USB thumb drives


  1. Posts : 9
    w7/w10
       #1

    USB thumb drives


    Sorry not really a w10 issue but how much actual data should I expect to get from a 32g drive? I just bought one and it is only 28.6 should I return it?

    I contacted Sandisk and this is what they said;

    Thank you for contacting SanDisk® Global Customer Support. I understand your concern. Please allow me to inform you that the capacity you get from your drive depends on the OS. All SanDisk® products include the total capacity, at an unformatted level, that is stated on the product packaging. For example, a 128GB SanDisk USB flash drive has a total capacity of 128,000,000,000 bytes at the unformatted level (where 1GB=1,000,000,000 bytes).

    A portion of the total capacity is used to store certain functions including optimizations of the memory that support performance and endurance and therefore is not available for user storage. This is disclosed on our packaging and marketing materials when you see the statement “Actual user storage less.”

    the difference in the definition of one Gigabyte by operating systems versus product manufacturers. Operating systems use a binary system which will present a lower number of GB than the decimal based system used by manufacturers to define the capacity of products. This is due to the binary system representing a GB as a higher number of actual bytes.

    For example: Operating systems define a 1GB as 1,073,741,824 Bytes. We define 1GB as 1,000,000,000 bytes.

    To understand this difference in definition better, you may refer to the following articles from our online Knowledge base:

    Capacity of the device (as reported by many operating systems)

    Please respond to this email if you need any further assistance. Thank you for choosing SanDisk® products.

    Best regards,
    Larry S.
    SanDisk® Global Customer Support
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  2. Try3's Avatar
    Posts : 7,452
    Windows 10 Home x64 Version 20H2 Build 19042.928
       #2

    No, don't return it. The result seems about right.

    It's not just converting between numbering systems - if you use a third-party utility such as Minitool partition manager you'll see that Windows is also setting up a [hidden] partition on it that takes some of the sapce [this partition is never shown by Windows' own Disk management utility].

    Their Knowledge base article probably completes their explanation suitably. You will be able to search online for fuller explanations if theirs is not good enough.

    You can also use your built-in Windows calculator to convert data units from one type to another -

    USB thumb drives-calculator-b-gugib-conversion.png

    And, purely out of interest, is this the link they gave you to their Knowledge base article?
    Capacity of the device (as reported by many operating systems) does not match its label - WD-SanDisk

    Denis
    Last edited by Try3; 05 Mar 2020 at 20:32.
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  3. Berton's Avatar
    Posts : 10,533
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #3

    Right, formatted drives and optical discs always lose some apparent space after the formatting and a lot is how manufacturers describe the space on their product.
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  4. pparks1's Avatar
    Posts : 1,695
    Windows 10 Pro
       #4

    That is the correct reading you will get from windows. It's the difference between gigabyte and gigabytes. All storage drives do this. It's been this way forever. The bigger thr device, the bigger the loss appears to be. 2TB only have 1.8x of space.
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  5. bobkn's Avatar
    Posts : 3,609
    Win 10 X64 Pro 21H1 19043.928
       #5

    pparks1 said:
    That is the correct reading you will get from windows. It's the difference between gigabyte and gigabytes. All storage drives do this. It's been this way forever. The bigger thr device, the bigger the loss appears to be. 2TB only have 1.8x of space.
    If the 28.6 GB number in the OP's post is correct, that's not the whole explanation. 32 GB decimal is 29.80 GB in Windows-ese. (As mentioned in post 2.)

    I just looked at a "16 GB" flash drive. Windows shows it having an actual 15.83 GB (decimal), which gives 14.7GB in Windows.
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  6. pparks1's Avatar
    Posts : 1,695
    Windows 10 Pro
       #6

    Right, its 29.8 with the binary math. Then you have to take into account the controller which reserves some space for proper functioning as the drive wears out. Its usually around 5-7%
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  7. Pejole2165's Avatar
    Posts : 747
    Windows 10 Pro 1909
       #7

    This is the thing with USB flash drive style disks, they are not considered SSDs but operate in exactly the same way, in order to write to a flash drive the area written to needs moving elsewhere, added to then moved back (horribly simplistic explanation), so flash drives have over provisioned space to allow them to function, same as SSDs, then you have the file system overhead as well, so user available space will always be a little less than advertised size.
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  8. Berton's Avatar
    Posts : 10,533
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #8

    One thing that used to be plain/easier to work with was bits and Bytes, described by the b versus B. It takes 8 bits to make 1 Byte. The distinction between the 2 words has blurred into B being used in both instances, sometimes makes it difficult to determine the correct description of things. Adding Kilo, Mega, Giga and Tera at the beginning of either b or B indicates the multiples in use.
      My Computers


  9. Posts : 9
    w7/w10
    Thread Starter
       #9

    Thanks guys I knew this was a great place to get a wealth of info I can understand. So +/- this is about right.

    Here's the thing I wanted this I wanted this drive to hold all 7 discs of my Roosevelt's collection and I'm about 1g short. To each his own but I use it to fall asleep. I may return or just get a different drive anyhow when it's done playing it has a blinking light that is bothersome under these circumstances.

    I may just go to Micro Center and look at different options. I need 29.4g exactly.
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  10. Pejole2165's Avatar
    Posts : 747
    Windows 10 Pro 1909
       #10

    I can suggest Kingston Data Traveller range, not the best write speed, but reliable, no flashy lights, well built, not overly expensive.
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