How can I merge system and boot partitions

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  1. Posts : 9
    Windows
       #1

    How can I merge system and boot partitions


    Hi to all!
    On hdd-1 I have clean installation of windows 10 Pro updated to the latest version. (Of course) there are system reserved active partition followed by boot partition C. Tell me, please, how to (if possible) merge system and boot partitions without the need for subsequent reinstallation of Windows 10.
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  2. thomaseg1's Avatar
    Posts : 13,332
    Windows 10 Pro (x64) 20H2 19042.804 & 21327.1000
       #2

    Not certain it is possible .
    The Boot partition is separate from the system on purpose.
    I'm not certain you'll be able to boot with them merged.
    Why do you wish to? (just curious)
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  3. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #3

    Run from Command Prompt (Admin):
    bcdboot C:\Windows /s C: /f BIOS

    Then make sure the C: drive is marked as active. Then reboot the computer. Check that C: drive gets flagged as the system partition. Once it is flagged as the system partition, then you can delete the system reserved partition and expand C: drive into the empty space.
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  4. Posts : 358
    Windows 10
       #4

    To really "merge" the two partitions, see
    How to Remove the Windows "System Reserved" Partition
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  5. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #5

    Wow. Post #3 is sure a lot easier....
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  6. Kyhi's Avatar
    Posts : 3,553
    Windows 3.1 to Windows 10
       #6

    NavyLCDR said:
    Run from Command Prompt (Admin):
    bcdboot C:\Windows /s C: /f BIOS

    Then make sure the C: drive is marked as active. Then reboot the computer. Check that C: drive gets flagged as the system partition. Once it is flagged as the system partition, then you can delete the system reserved partition and expand C: drive into the empty space.


    If this was a Clean Installation - the system partition may contain WinRE (Depending on size of Partition - as not stated)
    I would run > reagentc /disable
    to move winre back into system32 folder before removing system partition...

    But honestly I would leave the System partition as it is..................
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  7. Steve C's Avatar
    Posts : 6,295
    Windows 10 Pro 64 bit
       #7

    NavyLCDR said:
    Run from Command Prompt (Admin):
    bcdboot C:\Windows /s C: /f BIOS

    Then make sure the C: drive is marked as active. Then reboot the computer. Check that C: drive gets flagged as the system partition. Once it is flagged as the system partition, then you can delete the system reserved partition and expand C: drive into the empty space.
    Is this action wise to avoid future upgrade problems?
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  8. ddelo's Avatar
    Posts : 2,231
    Windows 10 Pro x64
       #8

    I just got a new hp ProBook laptop.
    As usually I need to clean install W10 to get rid of all the hp bloatware, but I noticed that the EFI System partition, is not the usual 100MB, but 260 MB. Checking its contents with minitool I saw that there are hp data in there, saved when I upgraded the laptop BIOS + the hp UEFI diagnostics, used when you press F2 at boot time.
    For clean installs I have made a diskpart script, with which I create the 4 UEFI required partitions:
    1. EFI (100MB)
    2. MSR (16MB)
    3. Windows (Rest of the disk - 950MB)
    4. WindowsRE (950MB)

    May I ask your opinion if I should keep this 260MB EFI and delete and recreate at installation time (Shift+F10) the remaining 3 partitions, or run my usual script and clean the disk and create the usual partitions?
    In the latter case, I will need to create a USB stick to be used for BIOS upgrades and UEFI diagnostics.

    Thanks a lot, guys.

    @Steve C
    I finally got it! Now the hassle begins
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  9. Steve C's Avatar
    Posts : 6,295
    Windows 10 Pro 64 bit
       #9

    ddelo said:
    I just got a new hp ProBook laptop.
    As usually I need to clean install W10 to get rid of all the hp bloatware, but I noticed that the EFI System partition, is not the usual 100MB, but 260 MB. Checking its contents with minitool I saw that there are hp data in there, saved when I upgraded the laptop BIOS + the hp UEFI diagnostics, used when you press F2 at boot time.
    For clean installs I have made a diskpart script, with which I create the 4 UEFI required partitions:
    1. EFI (100MB)
    2. MSR (16MB)
    3. Windows (Rest of the disk - 950MB)
    4. WindowsRE (950MB)

    May I ask your opinion if I should keep this 260MB EFI and delete and recreate at installation time (Shift+F10) the remaining 3 partitions, or run my usual script and clean the disk and create the usual partitions?
    In the latter case, I will need to create a USB stick to be used for BIOS upgrades and UEFI diagnostics.

    Thanks a lot, guys.
    I also bought a HP Probook a few months ago and note my EFI system partition is also 260MB. I guess I'll leave it be in order to keep the HP diagnostics.
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  10. ddelo's Avatar
    Posts : 2,231
    Windows 10 Pro x64
       #10

    Steve C said:
    I also bought a HP Probook a few months ago and note my EFI system partition is also 260MB. I guess I'll leave it be in order to keep the HP diagnostics.
    Thanks a lot Steve. That's what I was thinking, but i thought that an opinion from our fellow-more knowledgeable in the subject- members might help.
    Last edited by ddelo; 12 Feb 2020 at 07:44.
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