How to change SYSTEM drive letter to C from another letter

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  1. Posts : 2
    windows 10
       #1

    How to change SYSTEM drive letter to C from another letter


    I am working on a step by step process to fix the computer for windows 11 upgrade. (Currently have Windows 10)

    This was a built PC, but when my friend installed the OS for me somehow the windows install drive became the F drive.

    Here is a view of disk management

    I want to do the following (believe I need to do in this order).
    1. Move windows install drive letter from F to C
    2. Fix it so bootloader is MBR / on the SSD

    Afraid of just changing the letter in disk management as the system will look for system files in the f-drive. I do have AOMEI partition assistant installed if that is useful for this task.
    I really appreciate any help in how to do it.
    Attached Thumbnails Attached Thumbnails How to change SYSTEM drive letter to C from another letter-capture.jpg  
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  2. Posts : 2,208
    Windows 11 Pro 64-bit v23H2
       #2

    Technically it might be possible but it would take a really long time. It is better just to back up the data on the drive and reinstall Windows.
      My Computers


  3. Posts : 2
    windows 10
    Thread Starter
       #3

    MisterEd said:
    Technically it might be possible but it would take a really long time. It is better just to back up the data on the drive and reinstall Windows.
    Thank you - I have some unique software installed (with custom settings) that makes me hesitant to re-install it. The system has been working since 2020, so it is more about cleaning and fixing in case I want to upgrade.
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  4. NTN
    Posts : 969
    W10 19045.2546
       #4

    https://learn.microsoft.com/en-us/wi...a-drive-letter
    How to change SYSTEM drive letter from C to any other letter (A or Z)

    I've not did it myself, but good explained here.


    Also a free program that claim to fix:
    Part 3: How to Recover Lost Data after Changing Drive Letter?
    【Fixed 2022】4 Solutions on How to Change Drive Letter Windows 10 without Losing Data
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  5. Posts : 4,631
    several
       #5

    Move windows install drive letter from F to C
    It can be done during installation between apply and the setup phase. I have been choosing my own preferred os letters for years.

    There is one thing you could try :

    make a backup image first then

    1. use syprep to generalize the os

    2. set the osletter

    3. you will need to use bcdboot to reset the bcd store after generalising

    then because it has been genralised it should setup again when booted. But there could be consequences for programs that have been installed for the previous user which might involve a bit of fiddling around afterwards.
    Last edited by SIW2; 05 Jan 2023 at 09:12.
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  6. Posts : 4,631
    several
       #6

    Fix it so bootloader is MBR / on the SSD
    mark F as Active

    from admin cmd prompt type:

    bcdboot f:\windows /s f:

    detach the other disk and make sure it boots up.
      My Computer


  7. Posts : 4,631
    several
       #7

    SIW2 said:

    It can be done during installation between apply and the setup phase. I have been choosing my own preferred os letters for years.

    There is one thing you could try :

    make a backup image first then

    1. use syprep to generalize the os

    2. set the os letter

    3. you will need to use bcdboot to reset the bcd store after generalising

    then because it has been generalised it should setup again when booted. But there could be consequences for programs that have been installed for the previous user which might involve a bit of fiddling around afterwards.
    Yes, just tested, it works.

    generalise, set the os letter and boot back in.

    create a new user account at oobe , select to go into the old one at logon screen and then delete the new user.

    bcdbootdiskv14x64.zip

    current os letter F

    How to change SYSTEM drive letter to C from another letter-syspreptest1.jpg

    generalise

    How to change SYSTEM drive letter to C from another letter-2023-01-04_125617.jpg

    boot into a different os ( or winpe ) to fix bcd and set the os letter

    How to change SYSTEM drive letter to C from another letter-syspreptest4.jpg

    reset bcd entry

    How to change SYSTEM drive letter to C from another letter-syspreptest5.jpg

    How to change SYSTEM drive letter to C from another letter-syspreptest6.jpg


    set os letter

    How to change SYSTEM drive letter to C from another letter-syspreptest7.jpg

    How to change SYSTEM drive letter to C from another letter-syspreptest8.jpg

    How to change SYSTEM drive letter to C from another letter-syspreptest9.jpg


    boot into it, create a new user account at oobe , select to go into the old user at logon screen and then delete the new user.



    new os letter C

    How to change SYSTEM drive letter to C from another letter-syspreptest10.jpg
    Last edited by SIW2; 04 Jan 2023 at 18:08.
      My Computer


  8. Posts : 6,393
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #8

    Windows assign letter C: to the Windows partition it booted from.
    - If you boot from Windows on partition 1, drive 1, Windows on partition 1 will be assigned a letter C:, drive 0 partition 1 can be any letter.
    - If you boot from Windows on partition 1, drive 0, Windows on partition 1 will be assigned a letter C:, drive 1 partition 1 can be any letter.

    On the disk image on post 1 it seems you booted from Windows on partition 1, drive 1


    If Windows was also installed on partition 1, drive 0, (the SSD I suppose) all you have to do is:
    - Open a CMD window as administrator and type:
    diskpart
    select volume f
    active
    exit
    bcdboot F:\Windows /s F: /f BIOS
    exit

    - Select disk 0 as first boot option on BIOS. You will boot from drive 0 and F: will become C:
    The Windows partition on drive 1 will have another letter than C:.
    You will have to fix the Recovery environment (it is now on drive 1)
      My Computers


  9. Posts : 41,534
    windows 10 professional version 1607 build 14393.969 64 bit
       #9

    Please run:
    https://aka.ms/GetPCHealthCheckApp

    Post a share link into this thread using one drive, drop box, or google drive.

    With the plans to upgrade from Windows 10 to Windows 11 the upgrade can be performed in a supported or unsupported fashion.

    If the plan is to make a supported upgrade then the BIOS needs to be UEFI and the drive partition GPT.

    Consider the following approach:

    Make a free backup image using Macrium.

    Clean install Windows 11 on the applicable disk drive.
    (It will have the four default partitions with the optimal partition architecture: Reserved/System/Data/Recovery)

    Use Macrium to restore only the Data partition.

    This may allow multiple issues to be fixed.


    https://learn.microsoft.com/en-us/wi...iew=windows-11

    https://learn.microsoft.com/en-us/wi...iew=windows-11
      My Computer


  10. Posts : 4,631
    several
       #10

    Megahertz said:
    Windows assign letter C: to the Windows partition it booted from.
    - If you boot from Windows on partition 1, drive 1, Windows on partition 1 will be assigned a letter C:, drive 0 partition 1 can be any letter.
    - If you boot from Windows on partition 1, drive 0, Windows on partition 1 will be assigned a letter C:, drive 1 partition 1 can be any letter.

    On the disk image on post 1 it seems you booted from Windows on partition 1, drive 1


    If Windows was also installed on partition 1, drive 0, (the SSD I suppose) all you have to do is:
    - Open a CMD window as administrator and type:
    diskpart
    select volume f
    active
    exit
    bcdboot F:\Windows /s F: /f BIOS
    exit

    - Select disk 0 as first boot option on BIOS. You will boot from drive 0 and F: will become C:
    The Windows partition on drive 1 will have another letter than C:.
    You will have to fix the Recovery environment (it is now on drive 1)
    @Megahertz

    How to change SYSTEM drive letter to C from another letter-osltter-f.jpg

    the os letter is F.

    I am not sure why the op thinks he needs to change it.

    I have just shown that it can be done if he really wants.
      My Computer


 

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