EFI System Partition Corrupted BCD Rebuild Procedure
Repair corrupted or missing Boot Configuration Data (BCD) on the UEFI EFI System Partition using Diskpart and the bcdboot command in Windows Recovery.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Windows fails to start with error code 0xc000000f, 0xc0000034, or 0xc0000098
- Screen displays: The Boot Configuration Data for your PC is missing or contains errors
- Automatic Startup Repair fails repeatedly with SrtTrail.txt log error
Interactive Fix Checklist
0 of 4 steps completedOpen Command Prompt in Windows Recovery Environment
Boot from Windows USB installation media, select Next -> Repair your computer -> Troubleshoot -> Advanced options -> Command Prompt.
Identify EFI FAT32 system partition with Diskpart
Run diskpart, then list volume. Identify the small FAT32 volume (typically 100MB to 260MB in size). Run select volume X (replace X with EFI volume number), then assign letter=S: to mount it.
Format corrupted EFI partition
If the partition file structure is damaged, format it cleanly in diskpart: format fs=fat32 quick label="ESP". Type exit to return to command prompt. DATA SAFETY: Triple-check that you selected the small EFI partition (100MB to 260MB FAT32) and NEVER your main Windows C: drive or data volume, as formatting will permanently erase all data on the selected volume.
Rebuild BCD store using bcdboot
Execute command: bcdboot C:\Windows /s S: /f UEFI. If your Windows installation resides on another drive letter, substitute C: with that letter. Verify output: Boot files successfully created.
Still having trouble with your PC?
Describe what is happening to your AI Technician. We will tailor the fix to your exact hardware setup.