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Difficulty: Very hardTroubleshooting Windows OS Startup and Boot Errors

An IT support technician is troubleshooting a Windows 10 computer that fails to boot following an improper shutdown. Upon starting, the system displays the error message "The Boot Configuration Data for your PC is missing or contains errors. Error code: 0xc000000f." The technician boots into the Windows Recovery Environment (WinRE) Command Prompt and attempts to repair the boot configuration by running `bootrec /rebuildbcd`. The command identifies the `C:\Windows` installation, but when attempting to add it to the boot list, it fails with the error message "The requested system device cannot be found." Further inspection using `diskpart` reveals that the system drive utilizes GUID Partition Table (GPT) formatting with an unlettered FAT32 EFI System Partition (ESP). Which of the following commands should the technician execute NEXT to successfully repair the boot files?

  1. Use `diskpart` to assign a drive letter to the EFI System Partition, exit `diskpart`, and execute `bcdboot C:\Windows /s S: /f UEFI` to regenerate the BCD store and boot configuration files.Answer
  2. B
    Execute `bootrec /fixmbr` followed by `bootrec /fixboot` to overwrite the Master Boot Record and re-establish the primary boot sector.
  3. C
    Run `sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows` to repair corrupted operating system binaries in the Windows component store.
  4. D
    Execute `bootsect /nt60 SYS /force /mbr` to force-update the master boot code on the active system partition.

Answer

Assign a drive letter to the EFI System Partition using diskpart and execute bcdboot to copy fresh boot files to the EFI partition.
When a Windows system configured with UEFI/GPT displays BCD error 0xc000000f and `bootrec /rebuildbcd` fails with 'The requested system device cannot be found', it indicates that WinRE cannot locate or write to the hidden EFI System Partition (ESP). The proper solution is to use `diskpart` to assign a temporary drive letter (such as `S:`) to the volume, exit `diskpart`, and use `bcdboot C:\Windows /s S: /f UEFI` to synthesize fresh boot environment files and recreate the BCD store on the ESP.

Step-by-Step Solution

1
Identify the system architecture and boot mode.
The disk uses GPT partitioning and UEFI boot architecture, which relies on a hidden FAT32 EFI System Partition (ESP) rather than an MBR boot sector.
Legacy boot recovery tools (`bootrec /fixmbr` or `bootrec /fixboot`) do not work on UEFI systems.
2
Diagnose why `bootrec /rebuildbcd` failed with 'The requested system device cannot be found.'
WinRE cannot locate the hidden EFI System Partition because it does not have a mounted drive letter.
Without an accessible drive letter for the ESP, boot repair utilities cannot write or update BCD store records.
3
Assign a temporary volume letter to the ESP in `diskpart` and run `bcdboot`.
Executing `bcdboot C:\Windows /s S: /f UEFI` creates new BCD environment data and copies required boot files directly from `C:\Windows` into the EFI partition.
The `bcdboot` command is specifically designed to initialize and repair the EFI system partition for UEFI-based Windows installations.

Key Concept

Troubleshooting UEFI/GPT Windows Boot and BCD Store Corruption
Estimated Time:2m 0s
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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