what option would you use with the bootrec command to write a new mbr?

This guide shows you how to fix the Master boot record (MBR) in any of the Windows versions: Windows 10, Windows 11, Windows XP, Vista, 7, or Windows viii.

Contents

• 1 What is the MBR
  • one.i Backup
  • 1.2 Restore
  • 1.3 Common errors
• 2 Fix the MBR with Easy Recovery Essentials
• 3 Fix the MBR in Windows XP
• iv Fix the MBR in Windows Vista
• v Gear up the MBR in Windows seven
• vi Fix the MBR in Windows viii or 8.1
• vii Ready the MBR in Windows 10
• eight More Information
  • 8.ane Back up Links
  • 8.2 Applicable Systems

What is the MBR

The MBR (stands for "Primary boot tape") is a kick sector (a region of your hard disk) that holds information virtually the partitions of your hard drive and acts every bit a loader for the operating system yous're running.

The Chief boot record is created when you first install Windows, on the offset division you create. It's the first 512 bytes of your hard disk.

If the MBR is damaged, you won't be able to kicking into Windows. All Windows versions – Windows XP, Vista, 7 or 8 – use MBR and, if damaged y'all won't be able to boot.

It tin be damaged by certain viruses that target the MBR to replace it with their ain code or in cases when y'all dual boot with a Linux distribution (meet Error: no such segmentation. Grub rescue article).

Backup

You can backup the MBR since it'south stored on the hard deejay and you lot restore it later, when needed.

You only need one command to backup the MBR:

dd if=/dev/sda of=/path-to-salve/mbr-backup bs=512 count=1

In the to a higher place control, /path-to-salvage/mbr-backup is the path where you want to salve mbr-backup.

Restore

Important: Restoring your Master boot record with the incorrect segmentation table will make your data unreadable and will arrive very hard to recover your data later.

You can restore the saved Master boot record using this command:

dd if=/path-to-get/mbr-backup of=/dev/sda bs=512 count=1

In this command, /path-to-get/mbr-fill-in is the path where you have the mbr-fill-in stored.

Common errors

If the Master kicking record is broken, your computer may show some of the post-obit errors:

• Error loading operating system (encounter our Mistake loading operating system: Set up for Windows XP, Vista, 7, 8, 10 guide)

The "Fault loading operating system" mistake

• Operating System not constitute(meet our Operating System non found or missing: Fix for Windows XP, Vista, 7, eight, x guide)

The "Operating system non found" error

• Invalid sectionalisation table(see our Invalid sectionalization table: Gear up for Windows XP, Vista, 7, viii, 8.one and 10 guide)

The "Invalid segmentation table" mistake

• No bootable medium found(see our No bootable medium institute: Fix for Windows XP, Vista, 7, 8, viii.one and 10 guide)

The "No bootable medium institute" mistake

• Reboot and select proper kicking device(see our Reboot and select proper boot device: Set up for Windows XP, Vista, vii, 8 and 10 guide)

The Reboot and Select proper boot device fault

Other errors tin can exist shown, depending on many factors, that are caused past a damaged boot record.

Fix the MBR with Easy Recovery Essentials

Easy Recovery Essentials, our bootable recovery and repair CD/USB, is guaranteed to repair most amercement done to the Master boot record (MBR) using its Automatic Repair characteristic for Windows XP, Vista, vii or 8:

1. Download Easy Recovery Essentials. Choose your Windows version (XP, Vista, seven or 8) earlier downloading.
2. Burn the image. Follow these instructions on how to fire the bootable ISO prototype very carefully, as making a bootable CD tin exist catchy!
3. Kick Easy Recovery Essentials
4. Choose Automated Repair option and click Continue

   

   Choose "Automated Repair" in Easy Recovery Essentials

5. Cull your Windows installation bulldoze's letter of the alphabet (usually it's C:\) and click on Automatic Repair
6. Like shooting fish in a barrel Recovery Essentials volition at present begin

   

   Piece of cake Recovery Essentials Starts the Procedure

7. Once the process is consummate, click Restart
8. Done. Windows XP, Windows Vista, Windows 7 or Windows 8 should properly load now.

   

   Windows XP, Vista, vii, 8 Loading Successfully

You tin can download Easy Recovery Essentials from here.

Fix the MBR in Windows XP

Windows XP users tin utilise the fixmbr control to repair the MBR. You need the original Windows XP installation CD to run Recovery Console and run the fixmbr utility.

If you don't have the Windows XP installation CD to run Recovery Console, go to Prepare MBR with Piece of cake Recovery Essentials.

The fixmbr command is but available for Windows XP and Windows 2000.

The instructions to run fixmbr are:

1. Boot from the Windows XP CD
2. At the "Press any key to kicking from CD…" message, press whatever fundamental to boot into the CD
3. When the Welcome to Setup screen appears, press R to open Recovery Console

   

   Windows XP Press R for Recovery Console

4. At the "Which Windows installation would you like to log onto" question, type 1 and hit Enter, if your Windows XP is the only operating system on your hard drive
5. At the "Blazon the Ambassador password" question, enter the password and hit Enter afterward
6. Blazon fixmbr

   

   The fixmbr in Command Prompt

   If the "Are yous sure you desire to write a new MBR?" message appears, press Y and hit Enter

7. Press Enter
8. Wait for the process to finish. The fixmbr utility software volition repair whatsoever damage to the main kick record.
9. Remove the Windows XP CD
10. Type go out
11. Printing Enter to restart your computer

If you weren't able to boot your computer because of a damaged MBR, the above instructions should fix it and your Windows XP should start normally.

If the fixmbr command doesn't work, effort using the map control to get the right bulldoze name where you desire to repair the Master kick record:

1. Type map
2. Hit Enter
3. Wait for the output of the map utility:

   C: NTFS 1024MB \Device\Harddisk0\Partition1 Due east: \Device\CdRom0

   The above output is an example. The output for your calculator can exist dissimilar, but note the drive letter for the item with Harddisk0, in this case C:\.

Fix the MBR in Windows Vista

Windows Vista uses a dissimilar utility to fix the MBR than XP does, the bootrec control.

You need your original Windows Vista installation CD/DVD to run the bootrec utility.

If you don't have the Windows Vista installation CD/DVD to run Command Prompt, go to Set up MBR with Easy Recovery Essentials.

The instructions are:

1. Boot from your Windows Vista installation CD or DVD
2. Choose your language and keyboard layout
3. At the Welcome screen, click on Repair your computer

   

   Windows Vista Repair Your Computer Menu

4. Choose the operating arrangement and click Adjacent
5. When the System Recovery Options window appears, click on Command Prompt
6. When Command Prompt appears, type these commands:

   bootrec /FixMbr bootrec /FixBoot bootrec /RebuildBcd

   You lot can type bootrec.exe for a full description of higher up commands.

7. Press Enter after each command
8. Wait for the operation to finish. If it was a success, a confirmation message will announced on the screen.
9. Remove the CD/DVD from the disk tray
10. Blazon exit
11. Hit Enter and restart your computer

You can run Startup Repair for Windows Vista before running bootrec.exe to try and fix the boot error automatically. The steps to run Startup Repair are:

1. Kick from the installation CD/DVD
2. Click on Repair your computer, afterward you select the language and keyboard layout

   

   Windows Vista Repair Your Computer Carte

3. Choose your operating system from the listing, click Next
4. When the System Recovery Options dialog appears, click on Startup Repair

   

   Windows Vista System Recovery Options

5. Expect for the process to finish. Restart your computer when prompted by the system

Some other alternative is to completely rebuild the BCD, if the bootrec /rebuildbcd control doesn't work. When y'all are at the Command Prompt, type the post-obit commands:

bcdedit /export C:\bcdbackup c: cd boot attrib bcd -s -h -r ren c:\boot\bcd bcd.fill-in bootrec /rebuildbcd

Later on each command, hit Enter.

Fix the MBR in Windows seven

Yous need your original Windows 7 installation DVD to boot into System Recovery Options and run Command Prompt.

If you don't have the Windows vii installation CD/DVD to run Command Prompt, go to Set MBR with Easy Recovery Essentials.

The instructions are:

1. Boot from the Windows 7 installation DVD
2. At the "Press any key to boot from CD or DVD…", press whatsoever cardinal to kicking from the DVD
3. Select a language
4. Select a keyboard layout
5. Click Next
6. Select the operating system and click Next. The "Utilize recovery tools that tin can help fix problems starting Windows" must be checked when you select the operating organisation.
7. At the System Recovery Options screen, click on Control Prompt

   

   Windows 7 System Recovery Options Screen

8. When Command Prompt successfully loads, type this control:

   bootrec /rebuildbcd

9. Printing Enter
10. Blazon the next control:

    bootrec /fixmbr

11. Printing Enter
12. Blazon the next command:

    bootrec /fixboot

13. Press Enter
14. Remove the installation DVD from the disk tray and restart your computer

If bootrec /fixmbr and bootrec /fixboot doesn't work, try restoring the kicking sector code of your Windows seven:

1. Make up one's mind the drive letter of the alphabet of your Windows installation CD/DVD by typing these commands in the Command Prompt:

   diskpart select deejay 0 list volume

2. Look for the "CD-ROM" discussion in a "Type" column. This item is your CD/DVD installation drive alphabetic character. If the drive letter of the alphabet is D:\, type these commands:

   exit D: cd boot dir

   If the drive letter is different than D:\, replace the 2nd control with the drive letter you take noted from the previous list volume control.

3. Type this control:

   bootsect /nt60 SYS /mbr

4. Press Enter
5. Remove the CD/DVD from the deejay tray
6. Type exit
7. Press Enter to restart your reckoner

Prepare the MBR in Windows eight or 8.one

You lot demand the original Windows viii or viii.1 installation DVD to repair the Master kick record.

If you lot don't have the Windows 8/8.one installation CD/DVD to run Control Prompt, go to Set up MBR with Piece of cake Recovery Essentials.

The instructions are:

1. Boot from the original installation DVD (or the recovery USB)
2. At the Welcome screen, click Repair your computer

   

   Windows 8 Repair Your Computer Bill of fare

3. Choose Troubleshoot
4. Cull Control Prompt
5. When the Control Prompt loads, type the following commands:

   bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd

6. Printing Enter after each control and wait for each operation to finish
7. Remove the DVD from the disk tray
8. Type exit
9. Hitting Enter
10. Restart your computer and cheque if Windows eight/eight.one can at present kicking

If bootrec utility doesn't fix your Windows 8/8.1, effort post-obit the next commands to fix the EFI bootloader of the Windows viii/8.1:

1. Kicking from the installation DVD or the Windows eight or Windows 8.ane recovery USB
2. Click Repair your computer
3. Choose Troubleshoot
4. Choose Command Prompt
5. Type these commands in order and striking Enter after each:

   diskpart sel disk 0 list vol

   These commands will select the beginning disk of your computer and the listing all the partitions available on that disk.

6. Check for the book item that has the Fs cavalcade FAT32. The EFI partition must be formatted under FAT32. If the volume number of EFI partitioning is "two", type the post-obit control:

   sel vol 2

   If the book number is different than 2, replace "2" with the number available on your reckoner.

7. Assign a letter of the alphabet to this partition, a letter that is unlike that those already bachelor on your computer, for example x:\. Type this command to assign the letter of the alphabet:

   assign letter=ten:

8. Await for the success bulletin to appear:

   DiskPart successfully assigned the drive letter or mountain point.

9. Type exit to quit the DiskPart utility:

   leave

10. Type this command and supersede x:\ with the letter you assigned earlier to the EFI division:

    cd /d x:\EFI\Microsoft\Boot\

11. Then blazon the bootrec command to repair the volume:

    bootrec /fixboot

12. At present you demand to backup the old BCD and recreate a new one. Type:

    ren BCD BCD.fill-in

13. Blazon this command to recreate the BCD and supplant the ten:\ with the assigned letter earlier:

    bcdboot c:\Windows /l en-us /southward 10: /f ALL

14. In in a higher place command, Windows is installed on c:\. If the drive alphabetic character where your Windows eight/8.ane is installed is different, replace c:\ with your drive letter of the alphabet.
15. Remove the DVD from the disk tray
16. Type leave
17. Restart your reckoner

Windows 8 bootrec utility results screen

Fix the MBR in Windows 10

You need the original Windows ten installation DVD to repair the Master boot record.

If you don't take the Windows 10 installation DVD to run Command Prompt, become to Fix MBR with Piece of cake Recovery Essentials.

The instructions are:

1. Boot from the original installation DVD (or the recovery USB)
2. At the Welcome screen, click Repair your computer
3. Choose Troubleshoot
4. Choose Command Prompt
5. When the Command Prompt loads, type the following commands:

   bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd

   

   Windows 10 Repair Your Estimator Carte du jour

6. Press Enter afterward each control and await for each operation to finish
7. Remove the DVD from the disk tray
8. Type exit
9. Hit Enter
10. Restart your computer and check if Windows 10 can at present boot

If bootrec utility doesn't fix your Windows x installation, endeavor following the next commands to prepare the EFI bootloader:

1. Kicking from the installation DVD or the Windows 10 setup or recovery USB
2. Click Repair your figurer
3. Choose Troubleshoot
4. Choose Command Prompt
5. Type these commands in order and striking Enter later each:

   diskpart sel disk 0 list vol

   These commands volition select the first deejay of your computer and the listing all the partitions available on that deejay.

6. Check for the volume item that has the Fs column FAT32. The EFI partition must be formatted under FAT32. If the volume number of EFI partition is "2", type the following command:

   sel vol 2

   If the book number is different than 2, replace "ii" with the number available on your computer.

7. Assign a letter to this partition, a letter that is different that those already available on your computer, for example x:\. Type this command to assign the alphabetic character:

   assign letter=x:

8. Wait for the success message to appear:

   DiskPart successfully assigned the drive letter or mountain signal.

9. Type go out to quit the DiskPart utility:

   exit

10. Type this command and supervene upon x:\ with the letter of the alphabet you assigned earlier to the EFI partition:

    cd /d x:\EFI\Microsoft\Boot\

11. And then type the bootrec control to repair the volume:

    bootrec /fixboot

12. Now yous demand to backup the old BCD and recreate a new one. Type:

    ren BCD BCD.backup

13. Blazon this command to recreate the BCD and supercede the 10:\ with the assigned letter earlier:

    bcdboot c:\Windows /fifty en-us /due south x: /f ALL

14. In to a higher place command, Windows is installed on c:\. If the drive letter where you have Windows 10 installed is unlike, replace c:\ with your drive letter.
15. Remove the DVD from the disk tray
16. Type exit
17. Restart your computer

Windows ten bootrec utility results screen

More Information

Support Links

• Like shooting fish in a barrel Recovery Essentials for Windows – our repair and recovery deejay.

  It's an like shooting fish in a barrel-to-use and automated diagnostics disk. Information technology's available for Windows viii, Windows 7 and Windows Vista. It'south as well available for Windows XP and Windows Server.

  Read more than at Windows Recovery Disks.

• The NeoSmart Support Forums, member-to-fellow member technical support and troubleshooting.
• Get a discounted price on replacement setup and installation discs: Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Windows 11.

Applicable Systems

This Windows-related knowledgebase article applies to the post-obit operating systems:

• Windows XP (all editions)
• Windows Vista (all editions)
• Windows 7 (all editions)
• Windows 8 (all editions)
• Windows 8.1 (all editions)
• Windows 10 (all editions)
• Windows 11 (all editions)

Advise an edit

nixwiliat.blogspot.com

Source: https://neosmart.net/wiki/fix-mbr/

Share this post