BCD Corrupted? Cannot boot Windows 10

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  1. Posts : 36
    Windows 10 64-bit
       #1

    BCD Corrupted? Cannot boot Windows 10


    Hello all, my computer had a BSOD and upon rebooting, it doesn't boot into Windows 10 anymore. It reboot loops when trying to load Windows (circle with dots). I've entered recovery and tried to use the following commands in Command Prompt:
    bootrec /fixmbr --> Ok
    bootrec /fixboot --> Ok
    bootrec /rebuildbcd --> Total identified Windows installations: 1, The requested system device cannot be identified due to multiple indistiguishable devices potentially matching the identification criteria.


    To solve the rebuildbcd problem, I've tried the instructions below but again to no avail:
    https://superuser.com/questions/725322/issue-with-a-windows-7-boot-issue-involving-the-bcd-perhaps
    Can someone help me get my computer running again? I've tried multiple recovery tools but none of them has fixed the issue.
    Running bcdedit /enum gives the following:
    The boot configuration data store could not be opened.
    The requested system device cannot be identified due to multiple indistinguishable devices potentially matching the identification criteria.
      My Computer


  2. Posts : 18,432
    Windows 11 Pro
       #2

    As a start you would need to delete your System Reserved (legacy BIOS) or EFI System Partition (UEFI), recreate the partition, then put the proper boot files in it with the BCDBOOT command.
      My Computer


  3. Posts : 5,330
    Windows 11 Pro 64-bit
       #3
      My Computer


  4. Posts : 36
    Windows 10 64-bit
    Thread Starter
       #4

    NavyLCDR said:
    As a start you would need to delete your System Reserved (legacy BIOS) or EFI System Partition (UEFI), recreate the partition, then put the proper boot files in it with the BCDBOOT command.
    Is this the 128MB RAW-formatted partition or the 100MB FAT32-formatted partition?

    The link is not accessible to me. It says it's either removed or I don't have the privileges to see it.
      My Computer


  5. Posts : 18,432
    Windows 11 Pro
       #5

    The 100MB FAT32 partition will be the EFI System Partition the computer boots from. That is the one that needs to be recreated.

    The 128MB RAW partition is the Microsoft Reserved partition and should be just left alone.
      My Computer


  6. Posts : 36
    Windows 10 64-bit
    Thread Starter
       #6

    Thank you for clarifying that. And how do I go about deleting this partition and recreating it using the command line?

    Edit: I went ahead and formatted the partition, assigned it as S: and used bcdboot C:\Windows /s S: and now it's saying Total identified Windows installations: 0
      My Computer


  7. Posts : 18,432
    Windows 11 Pro
       #7

    Are you sure your Windows partition was assigned drive letter C: in the command line environment?

    The proper way to completely recreate the EFI System Partition Partition would be:

    Code:
    diskpart
    lis vol  <- note which drive letter your Windows partition is assigned
    lis dis <- note the disk number of the drive containing your EFI system partition
    sel dis # <- replace # with the drive identified above
    lis par <- note which partition is the EFI System partition
    sel par # <- replace # with the partition number identified above
    del par override
    cre par EFI
    for fs=FAT32 quick
    assign letter=s
    exit
    bcdboot C:\Windows /s S: /f UEFI <- note may need to change C: to the drive letter identified above
    exit
    It is starting to sound, though, more and more like your Windows installation is corrupted.
      My Computer


  8. Posts : 36
    Windows 10 64-bit
    Thread Starter
       #8

    Yes, I'm quite sure.

    Edit: Tried your steps above again, and at assign letter=s, it says The specified drive letter is not free to be assigned.

    Edit 2: Rebooted and did all the steps successfully, but /fixmbr and /fixboot both say cannot find the file specified, and the same 0 Windows installations for /rebuildbcd. It was 1 before 😐

    - - - Updated - - -

    Another reboot, another mystery. /fixmbr and /fixboot now works, /rebuildbcd shows 1 installation, and saying yes to add to boot list brings us back to the indistinguishable error. Is this because both my 128MB and 100MB partitions are listed as System rather than Reserved and System? There's no recovery partition it seems.
    Last edited by nfshp253; 14 Mar 2020 at 13:05.
      My Computer


  9. Posts : 18,432
    Windows 11 Pro
       #9

    I think it is because your Windows installation is corrupt.
      My Computer


  10. Posts : 36
    Windows 10 64-bit
    Thread Starter
       #10

    That's disappointing to hear. I did run an sfc /scannow and chkdsk and all were fine.
      My Computer


 

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