| Blu-ray - The Next Generation Media Format |  Blu-ray, a next-generation optical disc format, also known as Blu-ray Disc (BD). Blu-ray has a storage capacity of 25GB on a single-layer disc and 50GB on a dual-layer disc. While DVD, DVD-R, DVD+R rely on a red laser to read & write data, Blu ray disc uses a blue-violet laser instead. The benefit of using a blue-violet laser (405nm) is that it has a shorter wavelength than a red laser (650nm), which makes it possible to focus the laser spot with even greater precision. This allows data to be packed more tightly and stored in less space, so BR-D can fit more data even though it's the same size as a CD/DVD.
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BD-R (write-once type) and BD-RE (rewritable type) Blu-ray Discs.
There are 4 new products of Blu-Ray Disc:
BD-R25 (single-side, single-layer, 25GB), BD-R50 (single-side, dual-layer, 50GB),
BD-RE: BD-RE25 (single-side, single-layer, 25GB) and BD-RE50 (single-side, dual-layer,
50GB).
The Blu-Ray BD-R write-once type, 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 Blu-Ray 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.
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