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Fix Master Boot Record of This Hard Drive Is Damaged

Dec 01, 2017 / Posted 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 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, how to fix?

"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 occurrence of bad Master Boot Record (MBR) issue accompanies 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 got the following error messages which indicate a serious MBR problem.

<Invalid partition table>
<Missing Operating System>
<Operating System not found>
<Non-System disk or disk error>

Concepts of Master Boot Record

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

The Master Boot Record is an important data structure on a disk, and it's 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

Two Ways to Restore Damaged MBR on a Hard Drive, USB Flash Drive or 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

Guide 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 targeted at average users with little computer and IT background.

Must-read tips 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.

Step 1. Launch EaseUS free MBR repair tool, right-click the disk on which the MBR is damaged, choose Rebuild MBR from the menu and then choose the proper Operating System version.

choose rebuild mbr to fix the damaged mbr

choose windows operating system

Step 2. Click Apply. The software will now work hard to correct the bad MBR errors.

Guide 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