512gb usb memory stick only showing 460gb

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  1. cereberus's Avatar
    Posts : 12,884
    Windows10
       #11

    Yep as @steve108 says.

    Technically a gigabyte is 1000x1000x1000 bytes but for historic reasons Windows called a gigabyte 1024x1024x1024 bytes

    So the disk vendors are being a bit disengenuous taking advantage of this in marketing knowing they are strictly right and Windows is wrong (and they cannot be accused of false information)

    They rely on fact that most people do not understand this.
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  2. steve108's Avatar
    Posts : 19,284
    19041.1466 - 2004/20H1 Pro x64
       #12

    This graph from wikipedia.org visually shows the difference in decimal vs binary units:

    Binary prefix - Wikipedia

    See the table too:

    Binary prefix - Wikipedia
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  3. flavallee's Avatar
    Posts : 93
    Windows 7 Pro 64-bit / Windows 10 Pro 64-bit (dual boot)
       #13

    Most storage drives (HDD, SSD, USB) have an actual capacity of about 93% of what their marketing capacity is.
    That can vary (+ or -) by a small fraction, depending on the brand name and type of storage drive.
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  4. SIW2's Avatar
    Posts : 2,513
    trying to install win10
       #14

    I have just looked at a nominally 64gb sandisk usb stick. It shows as 57.84gb in windows, which is less than the 59.6gb the suggested conversion states.
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  5. AddRAM's Avatar
    Posts : 4,488
    Windows 10 Pro
       #15

    Cerawy said:
    Also, my ssd is a 512gb ssd, but it still shows a capacity of 476gb.
    Totally normal, what don`t you understand ?
    Did you read this entire thread ? It was explained.
    For example, look at a 1TB drive, it will say it has 1000GB right on the label. But a 1TB drive is only 931GB in windows.
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  6. Cerawy's Avatar
    Posts : 922
    Windows 10 Home 64 bit
    Thread Starter
       #16

    Gurn Blanston said:
    The missing 16 GB may be explained by Sandisk security and password software, if so equipped. My Sandisk USB stick lost a little bit of space due to these files.
    Yes, i was thinking something similar might be the reason for the missing 16gb. Is there someway to get rid of it, so it can be brought back to 476gb, the same amount as my ssd?
    Last edited by Cerawy; 03 Dec 2021 at 09:47.
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  7. Posts : 381
    Windows 10
       #17

    Cerawy said:
    Yes, i was thinking something similar might be the reason for the missing 16gb. Is there someway to get rid of it, so that it can be brought back to 476gb, the same amount as my ssd?
    I'm not sure about your USB stick, but mine has the security files on a non-modifiable partition. It seems to be write protected and I don't know how to undo that. 16 GB isn't much when you are dealing with 460 GB left over...
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  8. Cerawy's Avatar
    Posts : 922
    Windows 10 Home 64 bit
    Thread Starter
       #18

    I just checked in disk management. It only seems to have one partition. I also tried to check view hidden files and folders in windows, but i don't see any folders besides the one's that im using.
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  9. Ghot's Avatar
    Posts : 15,900
    Win 10 Home 10.0.19044.1469 (x64) [21H2]
       #19

    Cerawy said:
    I just checked in disk management. It only seems to have one partition. I also tried to check view hidden files and folders in windows, but i don't see any folders besides the one's that im using.


    You may have to look at it in a program like Minitools Partition Wizard (free).
    Sandisk has been adding stupid (IMO) software on USB sticks as long as I can remember.

    If you look up the "exact" make and model, and read the fine print... you will probably see this mentioned.
    I just looked at 512GB Sandisk Flash drive at Best Buy... it has some... encryption software.



    One of the reasons I always buy Corsair and PNY sticks, is that they don't "add stuff" to the USB stick.

    I do have one Sandisk USB stick (16GB), which had some software on it. I think all I did was right click it, in File Explorer and choose: FAT32 - quick format... and it removed the software.
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  10. Try3's Avatar
    Posts : 10,082
    Windows 10 Home x64 Version 21H2 Build 19044.1466
       #20

    Cerawy,

    I think none of us know the full story. The 1000/1024 units conversion is not the whole story; it does not explain what you are seeing and it does not explain what I see on all my USB sticks.
    - For example, my SanDisk "400GB" MicroSD cards both report 366GB in Windows [with no contents, with or without reformatting]. The 1000/1024 units conversion story, on its own, would indicate that I'd see 373GB.

    In the UK, we no longer have a Chat facility with SanDisk but you do [judging by your timezone].
    Chat with a member of our support team(For US residents ONLY)
    SanDisk Live Chat
    Monday - Friday: 08:00 AM - 06:45 PM PST
    Perhaps you could ask them what is going on beyond the 1000/1024 units conversion story [and some minor? loss for the hidden file system data].

    I've just submitted a question to SanDisk by email instead:-
    Try3 said:
    My "400GB" MicroSD card [‎SDSQUA4-400G-GN6MA] shows in Windows 10 as 366GB.
    I know about the GiB/GB conversion but that would indicate that my card would be reported by Windows as 375GB.
    What accounts for the difference?


    Do post back with whatever you learn from them and I'll do the same.

    All the best,
    Denis
    Last edited by Try3; 01 Dec 2021 at 06:01.
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