By Ailsa / Last Updated September 9, 2019

Boot Configuration Data (BCD)

Boot Configuration Data (BCD) is a database that can be used for loading and running operating system. BCD is stored in a data file and is mounted at registry key [HKEY_LOCAL_MACHINE\BCD00000]. For UEFI boot, the BCD file is located at /EFI/Microsoft/Boot/BCD on the EFI System Partition. For traditional BIOS boot, the BCD file is at /boot/BCD on the active partition.

When Boot BCD error occurs in Windows 10?

There are some situations that you might damage the BCD file, as follows:

  • Extend the System Active Partition;

  • An unexpected shutdown;

  • Blue screen or other errors that require a restart;

  • Hard drive failure;

  • Virus attack.

If you stuck in Boot BCD error in Windows 7/8/8.1/10, you might receive one of the following error messages:

  • Your PC/Device needs to be repaired. The Boot Configuration Data for your PC is missing or contains errors. File:\Boot\BCD Error code: xc000000f

  • Windows failed to start. A recent hardware or software change might be the cause. File:\Boot\BCD Status: xc000000f Info: An error occurred while attempting to read the boot configuration data.

  • There was a problem with a device connected to your PC. An unexpected I/O error has occurred. Error code: 0xc00000e9

  • Your PC needs to be repaired. The Boot Configuration Data file doesn't contain valid information for an operating system. File:\Boot\BCD Error code: xc0000098

  • File: \Boot\BCD Status: 0xc0000034 Info: The Windows Boot Configuration Data file is missing required information.

Well, how to repair Windows 10 BCD files easily while Windows 10 unbootable? Take a rest, we will show you the top 4 ways step by step at the following description.

Quick fix for Windows BCD repair

Take a rest, we will show you the top 4 ways step by step to do Windows 10 BCD repair at the following description. If you have a Windows installation disc or you could try to create Windows 10 installation media on Microsoft website, you could fix with command prompt.

Fix #1: Repair BCD store with Startup Repair

The Startup Repair option in the Windows Recovery Environment should repair the BCD store. Follow these steps to fix:

1. Put the Windows 10 installation disc in the computer, and start the computer to boot from this media.

2. Select a language, a time, a currency, and a keyboard or another input method, and then click Next.

3. Click Repair your computer.

4. Click Windows 10 to repair, and then click Next.

5. Click Startup Repair in the System Recovery Options dialog box.

6. Restart the computer.

After this, you could check if you can boot into Windows 10. If so, the problem has been solved.

Fix #2: Rebuild BCD in Windows 10 with Bootrec.exe tool

If the startup repair method does not resolve the problem, you can rebuild the BCD store by using the Bootrec.exe tool in the Windows Recovery Environment (Windows RE). Generally, The BCD store is located on the partition where the detail shows “Active : Yes”, and Info is “System” using DiskPart. You must remove the BCD store and recreate it, type the following commands to do so:

  • Bcdedit /export C:\BCD_Backup

  • ren c:\boot\bcd bcd.old

  • Bootrec /rebuildbcd

Note: Partition C: might not be the correct volume letter, you have to locate the volume letter using DiskPart for the system partition where the BCD store is located. Correct the right volume letter in these commands.

Fix #3: Windows 10 BCD repair with Command Prompt

If the above ways not working, you could try Command Prompt to repair BCD in Windows 10.

Insert the Windows 10 installation media into your corrupted Windows 10 computer.

Press F1, F12 or DEL key to access BIOS/UEFI to change the boot order to boot from the Windows 10 installation media.

After entering Windows Setup program, choose Repair your computer -> Troubleshoot -> Advanced options -> Command Prompt.

Run the following commands in turn:

  • Bootrec /fixmbr

  • Bootrec /fixboot

  • Bootrec /rebuildbcd

Fix #4: Windows 10 BCD repair via AOMEI Partition Assistant

If you don’t have a Windows 10 installation disc, you have to create a bootable media first then repair BCD. The best Windows 10 BCD repair tool - AOMEI Partition Assistant is such a thing, which is a comprehensive and reliable software to manage hard disk and partitions, and most important it allows you to create bootable media and repair Windows 10 BCD file (Rebuild MBR). The steps listed below:

Before you do, prepare a USB flash drive (at least 16GB), a normal Windows 10 computer has the same operating system as yours (32 bit or 64 bit). And then free download AOMEI Partition Assistant on this computer.

1. Put the USB drive into the normal Windows 10 PC. Run AOMEI Partition Assistant, Please select Make Bootable Media under Wizards at the left panel on the main window. Hit Next.

Make Bootable Media

2. Tick USB Boot Device, press Proceed to create Windows 10 bootable media.

Choose Usb Drive

3. Then boot your corrupted Windows 10 PC from this bootable media, you will see the AOMEI Partition Assistant software on the desktop, just execute it.

4. Select the system hard disk and choose Rebuild MBR at the drop down menu.

Rebuild System Disk MBR

5. Choose MBR type for Windows 10.

Choose MBR Type

6. Click Apply at the top of window to repair Windows10 BCD file.

Now, the Windows 10 BCD repair should be successful and the problem could never bother you again. In addition, AOMEI Partition Assistant can fix NTLDR is missing, BOOTMGR is missing and other unbootable issues. Definitely, you could extend, split, move, format, resize, and delete partition if required. Or you could upgrade to Professional edition with all the advanced features. For server users, take a shoot with the Server or Unlimited edition.