Windows 10: Multiple instance of Windows boot manager in UEFI

Discus and support Multiple instance of Windows boot manager in UEFI in Windows 10 Support to solve the problem; Hi guys, im quite sure this might be a fairly simple one, but a little scared to change whats active and whats not My system is win 10 pro with GPT... Discussion in 'Windows 10 Support' started by horze, Jan 5, 2021.

  1. horze Win User

    Multiple instance of Windows boot manager in UEFI


    Hi guys, im quite sure this might be a fairly simple one, but a little scared to change whats active and whats not

    My system is win 10 pro with GPT drives and only 1 OS.

    In my UEFI i have 2 windows boot manager pointing to the same phsyical hard drive. Wondering if its possible to remove it, i believe it might something set wrong with my active drives?

    Please see attached image of drive config
    Please note M and G partitions are both just storage partitions with no OS on them.
    Thankyou in advance


    Multiple instance of Windows boot manager in UEFI [​IMG]

    :)
     
    horze, Jan 5, 2021
    #1
  2. Kupuna Win User

    Many Confusing Instances of Windows Boot Manager.

    My PC is performing normally, but when I look at the bios boot page, I am very confused.

    Multiple instance of Windows boot manager in UEFI [​IMG]

    My bios Boot section shows multiple instances of Windows Boot Manager. The actual hardware is two SSD's one older data hard drive, a CD drive and a desktop backup hard drive. The Boot SSD is labeled P3 in the photo. The second SSD (P2) is just showing in the bottom listing and in the third listing up from the bottom. The DVD is P5. The data hard drive is called out by its amount used (476694... )in three locations, and the backup desktop drive (Seagate) in 2 entries. I understand that each of these entries drops down to allow making a different sequence of boot activities, but why so many?

    Why do I have this crazy quilt of "options" in my bios boot section? Why are they in this particular sequence? Why are some repeated? Why does the Seagate have listings with and without "UEFI (NTFS)? Why do some listings show the words "Windows Boot Manager" and others do not? And, to complete my display of ignorance: I figure that the Boot Manager manages the boot*Huh, but do I need these multiple listings? I can see booting from a DVD, but the other drives are not bootable.
    Thanks for trying to set me on the road to understanding.
     
    Kupuna, Jan 5, 2021
    #2
  3. topgundcp Win User
    Multiple Boot Managers and/or active partitions error

    I don't know what you did to fix previously but with the commands above should rebuild the the partition unless the partition itself is corrupted preventing you to run those commands.
    Let's try another way:

    1. Download the Macrium Rescue disk: MacRescue.iso - Google Drive
    2. Using a USB stick to create a bootable USB with: Rufus - Create bootable USB drives the easy way
    3. Boot up the PC with UEFI Mode and follow the screen shots to rebuild the EFI System partition.
      NOTE: The title must show: ..... Win PE 10 [UEFI] for step 3 to work since your Windows installed with GPT disk.
    IMPORTANT: make sure you use the correct disk in step 2, in your case is disk 1


    Multiple instance of Windows boot manager in UEFI [​IMG]



    Multiple instance of Windows boot manager in UEFI [​IMG]
     
    topgundcp, Jan 5, 2021
    #3
  4. Multiple instance of Windows boot manager in UEFI

    Trouble installing windows 7 on RAID in UEFI

    As the title says, I'm trying to install Windows on a RAID array in uefi on my Maximus V Formula. When using legacy ROM I can install just fine but I go into CSM and change settings to UEFI only, I can build the array in the UEFI Raid driver (IRST tab in "BIOS") but the array does not show up in the boot menu and when I try to install windows (boot from UEFI DVD drive), The drive does not show up in the Windows install. The next thing I tried was to enable UEFI and legacy oprom in CSM, boot from UEFI DVD drive and install to the RAID array (probably detected by legacy oprom) and it will install. After first reboot, Windows Boot manager will show up as an option in the BIOS boot menu so I set that as first boot device and reboot. I will get to the starting windows screen and then BSOD (too quick to get codes) The last thing I tried was Changing to legacy mode and installing windows to a different drive. once installed, I initialized the Raid array as GPT and rebooted, changed csm back to UEFI only but they RAID array still doesn't show in the boot device list so I repeated the earlier process hoping that It might work because I had initialized as GPT but it still BSODs on starting windows screen. Any help or suggestions would be greatly appreciated
     
    mystiksinner, Jan 5, 2021
    #4
Thema:

Multiple instance of Windows boot manager in UEFI

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