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Exact Partition Creation (to the Mb)

micromega Posted messages 141 Status Member -  
epango Posted messages 37195 Registration date   Status Member Last intervention   -
Hello,

I'm looking to create an exact partition of 100GB (for example).
When I use partition software and set it to 100GB, I end up with a partition of 99.9GB as reported by Windows. To achieve exactly 100GB displayed, I have to go through several attempts that allow me to reach the desired value (either 100GB just after 99.9GB or 100GB just before 101GB).

Is there a method to succeed on the first try without any trial and error?

What factors are taken into account? Partition type, cluster sizes...?

Thank you.

2 answers

  1.
    darkleopard Posted messages 7926 Registration date   Status Contributor Last intervention   1 184
     
    hello.

    It depends on the software you are using.
    And it depends on the unit Go or Gio or GB
    Under Windows my Data partition is 384 Go and under Linux it is 413 GB.

    Simply because GB are the real values, my HDD is 750 GB, Linux gives me this value.
    Windows gives me a value of 699 Go.
    The same goes for my 240 GB SSDs, which show 225 Go under Windows.

    So your software may be using a different measure than the Go of Windows..
    And it seems that most use GB indeed, which remains the true raw capacity value of the hard drive...

    --
    Gaming is not a crime.
    Toshiba P870 - Quadruple Boot - i7 3630qm - 8 Go Dual Channel - Nvidia GT 630M 4 Go
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    1. micromega Posted messages 141 Status Member 1
       
      Hello and thank you for the information.

      I understand about the different types of units.
      I'm using MiniTools Partition Wizard which uses GB (Windows uses Go!). Is there a software that directly converts to Go?

      Thanks again.
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      1. darkleopard Posted messages 7926 Registration date   Status Contributor Last intervention   1 184 > micromega Posted messages 141 Status Member
         
        Hello.

        You can't convert because in any case your problem will remain the same..

        The simplest thing is if you want to try to use a round number, like 100 GB under Windows, look on the internet, there are simple converters available.

        You enter your value of 100 GB and see how much that is exactly in GB.

        And you'll get your round number.
        And if the value to enter in some software is in MB, you multiply by 1024.

        1024 MB = 1 GB.

        But this whole story about GB and Gb is quite hilarious, only Windows uses GB.

        For example, when you connect your 2000 Gb external HDD, Windows shows it as more than 1800 GB..

        You can easily get lost.
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      2. epango Posted messages 37195 Registration date   Status Member Last intervention   4 270 > darkleopard Posted messages 7926 Registration date   Status Contributor Last intervention  
         
        "You enter your value of 100 GB and you see exactly how much that is in GB."

        The Go is the French equivalent of GB (gigabyte). It should not be confused with Gb, which means gigabit. There is no reason that 100GB should be different from 100Go. Look at the external hard drives from certain brands (Toshiba, WD, etc.) that give the capacity in bytes and bytes, and you'll see the same number indicated (500GB, 500Go or 1TB, 1To). The difference comes from the fact that the capacity of the hard drives is given in decimal, while the computer sees it in binary. The fact that it can't put exactly 100Go, but rather 99.9Go! or 101Go is simply a matter of the precision of the tool it is using.
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  2. micromega
     
    Ok, I converted 100GB to MB online and I get 819200MB... indeed it's easy to get lost, with my different tests I don't get the same value in MB and yet I had the correct value in GB displayed on Windows.

    In any case, this problem is not related to the formatting type (NTFS, Fat32...) or the cluster size?
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