Clean install UEFI only 3 partitions

  1. Posts : 13
    win 10

    Clean install UEFI only 3 partitions

    hi all I have clean installed windows 10 in UEFI mode it showed 4 partitions but after install only shows 3 partitions in disc managment no MSR reserved partition why How do I know it is UEFI mode
      My Computer

  2. Posts : 4,457
    Win 11 Pro 22000.708

    In my system, disc management shows 3 partitions. The second one is a 100 MB EFI one.

    The diskpart utility shows a fourth one that is hidden from Disk Management.

    I'm pretty sure that I have a UEFI install.
      My Computers

  3. Posts : 201
    Kernel 4.x.x

    To know if you are installed naps UEFI or Legacy mode, simply look at the disk info for the disk which Windows is installed onto.

    In the Disk Management utility, right click on the system disk (Disk 0) and open properties. Check "Partition Style" under the "Volumes" tab.

    GPT means UEFI mode, no exceptions.
    MBR means Legacy mode, no exceptions.

    If installed as UEFI (you likely are) you should look into trying to disable the Compatibility Support Module (CSM) also known as legacy/bios emulation, if your BIOS supports disabling it. This will speed up the boot process substantially.

    If installed in Legacy mode, I suggest you reinstall in UEFI mode.
      My Computers

  4. Posts : 13
    win 10
    Thread Starter

    thanks for speedy replies kernel your advice showed gpt uefi thanks:)
      My Computer


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