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How Blu-Ray Discs are constructed;
use a red laser at 650nm wave length to read DVD discs. As the disc
spins the laser reads the information encoded on the media and
produces an image and sound on your television.
As the name suggests Blu-ray players use a blue laser to read the
stored information. Blue laser wavelengths are shorter than the red
at 405nm and are about two and a half times smaller in diameter than
red lasers. This allows for closer and more precise reading of
information stored on the disc.
Physically, Blu-ray and DVD discs are identical. Both media have
grooves or pits on their bottom layer that enables the laser to
penetrate through and read the stored information.
Since DVDs are read with a red laser the grooves on its underside
need to be wide enough to accommodate the larger wavelength. Because
the grooves are so far apart only 4.7 GB of information can be
stored on each layer of the disc.
grooves on a Blu-ray disc are much thinner and closer together
because the blue laser used to read the disc has a shorter wave
length and is two and a half times thinner than the red laser. This
allows the Blu-ray disc to squeeze almost five times as many grooves
on to a disc exactly the same size as a DVD. The polycarbonate layer
on the bottom of a Blu-Ray disc is much thinner than on a standard
DVD. Therefore, since the data layer is much closer to the surface
of the disc, a hard coating of the pick-up surface was chosen to
protect against scratches.
with the hard scratch coating that is applied to the Blu-Ray disc,
they still become scratched.
The good news is, we do repair
scratched Blu-Ray discs!
However, as they are harder to scratch, they are also harder to
repair and can, on occasion, require additional repair to restore.
Should this be the case we contact you to let you know that an
additional repair will be required on your scratched Blu-Ray or
scratched PS3 disc and await your confirmation.
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