We can say that blu-ray is an advance version of DVD. Created
for recording and playing back high-definition videos and for storing huge
amount of data. Normally a CD can hold
700MB of data and a basic DVD can
hold 4.7 GB of data, while a single Blu-ray disc able to hold up to 25 GB data
at once. Even a double sided, dual layer DVD not common can only hold 17 GB of
data. Dual-layer Blu-ray discs will be able to store 50 GB of data. Approximate
equal to 4 hours of HDTV,
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Blu-ray discs can hold more information than other optical media as of the blue lasers the drives use. The laser is actually blue-violet, but "Blu-ray" rolls off the tongue a little easier than
"Blu-violet-ray." The blue-violet laser has a shorter wavelength than the red lasers used for CDs and DVDs (405nm compared to 650nm). This allows the laser to focus on a minor area, which makes it possible to study much more data on a disc the same size as a CD or DVD. Proponents of the Blu-ray format say they expect Blu-ray devices to replace VCRs.
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