Rebuild MBR with AOMEI Partition Assistant

March 11, 2022

Rebuild MBR could help you solve some problems such as system missing, or system could not boot up. Use the latest MBR repair tool - partition assistant to rebuild MBR easily and safely.

From time to time you may get the error message “system missing” or "operating system not found" when you boot up your system. Actually, this does not mean that your system does not exist; such errors are most likely caused by damaged Master Boot Record (MBR). In this case, you need to use some special tool to repair corrupted MBR to the computer without destroying any data. Now we have added the Rebuild MBR feature in AOMEI Partition Assistant. The following are the detailed steps about how to rebuild MBR with AOMEI Partition Assistant.

Before you do

  • Download the disk partition software first.
  • Supposing your computer can not boot, on this condition, you need to create WinPE bootable CD with AOMEI Partition Assistant on another computer. After that, you can start your computer and rebuild its MBR by using this Bootable CD to first boot into the computer which can not boot.
  • There is another way to rebuild corrupted MBR when your computer can not boot: Unplug your disk that need to be fixed and plug this disk to another machine or your friend's computer, and run AOMEI Partition Assistant on your friend's computer, and Rebuild MBR for the disk.

To Rebuild MBR

Step 1: Select the system disk which can not boot and right-click the disk to choose "Rebuild MBR", or in the left side interface of Aomei Partition Assistant, and select "Disk Operations"-> "Rebuild MBR".

Rebuild System Disk MBR

Step 2: Set up the type of MBR to rebuild in "Rebuild MBR" window. And then the program will set the type of MBR for your OS. (Choose a proper MBR type according to your operating system)

Choose MBR Type OS

Step 3: Click "Apply" on the toolbar to commit the operation.


  • Rebuild corrupted MBR only can solve problems such as MBR code has been damaged. It's beyond Rebuild MBR's ability to deal with OS unbootable problem which is caused by bootable file or system file missing.
  • Rebuild MBR would not lead to any kind of data loss. However, improperly Rebuild corrupted MBR might cause your computer unbootable. So, you'd better learn more relevant knowledge before you execute Rebuild MBR operation or please make a backup for this disk in advance.

  • Free version of Aomei Partition Assistant also has "Rebuild MBR" feature.