Last updated on October 6th, 2020

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الفرق بين تقنيه GPT و MBR وكيفية التحويل من GPT الى MBR والعكس - Duration: 6:30. مستر ابوعلى Mr Abu Ali 33,450 views 6:30. For Windows 7/8/10, type Bootrec /fixmbr, Bootrec /fixboot to fix MBR and boot sector. Use MiniTool Partition Wizard Bootable CD In addition, there is another way to repair corrupted MBR. To do this work, you can ask a third-party tool for help. Here MiniTool Partition Wizard.

How to fix or repair the damaged Master boot record (MBR)? In this article, we’ll provide 2 safe and reliable procedure to help you fix MBR error in Windows

Page Contents

What is MBR (Master boot record)

MBR is the master boot record of a hard disk. It is created on the first partition when you first install Windows.

MBR consists of three parts, i.e. Boot Loader, Partition Table, and Magic Number. A boot loader is a program that loads an operating system when a computer is turned on.

Partition table records partition information on local disks. Magic number(0xAA55/0x55AA) marks the device as a valid bootable media.

An invalid magic number indicates a corrupted or missing MBR. Master Boot Sector contains 512 bytes in total, of which the boot loader takes up 446 bytes, partition table 64 bytes, and magic number 2 bytes.

If the MBR is damaged, you won’t be able to boot into Windows.

When & Why you may need to Repair MBR in Windows

MBR ( Master Boot record) can be damaged by virus attack, power outage, and improper operations.

Most often MBR can get damaged, when you install two different operating systems and you delete the second OS (not the Windows) improperly.

As we have mentioned, if the master boot record (MBR) is broken, your computer will fail to boot and you may get the following errors message:

1.” Error loading operating system¬_”
2.”Operating System not found_” or “Operating System missing_”
3.”Invalid partition table_”
4.” Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key_”

How To Fix or Repair MBR Error?

Two Ways to Fix MBR in Windows XP, 7, 8, 8.1, 10

Normally, there are two ways to repair MBR. Follow the instructions below to repair MBR( master boot record) by yourself.

METHOD-1

1.Fix MBR with command prompt and installation DVD

Fix MBR with command prompt requires the original Windows installation DVD. The instructions are:

1. Boot from the original installation DVD.

2. At the Welcome screen, click “Repair your computer”.

3. Choose” Troubleshoot > Advanced options > Command Prompt“.

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4. When the Command Prompt loads, type the following commands in order:

bootrec /FixMbr

bootrec /FixBoot

bootrec /ScanOs

bootrec /RebuildBcd

Remember to press “Enter” after each command and wait for each operation to finish.

5. Remove the DVD from the disk tray.

6. Type exit and Hit “Enter”.

7. Restart your computer and check if Windows 8/8.1 can boot now.

Method 2: Use a third-party software

Another feasible method is by using a third-party software to repair MBR without Windows DVD. MiniTool Partition Wizard Bootable CD is among the most reliable one.

In addition, no professional knowledge is required, and only three steps are needed.

MiniTool Partition Wizard Bootable CD Helps to Fix MBR in Windows without Windows DVD

The detailed steps.

Step 1: First you will need to download the MiniTool Partition Wizard Bootable CD (Pwfree91.iso file) and burn the iso file to a USB drive with burning software.(Link is given below)

After that, connect the bootable flash drive to your computer.

Check out:How to create a bootable Windows 8.1 Flash drive

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Step 2: Set your computer to boot from the bootable media USB drive.

Below is a sample BIOS Boot settings. It could be different depending on the Motherboard.

step 3: Select to boot from the USB flash you have just created.

Step 4: Start your computer, your computer will boot from the USB flash drive.

You will see the following message. You should select “Boot from Partition Wizard Boot Disc” rather than “Boot from Local Drive”. Now press enter.

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Step 5: Once your PC boots from the Minitool Boot Disk will see the main window of MiniTool Partition Wizard, where all disks and partitions are shown.

To fix MBR for Windows, you will need to select the target disk and choose the function “Rebuild MBR”. Then click on the icon “Apply” to execute changes.

Minitool Boot Disk will repair the MBR and your system will reboot normally.

Now you can remove the bootable media and set your computer to boot from the system disk.

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Conclusion

MBR damage can cause a system boot failure. If you are prompted or need to fix or repair MBR in Windows 8, 7, Vista, XP, and even Windows Server, turn to the partition tool – MiniTool Partition Wizard Bootable CD.

It is totally FREE and we believe it can meet most users’ demands.

Click here for more information and Download :

This is a Guest post Contributed by Skylly of Minitool. For any further assistance or information about this tool, you can contact them at https://www.partitionwizard.com/support.html.

Hello! I am Ben Jamir, Founder, and Author of this blog Tipsnfreeware. I blog about computer tips & tricks, share tested free Software’s, Networking, WordPress tips, SEO tips. If you like my post /Tips then please like and share it with your friends.

MBR Is Corrupted

As you know, MBR is the master boot record on the hard drive in your computer. It is always created in your first partition, and it is very important for your hard drive. MBR contains the executable codes for the computer boot, which always locates in the first sector of your disk. If your disk MBR gets corrupted, the operating system will fail to boot.
Usually, when system is unable to boot, you can get some error messages or information, such as “A Disk Read Error Occurred”, “Operating System not found” or “missing operating system”. In these cases, you should consider that the master boot record is damaged. Why does MBR get corrupted? Generally speaking, there are some reasons, including virus infection, mistaken operation or sudden power failure.
When MBR damage happens, what should you do? In fact, it is very easy to repair corrupted MBR rather than reinstalling Windows OS, so just try the following ways.

How to Fix MBR

Run Bootrec

When it comes to MBR repair, some of you may refer to Windows built-in tool that is called Command Prompt. In order to do a boot sector repair, the first thing is that you should prepare a Windows installation disc, and then connect to your computer to start OS from this disc. Then start a restoration.
1. Launch Command Prompt. The way to open this tool is different, so just do according to a real situation.
2. Then type the following commands:
For Windows XP, type fixmbr, fixboot commands one by one.
For Windows 7/8/10, type Bootrec /fixmbr, Bootrec /fixboot to fix MBR and boot sector.

Use MiniTool Partition Wizard Bootable CD

In addition, there is another way to repair corrupted MBR. To do this work, you can ask a third-party tool for help. Here MiniTool Partition Wizard Bootable CD will be your good choice. As a reliable and professional MBR repair tool, it enables you to manage your disks and partitions when the operating system fails to boot or when there is no operating system. So in this post, the Bootable CD is available to do a repair. In order to fix the MBR and boot sector effectively, you need to download MiniTool Partition Wizard Bootable CD and then burn the .iso file to a CD/DVD or USB flash drive. Then do a repair as follows.
Step 1: Connect the flash drive or disc to your computer, then modify the boot order in BIOS to boot from this device.
Step 2: After your system boot, you will enter into the main interface of MiniTool Partition Wizard. Here right click the target hard disk to select “Rebuild MBR”. Also it is ok to click this feature from “Operations” menu.
Step 3: Then click “Apply” to make this change effective to repair corrupted MBR.
Like that, your master boot record and boot sector will be fixed. Then the computer can boot normally. In addition to rebuilding MRR, MiniTool Partition Wizard Bootable CD can do other disk and partition operations when system can’t boot, such as partition recovery, copy disk, extend/resize partition and so on. Hope this tool is useful to you.