Reference Information
14-10
Samsung Electronics
14-4 Blu-ray Disc
14-4-1 Evolution of consumer optical discs
14-4-2 Blu-ray Disc and DVD
Just as DVD meant a 5 to 10 times increase in storage capacity compared to CD, Blu-ray Disc will increase DVD
capacity by 5 to 10 times. This is due, among other reasons, to the usage of a blue instead of a red laser and
improved lens specifications, allowing for a much smaller focus laser beam which enables the recording of much
smaller and higher density pits on the disc.
• Due to the fact that the data layer on a Blu-ray Disc is placed much "closer" to the laser lens than in DVD (or
even the HD-DVD proposal), there is less distortion resulting in significantly improved tolerances.
Hence, more precision and ultra high storage densities are made possible.
• As a result of Blu-ray Disc being manufactured as a single substrate disc comparable to CD, but unlike
DVD (and the HD-DVD proposal), the manufacturing process does not involve the bonding of two substrates,
resulting in less production material, a shorter production time and hence lower production costs per disc.
• Blu-ray Disc has the same physical characteristics as DVD and CD, and like its predecessors it also does not
require a cartridge. This makes it possible to create Blu-ray Disc products that are backwards compatible with
CD and DVD, allowing for a seamless transition to the new technology. Likewise, the technology is perfectly
suitable for integration in small form factor equipment, like notebook computers.
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