Encountered MBR Error 1 on Windows? Check the Causes and Fixes Here

A computer locates its operating system through the MBR (Master Boot Record). If the MBR is corrupted, you won't be able to access your OS. **Error MBR 1** occurs at startup and signifies a damaged MBR. This guide will help you identify the causes of Error MBR 1 and offer effective solutions.

The tools needed to check for MBR errors:

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Read on to learn more about fixing MBR error 1.

What causes MBR Error 1?

MBR Error 1 typically occurs during the Windows startup process. If the startup fails, you might see an error message like "MBR Error 1," "MBR Error 2," or "MBR Error 3." Of course, you might not receive any error message at all. There are three main causes for MBR Boot Error 1:

• Incorrect BIOS Boot Order: If, for some reason, the boot order changes or you incorrectly set a different drive as the boot drive, your computer won't start.
• Corrupted or Virus-Infected MBR: A damaged MBR might lead to a Windows MBR Error 1 when starting up your computer. You'll need to repair the MBR to resolve this issue.
• Operating System Boot Error with External Disk Connected: If you have an external drive connected, your computer might mistakenly try to load the system from that drive.

Whatever the reason that leads you to get MBR error 1, 2, or 3, you can quickly fix the MBR error with the effective methods provided in this article.

How do I fix MBR error 1?

We will suggest a few suitable measures to fix MBR error 1 based on the above reasons. The easiest way is to disconnect all external devices and restart your computer. If this method fails, proceed with the fixes below.

If you find any of these methods helpful in resolving the issue, please feel free to share the article with others who might need it.

Solution 1: Change the BIOS boot order

One of the most common reasons for MBR error 1 is a change in the default boot order. Before attempting any other repair methods, you should check if the BIOS boot order is correct.

Method 1: Change the Boot Order in BIOS

Here is a step-by-step guide:

Step 1. Restart your computer and press F2/F12/Del to enter BIOS. If your computer won't boot, you might need to use a Windows installation media or a bootable USB drive.

Step 2: On the BIOS Setup utility screen, select the Boot option.

Select the boot option:

The first boot option should usually be the hard drive. If not, use the “+” or “-” keys to move the device up or down in the list until it is.

Step 4: Save and confirm the change in boot order.

Method 2: Setting the Boot Order with Automation Software

You can use a third-party disk partition manager - AOMEI Partition Assistant Professional, which has a newly added Boot Repair feature that can help you change the boot order in UEFI.

If your computer's motherboard supports the UEFI boot mode, here are the detailed steps to fix MBR error 1 with a single click:

Step 1: Launch Partition Master on your computer and then find the “Boot Repair” section in the “Toolbox”.

Step 2: In the UEFI item, rearrange the boot order by dragging the drive to the first position.

Drag to change the boot drive

Click “Save” to apply the changes, and your operating system will boot from the new hard drive.

Note: If you click Restart after installing the drive, the operating system will boot from that disk once the next time it starts up.

Then, restart your computer and see if the MBR error 1 is fixed. If not, your MBR might be corrupted.

Fix 2: Use an MBR Repair Tool

If your computer fails to boot, you'll need to use a Windows installation media to restart and repair the damaged MBR. This process can be complex, so it's recommended to use a professional MBR repair tool like Partition Master. It offers the function of rebuilding MBR, allowing you to fix the MBR with just a few simple steps. With this safe and reliable tool, you can easily boot your computer without losing data.

Download this powerful tool, and then follow the steps below to fix the MBR:

Step 1: Create a bootable WinPE disk

Launch Partition Master, and click “Bootable Media” from the toolbar. Select “Create Bootable Media.” Click “Next” to finish the process.

Create a bootable disk

Step 2: Boot into Partition Master Live USB

Connect the bootable USB or CD/DVD to your computer. Restart your computer and press F2 or Del to enter the BIOS settings. Set it to boot from “Removable Device” or “CD-ROM Drive,” and the Partition Master tool will run automatically.

Step 3: **Rebuild MBR**

Click on “Tools,” and then select “Rebuild MBR.”

Select the disk and MBR type, then click “Rebuild”.

You will then see a message that states “MBR for Disk X has been successfully rebuilt.”

This powerful tool also supports fixing more disk or partition errors. Click the link below to fix if needed.

Fix 3: Repair MBR using CMD If you suspect that the MBR (Master Boot Record) is causing your computer to fail to start, you can try repairing it using the Command Prompt (CMD). Here are the steps to repair MBR with CMD: 1. Insert the Windows installation CD/DVD or USB drive and restart your computer. 2. During the startup process, press F2, F10, F12, Esc, or Del (depending on your computer brand) to enter the BIOS settings and set the boot device priority to the CD/DVD drive or USB drive. 3. Press Enter to start booting from the installation media. Choose your language and keyboard layout, then click "Next." 4. Click "Repair your computer" > "Troubleshoot" > "Advanced options" > "Command Prompt." 5. In the Command Prompt window, type the following command and press Enter: ``` bootrec /fixmbr ``` 6. After completion, type: ``` exit ``` This will exit the Command Prompt and return you to the "Troubleshoot" menu. 7. Select "Restart," then remove the installation media and let your computer boot normally from the hard drive. Please note that this step will overwrite any non-Windows MBR boot loaders. If you have other operating systems installed, you might lose the boot information. Make sure you are aware of the potential risks before proceeding with this operation.

If you're comfortable with command-line tools for computers, you can use the Windows Media Creation Tool to create Windows installation media. Then set the installation media as the first boot order and rebuild the MBR following these steps:

Note: This method requires a certain level of computer proficiency. Please exercise caution when entering parameters to avoid errors.

Step 1: Boot your computer from the Windows installation media.

2. Select Troubleshoot > Advanced options > Command Prompt.

Step 3. Type each of the following commands, pressing Enter after each one:

Step 4: Eject the installation media, and then restart your computer.

Note: These steps do not apply to Windows 7. If you need to rebuild MBR in Windows 7, enter WinRE. For detailed steps, please click here.

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Conclusions

These are the causes and solutions for MBR error 1. This article provides three effective repair methods. This method also works for MBR error 2 and MBR error 3. The most likely reason for all MBR errors is that the MBR is corrupted. Hence, you can use the Partition Master tool to resolve boot issues quickly and securely.

Frequently Asked Questions About MBR Error 1

There are a few other issues related to MBR error 1 that you might be interested in reading about, if you're so inclined.

1. What is MBR Error 2?

Error 0x0000007B may appear after you've deleted or added something. This error signifies that your Master Boot Record table is corrupted, and as such, there's an issue with loading the operating system, and the boot device can't be found.

2. What is MBR Error 3?

MBR Error 3 is also a boot-time issue, and you may have multiple drives connected or a dual-boot system. This error code also refers to a failure in the Master Boot Record. The causes and solutions could be similar to MBR Error 1 and MBR Error 2.

How do I fix the MBR using CMD?

To repair the MBR using CMD, you'll need to be familiar with command-line codes and have a bootable media to start your computer. Follow these steps to fix the MBR with CMD:

Step 1. Go to Choose Options > Advanced Options > Command Prompt.

Step 2: Type the following command and press Enter:

These are commands used in the Windows operating system to repair the boot record: - `bootrec /fixmbr` - Fixes the Master Boot Record. - `bootrec /fixboot` - Writes a new boot sector to the system partition. - `bootrec /scanos` - Scans all system partitions for valid Windows installations. - `bootrec /rebuildbcd` - Rebuilds the Boot Configuration Data (BCD), restoring lost or damaged boot entries.