How to fix BCD for Dual Boot System

fireberd · 03 Dec 2019

My bootloader is corrupted (I think the last Insider upgrade did it). I have the correct two Win 10 installations listed (my Win 10 production system and the Win 10 Insider) but there are others listed, such as "UEFI IP4" and both of my DVD drives (see screenshot). I would like to clear out the invalids but don't know how. I have EasyBCD and tried to recreate the bootloader but it corrupted it (and I recovered with Macrium Reflect).

Here is the screenshot:

How to fix BCD for Dual Boot System-boot-bcd.jpg

x509 · 03 Dec 2019

I had a similar problem and I sort of "discovered" a workaround borne out of desperation. Either the bootloader or the BCD Store got corrupted, and I could not boot my system. I used MiniTool Partition Wizard to shrink the existing Windows partitions and a data partition, then did a fresh install of Win 10. And shazam!

suddenly the BCD store got rebuilt and when I installed EasyBCD I was able to see all three Windows partitions. So I deleted the fresh install, which I no longer needed, and cleaned up the EasyBCD entries for the existing Windows partitions.

fireberd · 03 Dec 2019

Thanks but there has to be a way other than a Win 10 install.

Kyhi · 03 Dec 2019

Is this a EFI or legacy system ? I assume uefi....

from within your booted OS -
use diskpart and assign a drive letter to the EFI (System) partition
Format the Partition
use diskpart to remove the drive letter

from command prompt(admin) type
bcdboot c:\windows
use the same command above - but change the drive letter to match your off-line OS
Then use EasyBCD to edit the OS Description

NavyLCDR · 03 Dec 2019

It's a long read, but if you start at post #29 here:
Element not found for each fixboot and rebuild bcd, RAW recovery

you can read the trail of how I guided another member to safely create a new EFI System Partition.

SIW2 · 04 Dec 2019

.

I would like to clear out the invalids but don't know how

bcdedit /export c:\oldstore
bcdedit /createstore c:\emptystore
bcdedit /import c:\emptystore /clean
bcdboot c:\windows

topgundcp · 04 Dec 2019

bcdedit /export c:\oldstore
bcdedit /createstore c:\emptystore
bcdedit /import c:\emptystore /clean
bcdboot c:\windows

Yep. For dual boot, you also need:
bcdboot e:\Windows

NavyLCDR · 04 Dec 2019

Well, that is a heck of a lot easier!

fireberd · 04 Dec 2019

Those commands did it. Thanks.

PB11 · 10 Mar 2021

hello all.
So pumped to have found this thread.
I'm hoping i can just jump in and vomit info regarding my situation.

I have a workstation that multi boots, I need and have taken a clone backup onto an identical SSD, but the backup wouldn't boot.
I have gone through and recreated the bootloader but now it only recognizes the OS it had last booted into. All partitions are still there, I'm guessing the boot manager just doesn't have the other os's registered.

Is there someway I can retroactively have these re-registered with the boot manager?

any directions would be greatly appreciated.