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What Is
Blu-ray Disc?
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BD-R 25GB
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BD-R 50GB
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BD-RE 25GB
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BD-RE 50GB
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BD-R
(write-once
type)
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BD-RE
(rewritable
type)
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TDK Corporation has commenced shipments
of mass-production
samples of so-called
bare-type (i.e.,
cartridge-less) versions
of its BD-R (write-once
type) and BD-RE
(rewritable type)
Blu-ray DVD
media. The four
new products include the
BD-R25 (single-side,
single-layer, 25GB) and
BD-R50 (single-side,
dual-layer, 50GB)
write-once types and
BD-RE25 (single-side,
single-layer, 25GB) and
BD-RE50 (single-side,
dual-layer, 50GB)
rewritable types.
For the Blu-ray
Discs, which
achieves significantly
higher density
recording, scratches or
dirt can have fatal
consequences to the
data, so it was
initially introduced
utilizing a protective
cartridge. The BD-R and
BD-RE
Blu-ray Discs
launched this time make
use of DURABIS 2,
TDK originally developed
hard coating technology.
This achieves a
recording surface with
extremely high
resistance to scratches
and dirt (particularly
fingerprint smudges),
thus enabling
anxiety-free use of a
cartridge-less disc.
For the forming of the
cover layer above the
disc's recording layer,
an original
high-precision spin
coating is utilized,
realizing smoothness at
the nano-level while
achieving stabilized
recording and playback
characteristics.
The BD-R write-once
type, moreover, makes
use of an inorganic
material in the
recording layer,
entirely different from
the organic dye used in
previous types of
write-once type discs.
Because the recording
layer is not affected by
light, it realizes a
disc with outstanding
archivability.
Furthermore, the BD-RE
rewritable type utilizes
a high-sensitivity
phase-change material
that realizes stabilized
characteristics, in the
form of a low error
rate, even after 10,000
overwrites.
In addition, the
single-sided, dual-layer
disc realizing 50GB
capacity harnesses
high-precision stacking
technology resulting
from years of work at
optical disc
development, to achieve
precision forming of its
respective functioning
layers. The upper layer
(Layer 1) and lower
layer (Layer 0) are
combined in terms of
high sensitivity and
recording layer
transparency ratio,
realizing stabilized
recording and playback
characteristics.
The commitment of TDK's
advanced optical disc
technology has resulted
in creation of the
world's first 25GB and
50GB high-capacity discs
capable of 2X recording
speed. TDK is confident
that the BD-R and BD-RE,
freed from the confines
of a cartridge, will
offer their large
capacities with greater
facility, thus greatly
expanding the potential
of optical recording. |
