MBR has corrupted, what will happen next?
The MBR (abbreviation for “Master boot record”) is a boot sector (a region of your hard disk) that stores the information about the partitions of your hard drive and acts as a loader for the operating system you’re running.
Therefore, if the MBR is corrupted or damaged, you won’t be able to boot your operating systems as normal. At that moment, there is a possibility that you will encounter the following errors:
Error loading operating system
No bootable medium found
Reboot and select proper boot device
Well, there might also be other error messages, depending on different factors, but most of them are caused by a damaged boot record.
How to fix and repair damaged MBR in Windows 10/8/7?
So, how to fix MBR Windows 7/8/10? In this guide, you’ll get a full guide to repair the Master Boot Record on your PC. Moreover, we will show you how to do the job in two different cases: with and without installation media. Now, let’s get started…
Case 1: Fix MBR without installation DVD/CD/USB
Sometimes, you might have found a great way to fix the boot record, but that required an installation DVD in hand. What to do if you don’t have one? Under this situation, you need to first create a bootable media via a third-party software. AOMEI Partition Assistant Standard could help you with that.
Here comes the detailed instruction to make a bootable USB and fix MBR with this freeware.
Step 1: Connect an empty USB (it’s better to be over 8GB) to a working Windows-based computer (since your Windows 7 cannot boot). Then download the free MBR repair tool.
Step 2: Install and run AOMEI Partition Assistant. Click on the Make Bootable Media in the left pane. Follow the wizard to create a WinPE bootable USB disk. Disconnect the USB drive after it is done.
Note: AOMEI Partition Assistant Standard is pre-installed on the bootable drive.
Step 3: Plug the USB to your computer with a corrupted MBR, power up it and enter BIOS by constantly pressing Del (F2 or another specific key).
Step 4: Change boot priority to the bootable USB drive in BIOS. Press F10 to save the changes and restart computer to Windows PE mode.
Step 5: Once logged in, the AOMEI Partition Assistant Standard will load and start. In the main interface right click the system disk you need to repair and click Rebuild MBR.
Step 6: A mini window will pop out, choose the proper MBR type for Windows 7 and click OK.
Step 7: Click Apply->Proceed in the main interface to commit the change.
Finally, remove the bootable drive and restart your Windows 7. This method could also apply to fix MBR for Windows 10/8/8.1/XP/Vista.
Case 2: Repair MBR with installation media CD/DVD/USB
If you have kept your installation disc, you can try the following guide to fix MBR. Since different Windows comes with different repair process, we provide detailed guide to fix MBR in Windows 7, Windows 8 and Windows 10.
Part #1: Fix the MBR in Windows 7
In order to fix MBR for Windows 7, first please put your original Windows 7 installation DVD into the computer's DVD or CD drive. Then do as the guide below.
Step 1: Boot your computer from the Windows 7 installation DVD.
Step 2: When the message Press any key to boot from CD or DVD… shows up, press any key to boot from the DVD.
Step 3: Select a language, keyboard layout and click Next.
Step 4: Select the operating system and click Next. In the System Recovery Options window, click on Command Prompt.
Step 5: When Command Prompt successfully launched, type the following commands and press enter each time:
Remove the installation DVD from the disk tray and restart your computer.
Part #2: Fix the MBR in Windows 8/8.1/10
Similar to the windows 7 MBR repair, you should first put the original Windows 8/8.1/10 installation DVD into the disk tray and boot your computer from it.
The guide is:
Step 1: At the Windows Welcome screen, click Repair your computer.
Step 2: Choose Troubleshoot->Command Prompt.
Step 3: When the Command Prompt loads, type the following commands:
Press Enter after each command and wait for each operation to finish.
Remove the DVD from the disk tray. Restart your computer and check if Windows can now boot.
Hope you all can fix MBR in Windows 7/8/10 by using the methods introduced in this article. Apparently, AOMEI Partition Assistant is a better choice. With it, you can quickly and easily fix MBR instead of inputting the complex commands. Besides, this versatile software could also empower you to check disk errors after the MBR fix, which will ensure there is no bad sectors on the system disk. If you want to fix or rebuild MBR in Servers, please try AOMEI Partition Assistant Server.