Blu-Ray disc technology
Frequently asked questions:
1. What is Blu-ray?
Blu-Ray is the name of the next generation disc recording and playback format.
2. What capacity will a Blu-ray disc have?
The single sided discs are expected to hold up to 27GB of data or 13 hours of film and will be available
in a recordable format. The recording technology works in the same way as current DVD players but the new Blu-ray drives will use a blue laser to read the discs. Blue lasers have a shorter wavelength (405 nanometer) than the red lasers used in DVD (650 nanometer) allowing them to focus on a smaller area. This means that more information can be stored onto the disc.There are plans that by utilising single sided dual layer technology the eventual capacity could rise to 50GB per disc.
3. Will there be writable, re-writable and read only versions just like CD and DVD?
Yes, BD-R write once, BD-RE re-writable and BD-ROM read only.
4. Will the Blu-ray recorders be able to play other disc technologies?
Despite the different lasers used it is likley that Blu-ray recorders will be made compatible and allow playback of CD's and DVD's.
5. Why the need for so much capacity?
Apart from the usual answer that technology always find some way to increase to the capacity available, the widespread introduction in Japan and eventually throughout the World of high definition broadcast
TV, means that DVD will simply not have the capacity to record for any length of time at this new 'data hungry' standard. A Blu-Ray disc would store 13 hours of standard definition TV but only 2 to 3 hours
of High Definition TV.
6. Who is behind the technology?
Sony, Matsush*ta, Hitachi, Pioneer, Sharp, Samsung, LG, Philips and Thomson have all pooled their rescources and hope to make this a definitive standard, unlike DVD which has two competing standards DVD-R and DVD+R. There is a another format being proposed by Toshiba and NEC called Advanced Optical Disc (AOD) but with such a large number of supporters in the Blu-ray camp it is expected that
Blu-ray will be the dominant and adopted standard.
7. Will the discs look similar to a CD or DVD?
Yes at 12CM diameter the same dimension but they are likely to be encased in a cartridge to protect them from dust and finger marks.
8. 27GB how long will it take to record?
At 1x speed recording it would take about 1 hour 35 minutes for a full disc but companies are already working on 2x speed recorders which would cut this time in half.
9. When are the recorders and discs likely to become widely available?
The hardware is still being developed and it is not expected to become available until 2005.
Initially Blu-ray is expected to be a complimentary technology to DVD and it's introduction will not simply force DVD out of the market. Eventually though it is expected that it will replace VCR and current DVD technology as well as becoming the standard format for PC data storage and high definition film.
Initial publicity quotes recorders at $3,800 and discs at $30 each.
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Emne: Lancering af CD-DVD
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blot lidt svært at gennemskue hvor det hele går imod. Nu kommer bluray jo også inden for nogle måneder.
