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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

A technician boots a UEFI-based Windows 11 computer into the Windows Recovery Environment (WinRE) command prompt to resolve a boot error caused by a corrupted Boot Configuration Data (BCD) store. Place the recovery steps in the correct chronological sequence to assign a drive letter to the EFI System Partition (ESP) and rebuild the boot files.

  1. 1Launch the diskpart utility to inspect and manage disk volumes.
  2. 2Locate the hidden FAT32 EFI System Partition and execute assign letter=S to grant it a volume letter.
  3. 3Exit diskpart and run bcdboot C:\Windows /s S: /f UEFI to copy fresh boot files to the partition.
  4. 4Execute bootrec /rebuildbcd to scan all disks for Windows installations and rebuild the BCD configuration.

Answer

The correct sequence is: 1. Launch the diskpart utility to inspect and manage disk volumes -> 2. Locate the hidden FAT32 EFI System Partition and execute assign letter=S to grant it a volume letter -> 3. Exit diskpart and run bcdboot C:\Windows /s S: /f UEFI to copy fresh boot files to the partition -> 4. Execute bootrec /rebuildbcd to scan all disks for Windows installations and rebuild the BCD configuration.
To repair boot files on a UEFI/GPT system, a technician must first open diskpart to inspect hidden volumes, assign a drive letter (such as S:) to the FAT32 EFI System Partition, exit diskpart to use bcdboot to copy fresh boot files to S:, and finish by executing bootrec /rebuildbcd to update the Boot Configuration Data store.

Step-by-Step Solution

1
Start the disk management console
The command prompt enters the diskpart interactive shell.
Diskpart is needed to identify volume numbers and modify partition attributes not accessible via standard command prompt paths.
2
Select ESP and assign drive letter S:
The FAT32 system partition becomes accessible via drive path S:.
Command-line tools like bcdboot target specific drive letters when restoring UEFI boot structures.
3
Run bcdboot command
Fresh boot files are copied from C:\Windows into the S: partition formatted for UEFI firmware.
Recreating the main boot files restores missing or corrupted boot manager components.
4
Run bootrec /rebuildbcd
The Windows installation is detected and added to the newly restored BCD store.
Rebuilding the BCD store links the newly generated EFI boot files with the main OS partition.

Key Concept

EFI System Partition (ESP) identification and BCD repair sequence in WinRE
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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