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I have laptop with two HDD. Each HDD has its own Windows 10 installation. Bios mode is UEFI. I have change boot sequence in bios and start system from second disc. System has done some windows update, but next time I was trying boot my first hdd it failed and got into repair mode. How to get back my main system that in picture below is shown as volume D. Picture is taken while booted from second HDD.

enter image description here

UPD

I have removed my second drive and have booted in recovery mode. I got to command prompt and this is how my partitions look like:

enter image description here

UPD 2

I used DISKPART and assigned drive letter to system partition:

assign letter=s

then

bcdboot c:\Windows /s S: /f EFI

And not got blue screen with error:

Your device needs to be repaired:

\Windows\system32\driver\pdc.sys
error code 0x000000d
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1 Answer 1

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What you could try is to use diskpart to delete the corrupt EFI partition, create a new one and add the boot files for the new Partition with bcdboot

I suggest you unplug your 2nd drive before so you don't accidentally mess with the wrong partitions.

  1. Create USB Boot Stick (Windows Media creation tool) and boot from it
  2. press Shift + F10 (you might need to go through a few windows first)
  3. type diskpart -> list disk -> sel disk x (x being the number of your HDD in the list) -> list part .> sel part x (x being the number of your efi part) -> del part x -> create partition efi -> format quick fs=fat32
  4. type exit
  5. in the command prompt, type bcdboot C:\Windows. If it wants you to specify the target part, try assigning a letter to the EFI in diskpart and use the /s switch (https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/bcdboot-command-line-options-techref-di?view=windows-11)

Exit, shutdown, disconnect USB, boot up, see if it works.

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  • But if I perform del part x I will loose all my data
    – vico
    Commented May 6, 2022 at 6:25
  • Probably the del and (re)create is unnecessary. Just (re)format it should do.
    – Tom Yan
    Commented May 6, 2022 at 6:31
  • I have removed my second drive and have booted in recovery mode. More details in UPD in question body
    – vico
    Commented May 6, 2022 at 6:50
  • The partition with type System is the one you should rebuild.
    – Tom Yan
    Commented May 6, 2022 at 7:01
  • I strongly suggest that you run bcdboot with /f UEFI specified btw.
    – Tom Yan
    Commented May 6, 2022 at 7:05

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