A technician is troubleshooting a UEFI/GPT-based Windows 11 workstation that fails to start after a partition resizing attempt. The system displays a black screen with the error message indicating that the boot configuration data is missing. The technician boots the machine into the Windows Recovery Environment (WinRE) Command Prompt to manually reconstruct the EFI System Partition (ESP) structures. Place the correct troubleshooting steps in sequential order to repair the boot files.
- 1Run `diskpart`, locate the hidden FAT32 EFI System Partition volume, and select it.
- 2Execute `assign letter=S` to map an available drive letter to the selected EFI System Partition.
- 3Exit `diskpart` and navigate to the assigned drive letter directory (`S:\`).
- 4Execute `bcdboot C:\Windows /s S: /f UEFI` to recreate the BCD store and copy firmware boot files.
Answer
The correct repair sequence requires identifying the EFI System Partition using diskpart, assigning it a temporary drive letter, exiting diskpart to access that drive volume, and running the bcdboot command targeting the new drive letter.
On UEFI systems utilizing GPT disks, startup information is contained within an unassigned FAT32 EFI System Partition (ESP). To repair corrupted BCD files manually, a technician must first open `diskpart` to locate and select the ESP volume, assign a temporary drive letter (e.g., `S:`), exit `diskpart`, and then execute `bcdboot C:\Windows /s S: /f UEFI` to write fresh system boot files to the partition.
Step-by-Step Solution
Key Concept
Rebuilding UEFI Boot Files and BCD via Diskpart and BCDBoot Utility