When starting up the computer, you may receive the following error messages such as: B. "OS not found", "OS failed" or "invalid partition table". These are indications that the MBR (Master Boot Record) on the hard disk is damaged and the computer no longer starts . In this guide, we will show you a step-by-step guide on how to fix hard drive or repair MBR.
Table of contents Hide
2 What are the reasons why the bootloader is corrupted.
3 What error messages do I see when the MBR is corrupted?
4 Repair Windows Master Boot Record: Repair MBR
5 Repair boot manager if MBR is
6 Repair boot manager when is GPT
Why is the MBR corrupted?
A defective or faulty MBR prevents Windows from being able to start. This means that the start information is not readable and is therefore not available.
What are the reasons why the bootloader is corrupted.
What error messages are displayed when the MBR is corrupted?
The corrupt Master Boot Record is dumped from the system drive when Windows tries to access it and fails to boot. If the MBR is defective, the following error messages may appear:
Repair Windows Master Boot Record: Repair MBR
In order to repair and rebuild MBR , we need to find out what partition existing disks have beforehand.
Repair boot manager when MBR is
Repair broken MBR with Windows Command Prompt CDM. (restore mbr without installation cd)
bootrec /fixmbrbootrec /fixbootbootrec /scanosClose the command prompt and restart your computer. This method can fix the master boot code issue .
Repairing the boot manager when it is GPT
If the disk is in GTP partition style, you need to do the following.
diskpartlist vol
sel vol 8Make sure the EFI partition (EPS) uses the FAT32 file system. Select "sel vol 8" the volume.
assign letter=X:To assign a drive letter, enter " assign letter=X: ".
Type exit .
Type the command “ cd /d X:\EFI\Microsoft\Boot\ ” and press “Enter key”. (X is the previously selected drive letter).
cd /d X:\EFI\Microsoft\Boot\Then type “ bootrec /fixboot ” and press the Enter key.
bootrec /fixbootbcdboot C:\windows /l de-de /s X: /f ALLType ren BCD BCD.old
ren BCD BCD.oldPlease restart computer.
With this article, we have introduced a deletion to repair damaged hard disk MBR (Master Boot Record), boot sector or the MBR defect.
The problem can also occur with older Windows versions such as Windows 7, Windows Vista or Windows 10 .
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