Computer Media--Blank CDs
and DVDs
The compact
disk, or CD, is a popular form of digital media used
for permanently storing computer files, music, pictures, and
virtually any other binary data. The plastic platter is read
and written to by a laser beam. It is available in several
varieties including CD-ROM, CD-R, and CD-RW. |
DVD Brief History
In the early
1990s, there were two high density optical storage standards
being developed. One idea was the MultiMedia Compact Disc
(MMCD) backed by Philips and Sony. The other was the Super
Density Disc (SD), supported by Toshiba, Time-Warner,
Matsushita Electric, Hitachi, Mitsubishi Electric, Pioneer,
Thomson, and JVC. IBM's president, Lou Gerstner, acting as a
kind of mediator, led an effort to unite the two camps
behind a single standard. He remembered and did not want to
repeat the costly format war between VHS and Betamax in the
1980s.
Philips and
Sony abandoned their MMCD format and finally agreed upon
Toshiba's SD format with two modifications both related to
the tracking technology. The first one was the adoption of a
pit geometry that allows "push-pull" tracking, a proprietary
Philips/Sony technology. The second modification was the
adoption of Philips' EFMPlus. EFMPlus, created by Kees
Immink, who also designed EFM, is 6% less efficient than
Toshiba's SD code, which resulted in a capacity of 4.7 Gbyte
instead of SD's original 5 Gbyte. The great advantage of
EFMPlus is its great resilience against disc damage such as
scratches and fingerprints. The result was the DVD
specification Version 1.0, announced in 1995 and finalized
in September 1996.
Blank computer media is
available almost anywhere today including even grocery
stores. If you are looking for great prices on bulk blank
computer media then the web is the place to shop. Check out
the links on computer media here to find the best prices and
highest quality.
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