What is HVD?
How it work?
Compare with other devices.
What is HVD ?
Holographic Versatile Disc (HVD) is an
optical disc technology which would hold
up to 3.9 terabytes (TB) of information.
It employs a technique known as
In collinear holography there are two type
of laser beam.
Red beam(Information beam)
Green beam(Refrence beam)
This two beams are collimated in a single
The green laser reads data encoded as
laser interference fringes from
holographic layer near the top of the disc.
while the red laser is used as the
reference beam and to read servo
information from a regular CD-style
aluminum layer near the bottom.
A dichroic mirror layer between the
holographic data and the servo data
reflects the green laser while letting the
red laser pass through.
It has similar to CD-DVD structure. It is
differs to use laser beams & its pulse
The Components are like …
blue or green laser(532 nmwl),
red laser ,beam splitter, mirrors
special lights modulator(SLM),
C-MOS sensor ,photo polymer
How it works?
Current optical storage saves one bit
per pulse & the HVD hopes to improve
this efficiency with capability of around
Truncated cone shape that has 200
micrometer diameter at the bottom &
500 micrometer diameter at top.
Data is created to fire laser beam into the
beam splitter to produce 2 beam.
1.Reference beam ( Directed to away
from the SLM).
2.Information beam ( Direct toward –
the SLM ).
The 0’s & 1’s data pages are translated
into the pixel of the special light
modulator that either block or tr-
A memory system isn't very useful if you
can't access the data you've stored.
Capacity, Speed, Cost Comparison
Capacity Reading Approx.
Versatile 300 GB–
1 GB/s $120 $3000
Blu-ray 25 GB– 36.5
DVD– 5 GB–
HD-DVD 30 GB
Compact 783 MB– 36.5
HVD have the capacity to hold up to 3.9
terabytes (TB) of information, which is
approximately 5,500 times the capacity
of a CD-ROM,830 times the capacity
of a DVD,160 times the capacity of
single-layer Blu-ray Discs, and about 4
times the capacity of the largest
computer hard drives as of 2007.
The HVD also has a transfer rate of 1
Gbit/s (128 MB/s).
It has been estimated that the books in
the U.S. Library of Congress, one of the
largest libraries in the world, would
contain a total of about 20 terabytes if
scanned in text format. Not including
images from the books, the content
could be stored with capacity to spare
on six 3.9 TB discs.
Using MPEG4 ASP encoding, a 3.9 TB
HVD could hold 4,600–11,900 hours of
video—just over one year of
uninterrupted video at usual encoding
Using typical satellite radio encoding
(CT-aacPlus at 40 kbit/s), a 3.9 TB HVD
could hold over 26.5 years of
uninterrupted stereo audio.
Holography memory has
been around for more than 40 years
but several characteristic made it
difficult to implement , now progras
of HVD make it easy to implement.
It is not available in market.
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Development, Vol 44, No 3, 2000, pp 341-368
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Psaltis, Demitri and Mok, Fai. “Holographic Memories” Scientific American, Nov.
1995, pp 70-76
Schwartz, Karen D. “HVD: Coming to a Storage Device Near You” eWeek, Feb. 3,
“Blue laser media offers terabytes on a disc” Mar. 12, 2004.
“Ecma International creates TC44 to standardize Holographic Information Storage
“Holographic Disk is Quickly Searchable” Laser Focus World, Feb. 2003, p 17
“Holographic Storage Takes a Step Toward Viability” Photonics Technology World