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Solved WD HDD Capacity Question ???

Discussion in 'Hardware' started by BearKiller, Jul 24, 2017.

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  1. BearKiller

    BearKiller Thread Starter

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    Why do my shiny new WD Blue 2TB HDDs in external enclosures only show up as having 1863 GB; that is 137 GB less than I expected ? (Windows 7 if that has any relevance)

    Thanks for reading.
     
  2. crjdriver

    crjdriver Moderator

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    It is normal. The drive mfg counts size one way and the operating system counts it another way [binary]
    It is fine.
     
  3. BearKiller

    BearKiller Thread Starter

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    Thanks so much; I was afraid I may have done something wrong.

    However, it is sort of a let down that they advertise a certain capacity when in reality what you get is considerably less --- oh well.......
     
  4. flavallee

    flavallee Trusted Advisor

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    That's normal.
    You have to multiply the marketing capacity by .931 to get its true capacity.

    Your new SATA hard drive has a marketing capacity of 2 TB(2000 GB)
    2000 GB
    X .931 = 1862 GB

    Another example is why these SATA hard drives have these true capacities:
    1 TB(1000 GB) > 931 GB
    750 GB > 698 GB
    500 GB > 465 GB

    ---------------------------------------------------------------
     
    Last edited: Jul 24, 2017
  5. BearKiller

    BearKiller Thread Starter

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    Thanks for the math; I was unaware of that formula; I will record that info somewhere where I can't find it the next time I need it.

    It would appear that buying HDDs is akin to buying cattle across a crooked set of scales; you don't actually get what you pay for.
     
  6. crjdriver

    crjdriver Moderator

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    You get what you pay for. You purchased a 2TB drive and the operating system uses a different method of calculating size ie binary vs base10.
     
  7. BearKiller

    BearKiller Thread Starter

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    Back fifty or so years ago, I was a whiz at math and I seem to remember the word binary, but I don't think the teacher knew enough about it so she just sort of skipped over it.

    This discussion has gotten my curiosity stirred up and I may read up on this binary and base10 business.

    I appreciate you guys explaining this to me; when I first saw that 137 GB discrepancy, I was afraid that I had messed up.
     
  8. crjdriver

    crjdriver Moderator

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    No, you did not mess up. There was even a class action lawsuit a number of years ago regarding just this issue. It has been a LONG time however as I recall, the drive mfgs had to pay some small amount to each person that signed up to be part of the class action.
     
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