Blu-ray discs
(also known as 'BD'), are a next-generation
optical disc format jointly developed by the Blu-ray
Disc Association (BDA).
The Blu-ray format offers more than five times
the storage capacity of traditional DVDs and
can hold up to 25GB on a single-layer disc and
50GB on a dual-layer disc by using a blue laser
with a shorter wavelength of 405nm (DVDs use
a longer 650nm wavelength red laser and CDs are
longer still at 780nm). The shorter wavelength
of the Blu-ray system allows the laser to focus
on smaller spots and so the pits and spiral groove
in the discs can be made even smaller and tighter. |
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Blu-ray discs are exactly the same
physical size as DVDs, CDs and HD-DVD discs at 12cm
in diameter and 1.2mm in thickness.
The diagram below
shows the difference between single and dual layer
Blu-ray discs :
| Single layer Blue-ray
(25GB) |
Dual layer Blu-ray (50GB) |
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The Blu-ray Disc Association is
a group of electronics and media manufacturers that
include Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi,
Panasonic, Pioneer, Philips, Samsung, Sharp, Sony,
TDK and Thomson. The Blu-ray format was developed
for the recording, rewriting and playback of high-definition
video (HD), in addition to storing large amounts
of data.
Blu-ray discs are currently competing
with HD
DVD discs as a future replacement for
the DVD format.
Below is a diagram
illustrating the difference in track pitch between
DVDs and Blu-ray discs:
Wizbit do not currently provide
Blu-ray duplication services, but hope to introduce
this service in spring 2007. Please contact
us for
further information.
View other CD
and DVD production FAQs.
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