How to Fix or Repair Master Boot Record(MBR) in Windows 10

Brithny updated on Dec 10, 2018 to Partition Master | How-to Articles

What is the MBR

Master Boot Record (MBR), sometimes also referred to as the "master partition table" or "partition sector",  is a boot sector (a region of your hard disk) that holds information about the partitions of your hard drive and acts as a loader for the operating system you’re running.

The Master boot record is created when you first install Windows, on the first partition you create. It’s the first 512 bytes of your hard disk. Typically, the program begins the boot process by looking up the partition table to determine which partition to use for booting. It then transfers program control to the boot sector of that partition, which continues the boot process.

If the MBR is damaged, you won’t be able to boot into Windows. Because most of the Windows 10/8/7 boot like this:

BIOSMBRDPTPBRBootmgrBCDWinload.exeWindows NT load

If your MBR disk is damaged, you certainly cannot boot into Windows 10. How to repair the damaged MBR? Here we'll provide a safe and reliable procedure to help you. Just follow the directions below.

1 - Back up Data Without OS

Since you are unable to boot into Windows 10/8/7, you'd better back up data or your system without booting into OS. It’s wise to back up MBR or create a system recovery disk so that in case something happens you don’t have to run for the Windows Recovery Disk. After the backup, you can not only make sure that your data and system are safe, but also repair your MBR disk without any risk.

back up mbr data with easus todo backup

2 - Rebuild MBR with EaseUS Partition Master

EaseUS partition software has a feature called Rebuild MBR. Once MBR (Master Boot Record) of the disk is damaged, the system cannot be booted. This feature will rewrite the Master Boot Record of the selected disk without destroying the disk partition table.

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 Windows 10 is supported

Since your PC cannot boot properly, connect the MBR hard disk to another working computer for repair. Or create a WinPE bootable disk to make your computer bootable.

Step 1: Create a WinPE bootable disk.

1. Download and launch EaseUS Partition Master on a new PC which runs the same system as yours.

2. Click "WinPE Creator" on the toolbar. And select to create the bootable disk on a USB drive. If your computer has a CD/DVD drive, you can also create the bootable disk to CD/DVD.

3. Click "Proceed" to finish the process.

create a bootable disk

Step 2: Rebuild MBR.

1. Connect the bootable USB or CD/DVD to your PC.

2. Press "Del" when you are restarting the computer. Boot your computer from "Removable Devices" or "CD-ROM Drive". And then EaseUS Partition Master will run automatically.

3. Right-click the disk whose MBR is damaged. Choose "Rebuild MBR" to continue.

rebuild MBR

4. Select the type of MBR with the current operating system. Then, click "OK".

rebuild MBR

5. Click the "Execute 1 Operation" button at the top-left corner and click "Apply" to build the MBR. After that, your computer can boot normally again.

rebuild MBR

3 - Fix the MBR Using Command Prompt

Usually, you will see Windows Boot Options menu after your computer restarts several times. 

If not you need the original Windows 10 installation DVD to repair the Master boot record. Boot from the original installation DVD (or the recovery USB). At the Welcome screen, click Repair your computer. Then, you can follow the steps below to open command Prompt to fix MBR in Windows 10.

1. Choose "Troubleshoot > Advanced Options > Command Prompt".

2. When Command Prompt appears, enter the following lines and press Enter after each line: 

bootrec.exe /rebuildbcd
bootrec.exe /fixmbr
bootrec.exe /fixboot

In some cases, you may need to run some additional commands.

bootsect /nt60 SYS or bootsect /nt60 ALL

3. Press Enter after each command and wait for each operation to finish. Exit and now go ahead and reboot your system.

fix mbr error with command prompt

More Information

If you have fixed the MBR and still cannot boot, the following directions can help you.

Fix the "Bootmgr is missing" error.

Fix the "Operating System not found" error.


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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

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Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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