?
Solved

LOST C Partition - LIVE server

Posted on 2012-03-11
10
Medium Priority
?
787 Views
Last Modified: 2012-03-17
Hi,
we have a new Hyper-V Virtual Machine running SBS 2011 and discovered serious issues with the OS partition file system.  A chkdsk in read mode shows this:
The first NTFS boot sector is unreadable and corrupt. Reading second NTFS boot sector instead.
Scan finds several index errors.
When restarting the VM to run chkdsk in Fix mode the OS partition is empty. There is nothing to boot from. We restored a previous snapshot so the VM is running for now.
Is there a way to recover from this? Can the OS partition be repaired? This is a live server and currently in use.
 
Any help would be appreciated.

Thank you.

Host OS - Server 2008 R2
0
Comment
Question by:comtechnate
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
10 Comments
 
LVL 12

Expert Comment

by:Navdeep
ID: 37708324
Hi,

Do you have any events related to the error in app/sys logs?

You can try to run low level repair.
Although the article is for win7 however it can be applied to server 2008

http://support.microsoft.com/kb/927392
http://www.petri.co.il/windows-recovery-environment.htm

Regards,
Navdeep [v-2nas]
0
 
LVL 47

Accepted Solution

by:
noxcho earned 1600 total points
ID: 37708641
You can copy a second boot sector to the start of partition. This should fix it.
0
 

Author Comment

by:comtechnate
ID: 37710547
Thank you for the replies.

noxcho, how can I copy a second boot sector to the start of the partition? Is there a tool I can use when in Windows?
Once I restart the VM the Recovery Environment won't recognize a filesystem on the OS partition, so it won't let me switch to it to run any commands.
0
Are your AD admin tools letting you down?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

 
LVL 47

Expert Comment

by:noxcho
ID: 37710770
A trial version of Paragon Drive Backup 10 (server in your case) www.drive-backup.com
Install it on machine - do not restart - start it - right click on system partition - View Edit Sectors. There you can save the last sector and restore it over the sector one.
NTFS always keeps the backup of the first boot sector at the end of partition.
0
 

Author Comment

by:comtechnate
ID: 37715987
I have restarted the server, of course it won't boot now. Disk Management shows the OS Partition as RAW. Drive Backup shows it as Not Formatted - see screenshot (Local disk F:).

Screenshot.pdf

Yet while it says Not Formatted, i can see the file and folder structure and browse some folders.
Any way to recover from this?
0
 
LVL 47

Expert Comment

by:noxcho
ID: 37716139
Did you copy the sector?
Please revert to snapshot and run CHKDSK C: in read only mode.
Then copy and paste the chkdsk output here.
We need to find out the cause of this exactly before we try fixing it.
Also in Drive Backup 10 root directory you can find STUBACT.log file. Upload it here as well.
0
 

Author Comment

by:comtechnate
ID: 37718004
Here is the chkdsk output in read mode and the stubact log file:
chkdsk.pdf
stubact.log

Yes I tried to copy the last sector over the first, but that did not resolve the issue. Had to revert to the snapshot.
Here is the first, last sector plus a disk view.
First-Sector.pdf
Last-Sector.pdf
Disk-View.pdf

As you can see in the disk view the C volume shows as not formatted.

Any advice?



Thank you for your continued assistance
0
 
LVL 47

Expert Comment

by:noxcho
ID: 37718801
First sector is crapped for sure. I am interesting now if you did it copy the right way. How did you replace the first sector? Would be nice if I could have a look on this process remotely.
0
 

Author Comment

by:comtechnate
ID: 37731707
noxcho,
thank you for your help - when trying again I was able to copy the good boot sector ove the corrupted one, run chkdsk to fix file system errors.
Partition looking good again!
0
 
LVL 47

Expert Comment

by:noxcho
ID: 37732533
Glad I could help. Thanks for feedback.
Noxcho
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In 2017, ransomware will become so virulent and widespread that if you aren’t a victim yourself, you will know someone who is.
Learn how the use of a bunch of disparate tools requiring a lot of manual attention led to a series of unfortunate backup events for one company.
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles to another domain controller. Log onto the new domain controller with a user account t…

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question