Jun 202011
 

Some windows update that got installed on my VHD-based Windows in week from 2011-06-12 to 2011-06-19 killed possibility to boot from them. Instead of normal startup procedure I was greeted with Repair Windows.

Fortunately I had another Windows installation on same machine so I was able to check boot parameters:

> bcdedit

Windows Boot Manager
--------------------
identifier              {bootmgr}
device                  partition=D:
description             Windows Boot Manager
locale                  en-US
inherit                 {globalsettings}
default                 {current}
resumeobject            {fa179570-87b4-11e0-b0a7-da74dade416b}
displayorder            {current}
                        {fa179565-87b4-11e0-b0a7-da74dade416b}
toolsdisplayorder       {memdiag}
timeout                 1

Windows Boot Loader
-------------------
identifier              {current}
device                  partition=C:
path                    \Windows\system32\winload.exe
description             Windows 7 (x64)
locale                  en-US
inherit                 {bootloadersettings}
recoverysequence        {fa179566-87b4-11e0-b0a7-da74dade416b}
recoveryenabled         Yes
osdevice                partition=C:
systemroot              \Windows
resumeobject            {fa179564-87b4-11e0-b0a7-da74dade416b}
nx                      OptIn

Windows Boot Loader
-------------------
identifier              {aa179565-87b4-11e0-b0a7-da74dade416b}
device                  partition=E:
path                    \Windows\system32\winload.exe
description             My VHD installation
locale                  en-US
inherit                 {bootloadersettings}
recoverysequence        {fa179572-87b4-11e0-b0a7-da74dade416b}
recoveryenabled         Yes
osdevice                partition=E:
systemroot              \Windows
resumeobject            {fa179570-87b4-11e0-b0a7-da74dade416b}
nx                      OptIn

There was my problem – somehow update has changed VHD boot device to nonexistent partition E:.

Solution lies in two commands:

> bcdedit /set "{aa179565-87b4-11e0-b0a7-da74dade416b}" device "vhd=[C:]\VHDs\Windows7.vhd"
The operation completed successfully.

> bcdedit /set "{aa179565-87b4-11e0-b0a7-da74dade416b}" osdevice "vhd=[C:]\VHDs\Windows7.vhd"
The operation completed successfully.

P.S. My best is that one of following updates is the killer:

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