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: BCD and disc signatures

15 Sep 2009   #1

Windows 7
BCD and disc signatures


I have Windows 2008 R2 installed on C:\. From within Windows 2008 R2 I installed Windows 7 RC on external sata drive (mounted as drive E from diskmanagement) . Dual boot works OK.

Then I disconnect first esata and connect a second one (identical, also drive E). I perform same steps as before to install Windows 7 RTM. Dual boot with this drive works OK.

Problem !!!

If I now connect to my first esata drive again, dual boot does not work anymore. I get :

Windows Failed to start. A recent hardware ...

I did some research and my guess is that it is the signature of the drive that plays havoc with the BCD.

So here are my questions:

- Is my guess OK
- If so how can I modify the drive signature within the BCD store since I do not see any reference in the BCD elements.

Thanks for your feedback.



My System SpecsSystem Spec
15 Sep 2009   #2

XP, Seven, 2008R2

hello, please post the output of bcdedit /enum ALL

Maybe you need to create another boot entry. So you end up with three

Windows Server 2008 R2
Windows 7 RC
Windows 7 RTM
My System SpecsSystem Spec
16 Sep 2009   #3

Windows 7


I eventually got it working. I forgot to mention that I deleted the BCD entry for the first Windows 7 installation, my mistake.

By looking a bit further I found that the BCD elements 11000001 and 21000001 (Device and OSDevice) contains the disk signature.
So I exported the BCD object for the working Windows 7 installation via regedit, I changed the disk signature and the Guid and then imported it back again. Then I needed to add the new entry in the bootmanager bcd object (BCD element 24000001, displayorder)
After this I coukd again use my two Windows 7 installations.

My System SpecsSystem Spec

15 Apr 2010   #4

windows 2008 server

Hi Wilke,
I read your reply and regarding how you managed to fix BCD. I have a situation where I have virtual disk with Windows 2008 R2 Standard edition installed (its a guest OS on Xen). Its a bootable image and everything is working. Now I mount this image as data disk on another windows VM and somehow the disk signature gets modified. Now after un-mounting the image is not booting. The reason behind this is the disk signature of disk and disk signature stored in BCD does not match.
I want to fix this problem, but I don't have a Windows 2008 installation disk to repair the non-bootable image.
How can I read disk signature from BCD? OR How can I write disk signature in BCD? Remember I need to do this from another Windows VM by mounting this non-bootable image (as I don't have a repair CD/DVD/ISO).
Thank you in advance.
My System SpecsSystem Spec

 BCD and disc signatures

Thread Tools

Similar help and support threads
Thread Forum
Hell Guys, If you need signatures or if you have a nice signatures there post here!! :) Btw, I need someone to make a nice signature for me <3 Price : Rep+ hehe
Chillout Room
So, I noticed in the User CP, it says the maximum upload size for a signature is 650 x 100, but I've noticed some people have signatures that are larger. I'm curious as to whether the size policy is strictly enforced, or if it's fairly lenient? Also, I uploaded an image for my signature, but it's...
Chillout Room
I'm not sure if I'm missing something or if I'm just retarded... But how do I get my signature picture to show? All i can get is text to show as a signature... Any help would be appreciated! Thanks! -Raven
Chillout Room

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 22:39.
Twitter Facebook Google+