionReference

IntroductionHVD 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.

IntroductionAn 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.

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.

What is HVD ?

Basics of Holographic MemoryHolography 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

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.

Structure of HVDThe 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

Structure of HVD

Writing dataA 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

Writing data

Writing dataInformation 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.

This interference pattern is stored in the photopolymer area of the disc

as a hologram.

Writing data

Page Data Hologram made from the Page Data

Reading data

Reading dataTo 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.

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.

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.

FactsIt 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.

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.

ConclusionMaterialized 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.

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

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