External hard drive missing gigs?

Discussion in 'Mac Accessories' started by Rusalka, May 25, 2009.

  1. Rusalka macrumors regular

    Rusalka

    Joined:
    Dec 8, 2008
    Location:
    Northern Virginia
    #1
    I recently bought my first hard drive, a Hitachi 640GB, I just plugged it in and it's telling me there's 595 GB of 595 GB available.

    Like I said, this is my first hard drive, can someone explain the reason why I'm missing 45 GB? Is it an operating system? Is there anyway to get rid of it?
     
  2. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #2
    Formatting.

    The capacity listed by the manufacturer, doesn't take this into account.
     
  3. mobilehaathi macrumors G3

    mobilehaathi

    Joined:
    Aug 19, 2008
    Location:
    The Anthropocene
    #3
    It is all there. It has to do with them advertising 640GB where as the OS is measuring in GiB.
     
  4. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #5
    Hard drive manufactures use the wrong conversion "rate" for measuring their HDDs for marketing purposes.

    In reality 1024 bytes are 1 kilobyte, but the HDD manufactures use 1000 bytes = 1 kilobyte.

    So you have approx. 640.000.000.000 bytes of HDD space on your new HDD, which is 640.000.000.000 / 1024 / 1024 / 1024 gigabyte.

    640.000.000.000 bytes = 596 gigabytes.
     
  5. Rusalka thread starter macrumors regular

    Rusalka

    Joined:
    Dec 8, 2008
    Location:
    Northern Virginia
    #6
    Thank you all very much for being so informative and helpful :)
     

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