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Zorluk: ZorTroubleshooting Windows OS Startup and Boot Errors

A Windows 11 workstation equipped with UEFI firmware fails to start, displaying an error stating that the Boot Configuration Data (BCD) file is missing or corrupted. Automatic Repair is unable to resolve the issue. A system administrator boots the computer using Windows installation media to manually rebuild the EFI System Partition (ESP) boot loader from the Command Prompt. Place the technician's administrative steps in the correct chronological order from first to last.

  1. 1Boot the system using Windows setup media and navigate to the WinRE Command Prompt interface.
  2. 2Run diskpart commands to locate the hidden FAT32 EFI System Partition and assign it a temporary drive letter.
  3. 3Format the assigned EFI System Partition using the FAT32 file system to erase corrupted boot structures.
  4. 4Execute the bcdboot command referencing the main OS installation directory to regenerate UEFI boot files onto the partition.
  5. 5Exit Diskpart/Command Prompt and reboot the workstation to verify system initialization.

Cevap

The correct sequence begins with booting into the WinRE Command Prompt via installation media, using diskpart to identify and assign a drive letter to the hidden EFI System Partition, formatting that partition as FAT32, executing the bcdboot command to reconstruct the EFI boot store, and finally rebooting the workstation to confirm normal startup.
The correct order follows the standard procedure for repairing corrupted UEFI boot structures: first boot into an offline command shell, mounting/lettering the hidden EFI partition, wiping existing corrupt boot headers with a FAT32 format, writing new boot files with bcdboot, and rebooting to complete testing.

Adım Adım Çözüm

1
Boot from Windows 11 installation media and select 'Repair your computer' to open the WinRE Command Prompt.
Obtained offline administrative CLI access to the unbootable workstation.
System partition modification and offline BCD repairs require an unmounted, offline recovery environment.
2
Launch Diskpart, select the disk and EFI System Partition, and run 'assign letter=S'.
The hidden FAT32 EFI System Partition becomes accessible via drive letter S:.
UEFI bootloader recovery commands require a target drive letter path to apply new boot files.
3
Execute 'format S: /FS:FAT32' within Diskpart or Command Prompt.
The target partition is clean-formatted with the mandatory FAT32 file system.
Clearing corrupted file systems and damaged boot blocks ensures clean deployment of replacement boot infrastructure.
4
Run 'bcdboot C:\Windows /s S: /f UEFI'.
Fresh UEFI boot files and BCD entries are copied from C:\Windows into S:.
The bcdboot tool initializes the EFI System Partition with essential boot files and BCD configuration mandatory for UEFI startup.
5
Remove installation media, exit the command prompt, and restart the system.
The workstation successfully boots into the Windows operating system.
Rebooting verifies that the UEFI firmware correctly detects the restored EFI System Partition boot sequence.

Anahtar Kavram

Manual repair of corrupt UEFI/GPT boot structures using Diskpart and BCDBoot in WinRE.
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Troubleshooting Windows OS Startup and Boot Errors

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