What are blu-ray disks?

Answer 1

Basically they're high definition DVDs that play exclusively on Blu-Ray players. Here's some additional info...

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Answer 2

Blu-ray disks have more capacity than normal DVD's

Normal DVD's are scanned using a Red laser, while Blu-ray disks are read using a Blue laser beam.

Answer 3

blu-ray disks are one of two competing High Definition DVD technologies. The other one is called HD DVD. Just wait it out...By the way Blu-ray and HD DVD players cannot play regular DVD's

Answer 4

Blu-ray, also known as Blu-ray Disc (BD), is the name of a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA), a group of the world's leading consumer electronics, personal computer and media manufacturers (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson). The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. The 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. This extra capacity combined with the use of advanced video and audio codecs will offer consumers an unprecedented HD experience.

While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM rely on a red laser to read and write data, the new format uses a blue-violet laser instead, hence the name Blu-ray. Despite the different type of lasers used, Blu-ray products can easily be made backwards compatible with CDs and DVDs through the use of a BD/DVD/CD compatible optical pickup unit. 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 it's possible to fit more data on the disc even though it's the same size as a CD/DVD. This together with the change of numerical aperture to 0.85 is what enables Blu-ray Discs to hold 25GB/50GB.

Answer 5

High Definition DVDs. The competing format to HD-DVD. They hold many times more data than a standard DVD, so they display more pixels for HDTVs.

Answer 6

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