By AOMEI / Last Updated May 14, 2020

The MBR is corrupted in Windows 10

Master Boot Record (MBR) belongs to boot record, along with Boot Configuration Data (BCD). MBR will be created when the first partition on the hard drive is created and it is a very important data structure on the first sector of disk, which contains the partition table for the drive as well as a small amount of executable code for the boot start.

Once the MBR file is damaged or inaccessible, you may not be able to boot your system at all, and error information as "Operating System not found", "Error loading operating system", "Missing operating system" or "Invalid partition table" will show up. If you receive any of these errors, you need to fix MBR in Windows 10/8/7 to get rid of the boot issues. Usually, the MBR problem might be caused by malware infection, or improper shutdown.

How to fix MBR in Windows 10?-Two methods

To repair damaged MBR in Windows 10/8/7, you can try the following two methods. If you can access Command Prompt in Windows RE mode (with using Windows installation media), choose the first one to repair MBR via Command Prompt. If you don’t have Windows CD, you can turn to the second method.

Method 1. Fix MBR in Windows 10 via Command Prompt

To access Command Prompt in Windows RE mode, you can try the below 2 ways:

Way 1. Restart the Windows and as soon as you see the Windows logo; press and hold the power button to force shutdown it. Repeat this operation 2-4 times and Windows will open up boot options for you.
Way 2. Boot computer from Windows installation media, click on the “Repair your computer” and then “Troubleshoot” option to access Windows 10 boot options.

Access Cmd Win10

After getting into the “Advanced options” screen, click on “Command Prompt” to launch it. Then type the command bootrec.exe and “Enter” to see the options that are available for this tool. (There are four parameter available : /FixMbr, /FixBoot, /ScanOs and /RebuildBcd. Each of them can help you solve different boot problems.)

Fix Mbr

Execute /FixMbr in Windows 10 with Command Prompt. (/FixMbr allows the repair of a corrupted or damaged Master Boot Record. And you should use it when you meet one of these error messages: “Operating System not found", “Error loading operating system", “Missing operating system" or “Invalid partition table".)

Method 2. Fix Windows 10 MBR via freeware

If you want to repair MBR in Windows 10 without using Windows installation media or force restarting and shuting down the computer several times, you can use the freeware: AOMEI Partition Assistant Standard. That allows you to create a bootable USB drive on a working computer, then boot the PC with damaged MBR from it and finally rebuild MBR within 3 steps. Now free download it on a working computer and follow the steps given below:

Step 1. Install and launch AOMEI Partition Assistant Standard on a working PC. In the main interface, click Make Bootable Media in the left pane and follow the wizard to create a Windows 10 bootable USB drive.

Make Bootable Media

Step 2. Connect the bootable media created via AOMEI Partition Assistant Standard to the computer with a boot issue and enter BIOS to boot computer from the USB drive.

Step 3. Once logged in, the AOMEI Partition Assistant Standard will run automatically. In the main interface, right-click the system disk that contains corrupted MBR and choose Rebuild MBR.

Rebuild System Disk MBR

Step 4. Set the type of MBR for Windows 10 in the pop-up window. (Choose a proper MBR type according to your operating system.)

Choose MBR Type

Step 5. Click Apply and Proceed on the toolbar to commit Rebuild MBR operation.

Apply

Notes:
“Rebuild MBR” only can solve problems such as MBR code has been damaged. To deal with OS unbootable problem which is caused by bootable file or system file missing is beyond its abilities.
“Rebuild MBR” would not lead to any kind of data loss. However, improperly Rebuild MBR might cause your computer unbootable. So, you’d better learn more relevant knowledge before you execute Rebuild MBR operation.

To summarize

With 2 methods shared, you can easily fix MBR in Windows 10 now. The second method can also be applied to repair MBR in Windows 7/8/8.1. If you want to experience more advanced functions, such as migrating Windows 10 to GPT disk, allocating free space from D drive to C drive, clone MBR disk to GPT, you can upgrade to Professional version.