How to Fix the MBR (Master Boot Record)


Let's fix the MBR

So, what is this thing called the MBR, and how am I supposed to fix it?


The MBR, which stands for Master Boot Record, encompasses the first sector of your hard drive, and serves the following three very important purposes on the disk:

  • Defines the partition layout on the disk, including the number of partitions, their size, location, etc. This layout is essentially the map of your disk, describing where the operating system can find the boot and other partitions and structures on disk. Without this layout there there are no partitions, no operating system, no data.
  • Maintains the Disk Signature, which helps the operating system remember the disk on which it's running. Under Windows, this allows drive letters to be reassigned to the same partition between reboots.
  • Contains the boot code for the disk, which starts the boot process and turns control over to the actual operating system.
Check out MBRWizard

Results of a Corrupt Master Boot Record

When the MBR becomes damaged or corrupt... the best case scenario is an operating system that assigns incorrect drive letters. After that, the problems become progressively more serious, such as a computer that won't boot, a destroyed operating system, or permanently lost data such as pictures, video, documents, etc. The most common MBR issue is when the boot code becomes corrupt, typically due to a virus or other malware, but also from errant applications and users with toolsets too powerful for their own good. When this occurs you will likely see one of the following messages when attempting to boot your computer:


> Missing operating system
> Error loading operating system
> Invalid partition table
> MBR Error 1
> MBR Error 2

These messages typically indicate that the boot code needs to be repaired, which normally allows the boot process to identify and redirect to the correct partition. There are a handful of software applications that have been designed to repair the MBR boot record, but most are command-line based, and can be very difficult and error-prone to use. Please note, if you aren't experienced with command line apps you may be in for a surprise. This is precisely the reason we developed MBRWizard... to provide a simple method to backup, restore, and repair your master boot record.

MBRWizard GUI Interface

Repairing the Master Boot Record (MBR) with MBRWizard

Repairing a corrupt MBR with MBRWizard requires just a few steps, and a moment of your time. To begin, start MBRWizard under Windows, which supports all versions of Windows starting with 2000 through Windows 8, including WinPE, and even Linux. Now, locate the disk with the corrupt MBR and select it as the live disk and click on repair. We are now on the Repair screen, which you see below... simply click on the MBR version you would like to use, and finally, click the Repair button. VoilĂ , the MBR boot code has been rebuilt to the same specs as when it was first created!

MBR Repair with MBRWizard
MBRWizard Versions and Features

MBRWizard Versions and Features

MBRWizard is delivered in two different flavors, fully designed to simplify the process of protecting and recovering the MBR:
1. Standard command line version for scripting and automation
2.Graphical Windows version to make managing the MBR a breeze.


Check out the following list of features provided in MBRWizard Suite, each designed to simplify the process of keeping your data safe, provide repair functionality, or offer additional technologies to ease the difficulties of managing the MBR:

  • Capture Backup files of the MBR and other critical sections of the disk
  • Restore previously backed up files, recovering disk sectors to an earlier state
  • Repair or rebuild a corrupt or damaged MBR
  • Keep a safe copy of your MBR online, located securely in the Firesage Cloud
  • Modify the Disk Signature
  • Manage disk partitions, including... create partition, delete partition, set active/bootable partition, set hidden or visible, and change partition type
  • Support for both removable and fixed disks. In fact, all operations can be performed on any disk in the system
  • Secure wipe the MBR or entire disk
  • Included Bootable media iso file, to help repair systems that can no longer boot

Repair and Protect the MBR

MBR Repair if necessary, otherwise Protect!

MBRWizard Suite

We are repeatedly asked, "Rather than attempt to repair unknown corruption in the MBR, wouldn't it be easier to simply restore the MBR from a previous backup?" Each time our response is the same... Absolutely!   Seriously, why would anyone want to risk their data to a single disk sector, that could fail at any time and destroy all the data located on the disk? Make sure you always have a safe backup of your master boot record saved to a safe location... you may never need it, but it's always better to be safe than sorry.

You never know when accidents may happen or malware may strike. MBRWizard can certainly repair a corrupt MBR, but why wait until disaster strikes? Check out MBRWizard Suite today ... and save yourself the headache of data recovery later!