a Question

Discussion in 'Computers' started by afgomez, Jan 16, 2003.

  1. afgomez

    afgomez New Member

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    what's the maximum capacity of DVD Discs ?
  2. brc 103

    brc 103 New Member

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    i think this should answer your question m8;

    'quote'

    Stretching DVD Capacity

    The developers also wanted to support other languages on the same disc, so that they wouldn't have to create different versions for different markets. Therefore, they included space for additional soundtracks, plus subtitles. Put it all together, and you need to store 4,692 Kbits per second for every second of a 135-minute movie. Do the math, and you come up with 4.75 billion bytes, which the industry rounds off to 4.75 GB. (They use 1,000,000,000 bytes per gigabyte, instead of 1,024 times 1,024 times 1,024, or 1,073,741,824 bytes per gigabyte.) Conveniently, they decided to create a disc with 4.75 GB capacity.



    'blah blah blah '



    While 4.7 GB may seem like an enormous capacity, the DVD specification already provides for even greater capacities. Instead of gluing a blank on top of the data-carrying DVD disk, you can use another data disc instead to create a double-sided disc that can store up to 9.4 GB. Many DVD movies have already taken advantage of this feature to put one version of a film formatted for a normal 4:3 aspect ratio television or computer monitor, and then on the other side, another widescreen version formatted for a 16:9 aspect ratio display.

    You can still get more storage on a single DVD disc. It is possible to create a middle data layer that has a translucent layer behind it, so that this layer is between the top data layer with its reflective coating and the clear bottom of the disc. The read laser focus gets adjusted so that it reads one layer or the other. You don't get twice the data per side--the second layer cannot be quite as dense as the single layer can be, but you can still use this approach to get 8.5 GB on a single-sided, dual-layer disc. Use this approach on both sides of a double-sided disc for up to 17 GB of data on one disc.

    'hope this helps'

    ::smug git::
  3. Bones

    Bones New Member

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    I heard that there were 3 competing formats for DVD technology, is this the one that "won" out over the others?
  4. MartindZ

    MartindZ New Member

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    The DVD+R and DVD+RW are "winning", disks are more expensive than DVD-R though.

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