Master Boot Record of This Hard Drive Is Damaged | How to Fix

Jean updated on Feb 22, 2020 to Partition Manager | How-to Articles

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/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.

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 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.

  • Download and launch EaseUS Partition Master on a new PC which runs the same system as yours.
  • 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.
  • Click "Proceed" to finish the process.
create a bootable disk

Step 2. Rebuild MBR.

  • Connect the bootable USB or CD/DVD to your PC.
  • 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.
  • Right-click the disk whose MBR is damaged. Choose "Rebuild MBR" to continue.
rebuild MBR
  • Select the type of MBR with the current operating system. Then, click "OK".
rebuild MBR
  • 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

Do You Need Specialized Services for System Boot Issues?
EaseUS also provides 1-on-1 remote assistance to fix the boot issue. If the solution above does not work for you, please contact our professionals via Email or LiveChat in this page. To ensure our professional assistance work, you are suggested to connect the unbootable system drive to a healthy computer when getting connected with us.

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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

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

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.

About EaseUS Partition Master

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