Windows 10: diskpart - detail partition Active flag missing

Discus and support diskpart - detail partition Active flag missing in Windows 10 Drivers and Hardware to solve the problem; So I had the need today to find what partition on a system disk was marked as Active. The installed Windows version is Windows 10 Pro 20H2 build... Discussion in 'Windows 10 Drivers and Hardware' started by Railtech, May 4, 2021.

  1. RAILTECH
    Railtech Win User

    diskpart - detail partition Active flag missing


    So I had the need today to find what partition on a system disk was marked as Active. The installed Windows version is Windows 10 Pro 20H2 build 19042.867. I proceeded as I normally do opening an admin command prompt and running diskpart commands: list diskselect disklist partitiondetail partition In the past detail partition would display the Active flag as either Yes or NO. Now nothing, does anyone know what happened to this flag? Without it there is no way to know what partition on disk is active, is this an oversight by MS?

    :)
     
    Railtech, May 4, 2021
    #1
  2. RAILTECH
    Railtech Win User

    diskpart - detail partition Active flag missing

    So I had the need today to find what partition on a system disk was marked as Active. The installed Windows version is Windows 10 Pro 20H2 build 19042.867. I proceeded as I normally do opening an admin command prompt and running diskpart commands:


    • list disk
    • select disk
    • list partition
    • detail partition

    In the past detail partition would display the Active flag as either Yes or NO. Now nothing, does anyone know what happened to this flag? Without it there is no way to know what partition on disk is active, is this an oversight by MS?


    diskpart - detail partition Active flag missing [​IMG]
     
    Railtech, May 5, 2021
    #2
  3. TOPGUNDCP
    topgundcp Win User
    diskpart - detail partition Active flag missing

    I think your disk is a GPT disk. There's no such thing as Active Flag. It's only applied to MBR disk.
    Your 1st partition is MSR reserved partition, the 100MB(partition 2) is the EFI System partition.
     
    topgundcp, May 5, 2021
    #3
  4. BREE
    Bree Win User

    diskpart - detail partition Active flag missing

    diskpart - detail partition Active flag missing

    No, its not an oversight. It is because the disk you are looking at is a GPT formated disk. There is no such thing as an 'active' partition for a GPT disk, that concept only exists for a Legacy bios/MBR system. A UEFI system always boots from the EFI partition.

    And your partition 2 can be identified as an EFI partition on a GPT drive for two reasons, the first is that the 'Type' is given as a GUID string (on an MBR drive it is a two digit hex number) and the second is that it is 100MB, formatted as Fat32, which is typical for an EFI partition.

    GUID Partition Table - Wikipedia
     
    Bree, May 5, 2021
    #4
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