How To Repair Mbr From Command Prompt

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Summary

When yous use the Recovery Environment (Windows RE) to troubleshoot startup issues, first try the Startup Repair selection in the Organisation Recovery Options dialog box. If this does not resolve the issue, or if yous accept to manually troubleshoot additional problems, apply the Bootrec.exe tool. This article talks most how to use the Bootrec.exe tool in the Windows RE to troubleshoot and repair the following items in Windows Vista or Windows 7:

• A master kicking record (MBR)

• A boot sector

• A Kicking Configuration Information (BCD) store

You can also use the Bootrec.exe tool to troubleshoot a Windows Boot Configuration Data file is missing required information error.

How to run the Bootrec.exe tool

To run the Bootrec.exe tool, first start the Windows RE:

1. Put the Windows Vista or Windows 7 media in the DVD drive, and and then get-go the reckoner.

2. Press a key when you lot are prompted.

3. Select a language, a time, a currency, a keyboard, or an input method, and then click Next.

4. Click Repair your computer.

5. Select the operating arrangement that you want to repair, then click Next.

6. In the System Recovery Options dialog box, click Command Prompt.

7. Type Bootrec.exe, and and then press Enter.

 Note To start the computer from the Windows Vista or Windows seven DVD, the computer must be configured to start from the DVD drive. For information about how to practise this, run into the documentation that was included with the figurer, or contact the estimator manufacturer.

The Bootrec.exe tool supports the following options. Use the option that's appropriate for your situation.

/FixMbr

This option writes a Windows 7 or Windows Vista-compatible MBR to the system partition. It does non overwrite the existing sectionalisation table. Use this choice when you must resolve MBR abuse issues, or when yous have to remove nonstandard lawmaking from the MBR.

/FixBoot

This selection writes a new kick sector to the system partition by using a boot sector that's compatible with Windows Vista or Windows 7. Utilize this option if one of the post-obit conditions is true:

• The boot sector was replaced with a nonstandard Windows Vista or Windows seven kick sector.

• The kick sector is damaged.

• An earlier Windows operating system was installed after Windows Vista or Windows 7 was installed. In this situation, the figurer starts by using Windows NT Loader (NTLDR) instead of Windows Boot Manager (Bootmgr.exe).

/ScanOs

This option scans all disks for installations that are compatible with Windows Vista or Windows seven. It as well displays the entries that are currently not in the BCD store. Employ this choice when there are Windows Vista or Windows 7 installations that the Boot Manager menu does not listing.

/RebuildBcd

This choice scans all disks for installations that are compatible with Windows Vista or Windows 7. Additionally, it lets y'all select the installations that you desire to add to the BCD store. Use this option when yous must completely rebuild the BCD store.

  Note Use the Bootrec.exe tool to troubleshoot a "Bootmgr Is Missing" error. If rebuilding the BCD store doesn't resolve the startup issue, yous can consign and delete the BCD store and then run this option once more. Past doing this, y'all make sure that the BCD store is completely rebuilt.

To practise this, type the post-obit commands at the Windows RE command prompt:

• bcdedit /export C:\BCD_Backup

• c:

• cd boot

• attrib bcd -s -h -r

• ren c:\kick\bcd bcd.former

• bootrec /RebuildBcd

Need more help?

Source: https://support.microsoft.com/en-us/topic/use-bootrec-exe-in-the-windows-re-to-troubleshoot-startup-issues-902ebb04-daa3-4f90-579f-0fbf51f7dd5d

Posted by: stanfordwithem.blogspot.com

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