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Question About Fitting XGD3 onto Dual Layer DVDs

Discussion in 'Xbox 360 - Modding & Hacking' started by eebeejay, Oct 1, 2011.

  1. eebeejay

    eebeejay Regular member

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    It never occurred to me before to find out the actual size of a DVD+R DL but now I'm wondering about it.

    The Gears 3 ISO is 8.13 GB.
    The DVD+R DL disc is 8.5 GB.
    This leaves .37GB of space.

    Shouldn't the XGD3 ISOs fit right on with no problem? Apparently they don't (which I already know). ?I'm wondering why they won't, when there is supposedly 370MB left over.

    Are the dual layers truly 8.5GB or are they less than advertised?
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  3. Modking30

    Modking30 Regular member

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    They are less. Kind of like an 80gb hard drive is like 74GB actual space. I think 8.5 comes out to like 8.15 or something similar.
  4. eebeejay

    eebeejay Regular member

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    I figured it was something like that. I'm gonna check out a Verb and a Memorex when I get home Monday.
  5. coorva

    coorva Regular member

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    dont say memorex around modking,,,
  6. cooll903

    cooll903 Regular member

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    memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex memorex. i have out of over 200 memorex have had only three bad ones
  7. eebeejay

    eebeejay Regular member

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    Here we go again...........
  8. funksoulb

    funksoulb Regular member

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    The reason this doesn't work is because you're comparing GB (the size of the disc) with GiB (the size of the Gears ISO). You're using 2 different scales.

    Disc manufacturers use GB as a measurement of storage, which is 1,000,000,000 bytes. Computer systems use base 2 though, so a GiB is 2 ^ 30 bytes, which is actually 1,073,741,824 bytes.

    Therefore if you take a DVD+R DL disc, the capacity in bytes is 8,547,991,552.

    8,547,991,552 / 1,000,000,000 = 8.548 GB (or thereabouts), so when most people say that a DVD+R DL is "8.5 GB" it's this figure they're talking about.

    But in terms of computer systems, the capacity is this: -

    8,547,991,552 / 1,073,741,824 = 7.961 GiB.

    So using GB as the scale: -

    Gears 3 = 8.739 GB
    DVD+R DL = 8.548 GB

    Or using GiB as the scale: -

    Gears 3 = 8.139 GiB
    DVD+R DL = 7.961 GiB
  9. eebeejay

    eebeejay Regular member

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    Understood.
    Either way, same result. ISO Larger than disc.
  10. cooll903

    cooll903 Regular member

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    thanks, that makes a lot of sense now

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