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Fix for Master Boot Record of This Hard Drive Is Damaged

Updated on Aug 11, 2019 by Jean to Partition Manager

To fix the problem of Master Boot Record of this hard drive is damaged, follow the tips and solutions in this post, which have helped many people repair damaged or corrupted MBR on a hard drive, external hard drive, USB flash drive and memory card with success.

Master Boot Record of This Hard Drive Is Damaged

"I was told that Master Boot Record of this hard drive is damaged so I can't boot the drive as usual. Any solutions to fix a damaged MBR on a hard drive?"

The bad Master Boot Record (MBR) issue occurs to many owners of hard drives among various brands, such as Seagate, WD, Toshiba and Samsung, and the consequence of developing a corrupted or damaged MBR on a disk drive is much the same. Most of the time, you will get the following error messages which indicate a serious MBR problem:

The Concept of Master Boot Record

Before picking up a proper MBR repair solution, it's good to have a general understanding of MBR.

The Master Boot Record is an important data structure on a disk, which is created automatically when the disk has been initialized or the first partition is created. The MBR exists in the form of executable codes, which always reside on the first sector on the disk.

Like the disk layout for the MBR displays, the first 446 (0x1BE) bytes belong to the MBR itself, the next 64 bytes are the Partition Table, and the last two bytes in the sector are a signature word for the sector and are always 0x55AA.

the disk layout of mbr on a disk

2 Ways to Restore Damaged MBR on a Hard Drive/USB Flash Drive/SD Card

For your reference, to fix the problem of Master Boot Record of this hard drive is damaged, there are two troubleshooting ways:

Free MBR repair tool
Command Prompt

Method 1: How to Fix the Damaged MBR With a Free MBR Repair Tool

EaseUS Partition Master is the free MBR repair tool for you to deal with the damaged MBR on a disk. It's a powerful, easy-to-use and free partition manager software tool that can help you in disk and partition management.

Download Now

 Windows 10 is supported

Must-read tip for a successful MBR repair with EaseUS Partition Master:

If your Windows computer cannot boot properly due to the damaged MBR on the boot drive, you have to start by either connecting the hard disk to another working computer for repair or create an EaseUS Partition Master bootable disk in order to access the currently non-bootable operating system.

Now, follow the steps below to rebuilt MBR on your problematic disk.


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

Method 2: How to Fix the Damaged MBR From Command Prompt

In addition, advanced users can take a further step to manually fix the MBR issue from the Command Prompt. By this way, a Windows system repair disc is required.

Step 1: Boot your computer using the Windows bootable drive and press any key to boot from CD or DVD.

Step 2: Follow the wizard to choose "Repair your computer" > "Troubleshoot" > "Advanced" > "Command Prompt".

fix the damaged mbr from command prompt

Step 3: On the Command Prompt window, type these following commands and hit enter after each line of command:

Bootrec /fixmbr
Bootrec /fixboot
Bootrec /scanos
Bootrec /rebuildbcd