Dual layer DVD Burners
Are you searching for Dual layer DVD Burners?
We have a wide variety of Dual layer DVD Burners from leading manufacturers.
Taiyo Yuden Media:
Dual layer DVDs featuring
superior Rimage CD DVD Printers. 
We will meet your needs with our line of CD/DVD products. The
technology behind CD-RW is optical phase-change, which in its own right
is nothing radical. However, the technology used in CD-Rewritable does
not incorporate any magnetic field like the phase-change technology used
with MO technology. The media themselves are generally distinguishable
from CD-R discs by their metallic grey colour and have the same basic
structure as a CD-R disc but with significant detail differences. A CD-RW
disc's phase-change medium consists of a polycarbonate substrate, moulded
with a spiral groove for servo guidance, absolute time information and
other data, on to which a stack (usually five layers) is deposited.
The recording layer is sandwiched between dielectric layers that draw
excess heat from the phase-change layer during the writing process. In
place of the CD-R disc's dye-based recording layer, CD-RW commonly uses a
crystalline compound made up of a mix of silver, indium, antimony and
tellurium. This rather exotic mix has a very special property: when it's
heated to one temperature and cooled it becomes crystalline, but if it's
heated to a higher temperature, when it cools down again it becomes
amorphous. The crystalline areas allow the metalised layer to reflect the
laser better while the non-crystalline portion absorbs the laser beam, so
it is not reflected.
During writing, a focused "Write Power" laser beam selectively heats
areas of the phase-change material above the melting temperature 500-700
so all the atoms in this area can move rapidly in the liquid state. Then,
if cooled sufficiently quickly, the random liquid state is "frozen-in" and
the so-called amorphous state is obtained. The amorphous version of the
material shrinks, leaving a pit where the laser dot was written, resulting
in a recognisable CD surface. When an "Erase Power" laser beam heats the
phase-change layer to below the melting temperature but above the crystallisation
temperature 200 for a sufficient time (at least longer than the minimum
crystallisation time), the atoms revert back to an ordered or crystalline state.
Writing takes place in a single pass of the focused laser beam; this is
sometimes referred to as "direct overwriting" and the process can be
repeated several thousand times per disc.
More about DVD Production
Equipment. See also: Cd
Packaging Supplies and Dvd Duplicator Towers.
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