700 MB Disc Reads as 670MB

Discussion in 'General Mac Discussion' started by OrangeJTM46, Oct 15, 2004.

  1. OrangeJTM46 macrumors newbie

    Joined:
    Oct 15, 2004
    Location:
    Philadelphia, PA
    #1
    Hi

    I'm trying to backup some files on to cd, but when I put my 700MB CDR in, it says its actual capacity is only 670MB. Why is this and how can I get the full 700MB? Thanks.

    Jon
     
  2. G5orbust macrumors 65816

    G5orbust

    Joined:
    Jun 14, 2002
    #3
    Thats called formatting... you have the same deal with hard drives or really any other optical media. A 60GB hard drive actually has about 56-57GB of usable space due to formatting.
     
  3. zv470 macrumors 6502

    Joined:
    Jul 4, 2004
    Location:
    New Zealand
    #4
    because 1 megabyte isn't a 1000 kilobytes

    1 megabyte = 1024 kilobytes

    so 700MB becomes 683MB of real storage
    (to get 683MB divide 700,000 by 1024)
     

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