![]() ![]() Successfully scanned Windows installations. Please wait, since this may take a while. ![]() Scanning all disks for Windows installations. ![]() Typically the described repair procedure is similar to the following: When you do an Internet search for how to fix BCD-related errors, you will find many articles explaining how to use the bootrec utility to effect the repair. Note that the Microsoft Boot Manager ( bootmgfw.efi) is the only executable in the boot sequence which actually accesses the BCD store. Both graphics come from a UEFI-plugfest presentation by Murali Ravirala of the Microsoft Kernel Platform Architecture Team. I assume by now that the majority of readers of my blog are quite familiar with UEFI-based platforms so the contents of the above graphics should be self-explanatory. Here are two graphics which provide an overview of how a UEFI-based platform boots into the Windows 10 operating system: If the BCD store is missing, becomes corrupted, or is not properly configured, Windows 10 will not boot. First introduced in Windows Vista, these parameters were previously stored in the boot.ini file on BIOS-based platforms and as NVRAM variables in UEFI-based platforms. When I later powered on the laptop, it failed to boot and simply displayed the following message:Ī Boot Configuration Data (BCD) store (there can be more than one) contains boot configuration parameters which control how the operating system is started in Windows 10. I was prompted to write this post as a result of Windows 10 Professional recently attempting to do a silent update while I was waiting in an airport which I unknowingly interrupted when I powered down my UEFI-based laptop prior to boarding the plane. ![]()
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