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Blu-Ray? What is it?

So-called Blu-Ray—technically it should be called violet-ray, but who wants to get technical?—is an optical disc format that has more than five and a half times the storage capacity of a standard DVD (25 GB versus 4.5 GB). A dual-layer Blu-ray disc can hold up to 50 GB of information. With that increased storage, movie studios can now provide movies on disc in high definition, offering six times the resolution of DVD and up to eight channels of lossless (much better than CD quality) digital sound. The new format can also provide interactive features that go well above anything ever offered previously.

Blu-ray discs are the same size as DVDs or CDs, but use a "blue" laser to store and read data as opposed to the red laser used in DVDs and CDs. The "blue" laser's shorter wavelength, combined with a smaller aperture lens and a thinner cover layer on the disc makes it possible to create a smaller beam spot size capable of storing and reading much more, smaller information on the disc. A single-layer Blu-ray disc can hold 25 GB worth of data, compared to 4.5 on a standard DVD. A dual layer BD disc holds up to 50 GB. This translates into the ability to store a full 1080p HD image. This has a resolution consisting of 1920 by 1080 progressively scanned pixels, compared to standard DVD's 720 by 480 pixels. In addition, Blu-ray has much wider bandwidth than DVD, delivering signals at speeds up to 48 Mbps, six times faster than DVD's 8 Mbps, and nearly 2.5 times the data of an HDTV broadcast's 19.2 Mbps.

Does it all make sense now? :p

G-man;1267859 wrote: Blu-Ray? What is it?

So-called Blu-Ray—technically it should be called violet-ray, but who wants to get technical?—is an optical disc format that has more than five and a half times the storage capacity of a standard DVD (25 GB versus 4.5 GB). A dual-layer Blu-ray disc can hold up to 50 GB of information. With that increased storage, movie studios can now provide movies on disc in high definition, offering six times the resolution of DVD and up to eight channels of lossless (much better than CD quality) digital sound. The new format can also provide interactive features that go well above anything ever offered previously.

Blu-ray discs are the same size as DVDs or CDs, but use a "blue" laser to store and read data as opposed to the red laser used in DVDs and CDs. The "blue" laser's shorter wavelength, combined with a smaller aperture lens and a thinner cover layer on the disc makes it possible to create a smaller beam spot size capable of storing and reading much more, smaller information on the disc. A single-layer Blu-ray disc can hold 25 GB worth of data, compared to 4.5 on a standard DVD. A dual layer BD disc holds up to 50 GB. This translates into the ability to store a full 1080p HD image. This has a resolution consisting of 1920 by 1080 progressively scanned pixels, compared to standard DVD's 720 by 480 pixels. In addition, Blu-ray has much wider bandwidth than DVD, delivering signals at speeds up to 48 Mbps, six times faster than DVD's 8 Mbps, and nearly 2.5 times the data of an HDTV broadcast's 19.2 Mbps.

Does it all make sense now? :p


No, the old VHF standard was 405 line and the current UHF is 625 line - does DVD really go backwards to 480 line resolution?

Does it all make sense now?




What would make more sense is to make the plunge and start encoding the disc's so they cant be duplicated. Then they can stop wasting their time suing people they will never recoup the money it cost them to sue in the 1st place.

Then they should commit to Blu Ray and start putting more BR films on the shelf so they can earn back the money it cost them to encode.

Ive got it all figured out G guy.

Nomad;1267956 wrote: What would make more sense is to make the plunge and start encoding the disc's so they cant be duplicated. Then they can stop wasting their time suing people they will never recoup the money it cost them to sue in the 1st place.

Then they should commit to Blu Ray and start putting more BR films on the shelf so they can earn back the money it cost them to encode.

Ive got it all figured out G guy.


You make a valid argument... and good for you, Nomad! :wah: