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Rebuild MBR with AOMEI Partition Assistant

Rebuild MBR helps solve some issues, like system missing, operating system not found, black screen with blinking cursor. Use the MBR repair tool in Partition Assistant to rebuild MBR easily and safely.

AOMEI Post By AOMEI Updated April 8, 2024

Overview of Rebuild MBR

From time to time you may get the error message "system missing", "operating system not found" or black screen with blinking cursor 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 tools to repair corrupted MBR of 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.

How to Rebuild MBR

Before you do

  • Download and install the AOMEI Partition Assistant first.
  • Supposing your computer cannot boot, in this condition, you need to create WinPE bootable CD with AOMEI Partition Assistant on another working computer. After that, you can use the bootable media to start your computer into WinPE and rebuild its MBR.
  • There is also another way to rebuild corrupted MBR when your computer can not boot: Unplug your disk that needs 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 then Rebuild MBR on the disk.

How to Rebuild MBR with Partition Assistant

1. Select the system disk which can not boot and right-click the disk to sleect "Rebuild MBR".

Rebuild System Disk MBR

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

3. You can preview the operating by viewing the "Pending Operations". To commit the "Pending Operations", please click "Apply" and "Proceed".




By following the steps above, you can easily rebuild MBR of a system drive. The PC might boot after the rebuild operation if the boot issue is caused by corrupted MBR.

This feature is mostly used in case of system boot failure with the error message like "system missing", "operating system not found", or black screen with blinking cursor. It might be hard to fix other kinds of boot failure.



  • Rebuild corrupted MBR fearure can only solve problems like 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, improper rebuilding of 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 and important data in advance.

  • Aomei Partition Assistant Standard version also supports "Rebuild MBR" feature.



Q: If it is a GPT drive, is it possible and necessary to use the feature "Rebuild MBR"?

A: It is not necessary if it is a GPT drive because the "Rebuild MBR" tool is mainly for MBR drive.

Q: In which conditions and which boot error, can I use the "Rebuild MBR" tool?

A: This tool is mainly used to fix the system boot failure with the error message like "system missing", "operating system not found", or black screen with blinking cursor. In other cases, it might be hard to fix. You can use other professional repairing tool to fix the boot issue.

Q: How can I use the feature if my PC cannot even boot without installing the program?

A: You can create a bootable media on another working PC with Partition Assistant installed and boot your PC into WinPE to use the "Rebuild MBR" tool. Or, you can unplug your system drive and connect it to another working computer to rebuild MBR.