2. o In 2002, around 500 million optical drives and 13
billion disks were sold.
o In 2002, approx. 5 Exabytes (1EB = 1018 bytes) of
unique information per year were produced,
equivalent to 800 megabytes for every man, woman,
and child on earth.
o Digital storage requirements growing at roughly
100% per annum; Development towards an all digital
era.
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3. o Leverages More Data Storage
o 1500 CDs or 200 DVDs Data in Single DVD.
o Optical Storage Method
o Data Stored as Optical Interference Pattern
known as holograms
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4. o Laser beams splits into 2 beams.
o Beams works as object beam and Reference beam.
o To read the stored data, the media is illuminated by
original reference beam.
o Thousands of Holograms can be stored in the same
location by simply changing angle of reference.
o Multiple Data Recording is possible by Using Light at
Different angles
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