Best Free MBR Repair Tool for External Hard Drive in Windows 10/8/7

April 30, 2019

External drive MBR get damaged? Take it easy now! Here we’re going to present you the best free MBR repair tool for external hard drive-AOMEI Partition Assistant Standard. With it, you can easily fix corrupted MBR on external hard drive.


“I have a 1TB Seagate external hard drive that is damaged and I recently ran a scan with the HDD regenerator and it told me that the Master Boot Record is damaged. Anyone know any great MBR repair tool for external hard drive? Thanks a lot!”

Analysis about corrupted MBR on external hard drive

MBR is a boot sector of your hard disk that contains the important information about the partitions on your hard drive and loads the OS. MBR is created on the very first partition when you first install Windows. It’s the first 512 bytes of your hard disk.

Therefore, when MBR on your main hard drive gets damaged, you will usually meet various Windows boot failure error messages like “Error loading operating system” “Operating System not found”, “Invalid partition table” , “No bootable medium found”, “Reboot and select proper boot device”,etc. So learn how to repair damaged MBR is quite necessary for ensuring your computer functioning well.

But before that, you might want to know what can cause the MBR damage of external or internal hard drive, preventing possible MBR corruption in future. Generally speaking, there are three main causes for damaged MBR either on external hard drive or internal hard drive:

A virus infection: when a virus is loaded onto your computer, the MBR will become its prior target to infect since master boot record is the most important part of your hard drive.

A drive failure: if there are some defective clusters on the erea where the MBR is located on the hard drive, the master boot record is more likely to become unreadable.

MBR overwrite: if the master boot record is overwritten by some programs accidentally, it will become damaged as well.

Best Free MBR repair tool for external hard drive-AOMEI Partition Assistant

Now, back to the point- is there any professional MBR repair tool to fix damaged master boot record? Actually, when you Google online, many free MBR repair tools will come into your sight. To save your time, here we would like to recommend AOMEI Partition Assistant Standard. This free MBR repair tool comes with a feature named Rebuild MBR, which could help you easily and quickly repair the corrupted MBR of both external and internal hard drive in Windows 7/8/10/XP/Vista.

Now free download the powerful MBR repair software and learn how to repair damaged MBR on external hard drive.

Attention: If the corrupted MBR has caused your Windows unable to boot normally, you can also use AOMEI Partition Assistant Standard to make a bootable USB stick to access the currently non-bootable operating system. If your Windows can boot successfully, you can skip this part.

Step 1. Install and run AOMEI Partition Assistant Standard on your Windows computer, right click the external hard drive and select Rebuild MBR.

Rebuild Data Disk MBR

Step 2. Select the type of MBR for your current operating system.

Choose MBR Type

Step 3. Click Apply->Proceed to execute the pending operations.


Same steps can be applied to repair MBR on internal hard drive.

Fix the damaged MBR from Command Prompt

Besides using a professional MBR repair utility, another popular MBR repair solution is run the bootrec.exe/fixmbr command in the Command Prompt window. This always requires Windows system repair or installation disc.

Step 1. Put the original Windows installation DVD into the disk tray and boot your computer from it.

Step 2: Follow the wizard to choose “Repair your computer”> “Troubleshoot” > “Advanced” > “Command Prompt” (Windows 8/8.1/10). In Windows 7, select “Next” after choosing the operating system, in the System Recovery Options window, click on “Command Prompt”.

Step 3. When the Command Prompt loads, type the following commands:

bootrec /FixMbr

bootrec /FixBoot

bootrec /ScanOs

bootrec /RebuildBcd

However, it might not be considered as a wise choice for the common computer users without enough IT knowledge.


No matter you want to fix MBR via a MBR repair tool for external hard drive or using Command Prompt in Windows 7/8/10, above content can help you a lot. If you need to repair MBR on Windows Server computer, you can try AOMEI Partition Assistant Server version.