When the boot loader process fails, it will happen after you see the BIOS information but before Windows actually begins to load. To restore the Master Boot Record, type the following command and hit Enter. Once you’re at the Command Prompt, you’ll be using the bootrec command, and there are a couple of options that can be useful in fixing bootloader errors. The boot sector can experience the same types of problems as any other part of your hard drive-missing files, corrupted files, and even physical damage. On the Advanced Options page, click Command Prompt. It's this boot strapping process that allows the initial bits of the Windows code to start loading. The master boot code scans the partition table, determines the active partition, loads a copy of the boot sector into the PC's RAM, and hands off the startup process to that code. ![]() Your PC might have come with a recovery image that’s used to refresh or reset your PC. The BIOS then loads the master boot code into the PC's RAM and hands off the startup processes to it. Learn more If you run into problems with your PC running Windows, a USB recovery drive can help you troubleshoot and fix those problems, even if your PC won't start. ![]() ![]() When a PC starts, the initial power-on routine is handled by the BIOS. The boot sector also hosts the Master Boot Record (MBR), which contains the disk signature, partition table for the disk, and a small bit of code called the master boot code. The boot sector contains some code and data that helps BIOS hand off control of the startup process to Windows. The boot sector is a small section at the beginning of a hard drive that gets created whenever you format the drive.
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