Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: MBR - Restore Windows 7 Master Boot Record


14 Aug 2009   #319
iseeuu

 
 
MBR - Restore Windows 7 Master Boot Record

How to Restore the Windows 7 MBR (Master Boot Record)

...


My System SpecsSystem Spec
05 Nov 2012   #320
azeemtahir

Windows 7 Ultimate x64
 
 
Jeez! Just saved my day!, this one!

On some other forum, I found out someone had a similar issue as I did. Some virus or malware infected the system (as well as Microsoft Security Essentials or Windows Defender - it's on auto update so dont know which is running at the time).

I get a warning that there's an infection, and suddenly, BAM! Blue screen with these words: UNKNOWN HARD ERROR! And that's that. Restarted it, and it would always boot in repair mode.

I said THERE WE GO. Ironic as it is, windows backup or system restore have never worked out for me - EVER. So i knew i'd have to reinstall Windows. Not even auto repair, or the stupid auto recovery disk does anything.

And then I landed here. 4 minute later, I was back on my desktop.

Thanks, Thread starter! You just saved my day!


My System SpecsSystem Spec
05 Nov 2012   #321
iseeuu

 
 

Quote   Quote: Originally Posted by azeemtahir View Post
On some other forum, I found out someone had a similar issue as I did. Some virus or malware infected the system (as well as Microsoft Security Essentials or Windows Defender - it's on auto update so dont know which is running at the time).

I get a warning that there's an infection, and suddenly, BAM! Blue screen with these words: UNKNOWN HARD ERROR! And that's that. Restarted it, and it would always boot in repair mode.

I said THERE WE GO. Ironic as it is, windows backup or system restore have never worked out for me - EVER. So i knew i'd have to reinstall Windows. Not even auto repair, or the stupid auto recovery disk does anything.

And then I landed here. 4 minute later, I was back on my desktop.

Thanks, Thread starter! You just saved my day!
You are most welcome. Thanks for letting us know you found a solution here. Welcome to Windows Seven Forums.

Cheers!
Robert
My System SpecsSystem Spec
28 Nov 2012   #322
RumJungleMusic

Windows 7 Professional 32bit
 
 
Bootsect option

I wanted to 'reverse' an EasyBCD-controlled dualboot (XP Pro, then Windows 7) and use GAG for individual OS booting, 'coz I'm adding another XP for audio editing.
At the start of this thread, Robert (iseeuu) suggested using bootsect to modify the master boot record. I didn't realise this was possible; were you referring to the actual MBR in the first sector of the hard drive, or to the 'master boot sector' in the system volume?
Bye the way, thanks for your detailed, excellent descriptions - a great service!
Chris
PS - any tips on untangling my XP and Windows 7 . . . ?
My System SpecsSystem Spec
28 Nov 2012   #323
iseeuu

 
 

Quote   Quote: Originally Posted by RumJungleMusic View Post
I wanted to 'reverse' an EasyBCD-controlled dualboot (XP Pro, then Windows 7) and use GAG for individual OS booting, 'coz I'm adding another XP for audio editing.
At the start of this thread, Robert (iseeuu) suggested using bootsect to modify the master boot record. I didn't realise this was possible; were you referring to the actual MBR in the first sector of the hard drive, or to the 'master boot sector' in the system volume?
Bye the way, thanks for your detailed, excellent descriptions - a great service!
Chris
PS - any tips on untangling my XP and Windows 7 . . . ?
Hello RumJungleMusic, and welcome to Windows Seven Forums.

As to your first question: I like to think of a hard drive as a room full of file cabinets. You could of course just cut a hole in the ceiling and drop your files into the room from there. But how would you ever find anything. The master boot record tells the computer what kind of filling system is placed on the hard drive, as in the example: how many cabinets, drawers, and files and how and where to find them when the computer boots. Boot loaders like LILO and Grub over write the windows boot loaders in the MBR when they are installed. This tutorial shows how to put the Windows boot loaders back. No other changes are made to the MBR.

It is the boot loader that looks for the partition or volume marked "Active" so it can start the computer. If I understand you, the "Active Flag" is in what you described as the "master boot sector" of the individual partitions or volumes and other than being turned on or off, no changes are made to that sector.

As to your second question: we would have to know how you installed 7 in order to help you "untangle" the two. If you left the XP partition "Active" when you added 7, then most likely Windows 7 put its boot files in the XP partition. If you installed 7 by itself via a default factory install and allowed 7 to create the 100MB "System Reserved" partition to hold the boot files, different steps would be needed. In any case it is not likely that you would need to change the MBR, as you are still only using windows and your choice of new boot loader should place its own correct boot code in the correct place.

I would suggest you create a new thread with your question on how best to separate your current dual boot and include a "Screen Shot" of your Window hard drive map so we can see what you have?

Cheers!
Robert
My System SpecsSystem Spec
.


10 Dec 2012   #324
ax7

Windows 7 64 bit
 
 
Gracias

Wow! Thank you for this. This tutorial saved me.
My System SpecsSystem Spec
27 Dec 2012   #325
alkajak

Windows 7 Ultimate 64bit
 
 

Followed every step.

Target volumes will be updated with BOOTMGR compatible boot code.
The system partition was not found:
The requested system device cannot be found.


Any tips?
My System SpecsSystem Spec
27 Jan 2013   #326
TheRedStorm

Windows 7 Home Premium 64-bit
 
 

THANK YOU!!

This worked perfectly! I was afraid I lost my Windows partition
My System SpecsSystem Spec
03 Feb 2013   #327
mobeen

Windows 7 Ultimate x64
 
 
Windows 7 Ultimate x64 after Restore Windows 7 Master Boot Record

OK i have followed the instructions and i got rid of error no such partition and now everything OK accept i cannot access boot options from windows route msconfig and through pressing f8 advanced boot options please help me
My System SpecsSystem Spec
05 Mar 2013   #328
computercare

All
 
 
HERO.

THANK YOU. Worked perfectly, after all else failed. You are my hero.
My System SpecsSystem Spec
02 Jun 2013   #329
gman0417

home, 64 bit
 
 

When I boot to recovery environment, the folder "boot" which contains the file "bootsect" is not visible in the command prompt. I know it is on the DVD because I can see it from within Windows Explorer. These instructions worked for me in the past but I don't know whats going on now.
My System SpecsSystem Spec
Comment

 MBR - Restore Windows 7 Master Boot Record




Tutorial Tools



Similar help and support threads for2: MBR - Restore Windows 7 Master Boot Record
Windows 7 Tutorial Category
Solved How do I restore the Master Boot Record? General Discussion
Master Boot Record question General Discussion
Windows 7 boot issue with master boot record Installation & Setup
Master Boot Record re-creation Installation & Setup
Master Boot Record (or partial) on seperate HDD Installation & Setup
Master Boot Record needed from one HDD to another Installation & Setup
HDD Master Boot Record (MBR) - How important to delete this? Hardware & Devices

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 01:07 PM.
Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App
  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33