7.96GB limit on a DVD DL??

Discussion in 'Mac Apps and Mac App Store' started by iBeck, Oct 13, 2008.

  1. iBeck macrumors newbie

    Joined:
    Oct 13, 2008
    #1
    I'm trying to fit my 8GB project onto a DVD DL in Toast 9.02.

    The disc claims that it can hold 8,5GB of data, but Toast says 7.96GB is the limit.

    Why?? -and more important: am I doing something wrong?
    Help

    iBeck
     
  2. wrldwzrd89 macrumors G5

    wrldwzrd89

    Joined:
    Jun 6, 2003
    Location:
    Solon, OH
    #2
    This is completely normal. The disc is lying, because optical disc makers (along with hard drive makers) count bits differently than your computer does.

    According to the manufacturers, 1 kilobyte is 1000 bytes. According to your computer, 1 kilobyte is 1024 bytes. The same applies to all the other units - megabytes, gigabytes, terabytes, petabytes, etc.

    To account for this discrepancy, simply take the advertised size (8.5 GB, in this case) and convert it to bytes by multiplying by the manufacturer's conversion factor (1,000,000,000 or 1 billion) then divide by 1,073,741,824 (your computer's bytes to gigabytes conversion factor). This yields about 7.92 GB usable (the real number is a little less than 7.92 but I've rounded it for convenience).
     
  3. kgarner macrumors 68000

    kgarner

    Joined:
    Jan 28, 2004
    Location:
    Utah
    #3
    I don't know for sure, but I believe it might depend on the type of data you are storing. I.e. if you are just storing files you can get 8.5 GB but if you are creating a DVD (movie-type project) the header data and such may require more room and limit the amount of space available.
     
  4. iBeck thread starter macrumors newbie

    Joined:
    Oct 13, 2008
    #4
    damn

    Ok thx alot

    it seems that i have to rearrange my hole dvd-project then... not what i was hoping to do.

    but then again dvd studio pro says that everything is ok! but i can't burn DVD DL on that computer...

    thanks anyway
     

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