How To Back Up And Restore The Bcd File In Windows 10
Anybody who’s worked with the Registry knows that mistakes or errors can cause horrible problems, including total system failure. Working with BCD is the only aspect of Windows administration that is even more dangerous than working with the Registry. That’s because errors inevitably cause boot failures. The Windows Boot Manager invokes winload.exe—the operating system boot loader—to load the operating system kernel executive (ntoskrnl.exe) and core device drivers.
Fix The Mbr – Guide For Windows Xp, Vista, 7, 8, 8.1, 10
bootrec /fixboot — This options writes a new boot sector to the system partition. Fixes damaged boot sectors, non-standard boot sectors, and issues caused by the installation of earlier Windows operating systems (pre-Vista). Boot Configuration Data (BCD) was introduced in Windows Vista by Microsoft. It replaced the boot.ini file in Vista. The BCD holds important boot-related information including the list of the available operating systems.
- Please NOTE that it is not backwards compatible with standard YUMI.
- Supported distributions are limited, and your USB drive must be Fat32 formatted to support booting in UEFI mode.
- The following YUMI UEFI version is a work in progress that utilize GRUB2 for both UEFI and BIOS booting.
- If it still does not boot, try running the Startup Repair again and if that fails, go to the next wikidll.com/microsoft/wininet-dll method below.
On Windows 10 systems, you need to have the original installation media (DVD or USB drive) in order to access Command Prompt. Traditional YUMI is not natively UEFI capable.
For UEFI boot, the file is located at /EFI/Microsoft/Boot/BCD on the EFI System Partition. For traditional BIOS boot, the file is at /boot/BCD on the active partition.
A computer can optionally have many non-system BCD stores. Figure below shows an example of how the BCD hierarchy is implemented in a typical BCD store. When I encounter these errors, I sometimes find that some of the bootrec commands listed here fail when run from a usb boot drive. But I’ve found boot problems like this have been becoming more complicated to fix with recent versions of Windows. MS even know about the problem, and don’t appear to think it is an issue as they say Windows 10 now has ‘better’ ways of fixing problems.