In Windows 7 and older versions of Windows, the boot sector loads the Windows Boot Manager, accesses the Boot Configuration Data, and uses this information to load the operating system. If this signature is corrupted or has been changed, the BIOS will not be able to find the boot sector and won't be able to load the necessary instructions for finding and starting the operating system. A boot sector must have a specific disk signature to be seen by BIOS as a boot sector. Boot sector - the region of the disk that contains the code to be loaded into the RAM memory, that is necessary to load the operating system.Obviously, MBR is usually found on older computers using BIOS and older operating systems such as Windows 7. Its purpose is to tell the computer’s BIOS where to look for the operating system so that it can start it. Master Boot Record (MBR) - the first sector of your system drive.EFI Bootloader is found on devices that use UEFI and (usually) GPT-partitioned drives and is most common on Windows 11 and Windows 10 modern computers. If this partition is damaged or if the files on it - the EFI Bootloader - are corrupted, your computer can’t start Windows. UEFI uses this partition to load the bootloader (EFI\Microsoft\Boot\bootmgfw.efi), which in turn handles the booting of Windows. EFI Bootloader - represents special files stored on a dedicated EFI partition.If you need to know what all these mean, here’s an explanation for each of them: With their help, you can repair your EFI Bootloader or Master Boot Record (MBR), write a new boot sector, rebuild the Boot Configuration Data (BCD) and add missing Windows installations to the boot configuration data. If your operating system has trouble booting and Startup Repair can't fix the problem, it's worth trying the Bcdboot and Bootrec tools. It doesn’t matter what Windows version you have, whether your PC runs on BIOS or UEFI, or whether your system drive uses MBR (Master Boot Record) or GPT. Bcdboot & Bootrec - The ultimate repair tools for boot problems in Windows However, the tools presented and the instructions apply to other Microsoft operating systems too, including Windows 8.1.
NOTE: This guide covers Windows 11, Windows 10, and Windows 7. Did you manage to repair the boot problems on your Windows PC?.2.2 How to repair your MBR (UEFI CSM or BIOS systems with MBR-partitioned drives).2.1 How to repair the EFI Bootloader for Windows 11 & Windows 10 (UEFI systems with GPT-partitioned drives).Use Command Prompt to fix issues with your PC’s boot records Start the Command Prompt using a recovery drive Bcdboot & Bootrec - The ultimate repair tools for boot problems in Windows.
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