Boot from a VHD using Windows 7

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  1. Posts : 44
    Windows 7 rtm
       #30

    then what can i boot or is it possible to boot xp ?
      My Computer


  2. Posts : 10
    Windows Vista
       #31

    reboots machine when trying to boot from copy


    Well I coppied my Win7Beta.vhd(that boots fine) to GenCode.vhd

    then I tried the above to see if I could boot from my copy, when I do the entire machine reboots before I even see anything.

    The first Win7Beta boots fine still and Vista.

    Any ideas where I may have went wrong


    C:\Windows\system32>bcdedit
    Windows Boot Manager
    --------------------
    identifier {bootmgr}
    device partition=C:
    path \bootmgr
    description Windows Boot Manager
    locale en-US
    inherit {globalsettings}
    default {current}
    resumeobject {ecc68358-0dfb-11de-a1bf-b400729aa187}
    displayorder {ecc68359-0dfb-11de-a1bf-b400729aa187}
    {current}
    {ecc68360-0dfb-11de-a1bf-b400729aa187}
    toolsdisplayorder {memdiag}
    timeout 30
    Windows Boot Loader
    -------------------
    identifier {ecc68359-0dfb-11de-a1bf-b400729aa187}
    device file=[C:]\Win7Beta.vhd
    path \Windows\system32\winload.exe
    description Win7Beta
    locale en-US
    inherit {bootloadersettings}
    recoverysequence {ecc6835a-0dfb-11de-a1bf-b400729aa187}
    recoveryenabled Yes
    osdevice vhd=[C:]\Win7Beta.vhd
    systemroot \Windows
    resumeobject {ecc68358-0dfb-11de-a1bf-b400729aa187}
    nx OptIn
    Windows Boot Loader
    -------------------
    identifier {current}
    device partition=C:
    path \Windows\system32\winload.exe
    description Microsoft Windows Vista
    locale en-US
    inherit {bootloadersettings}
    osdevice partition=C:
    systemroot \Windows
    resumeobject {0dbf36ef-0ae6-11de-80d3-f53a3b2b7793}
    nx OptIn
    Windows Boot Loader
    -------------------
    identifier {ecc68360-0dfb-11de-a1bf-b400729aa187}
    device file=[C:]\GenCode.vhd
    path \Windows\system32\winload.exe
    description GenCode VHD
    locale en-US
    inherit {bootloadersettings}
    recoverysequence {ecc6835a-0dfb-11de-a1bf-b400729aa187}
    recoveryenabled Yes
    osdevice vhd=[C:]\GenCode.vhd
    systemroot \Windows
    resumeobject {ecc68358-0dfb-11de-a1bf-b400729aa187}
    nx OptIn
      My Computer


  3. Posts : 50
    Windows XP and 7
       #32

    gencode said:
    Any ideas where I may have went wrong
    I don't see any error.

    But you can try following step-by-step and reboot after each step:
    Make a backup of your bcd database:
    bcdedit /export "c:\bcd.old"
    Later on you can import it with:
    bcdedit /import "c:\bcd.old"

    1. delete "recoverysequence" and "resumeobject". Perhaps these parameters belongs to your old "Win7Beta.vhd". I don't have them.
    bcdedit /deletevalue {ecc68360-0dfb-11de-a1bf-b400729aa187} recoverysequence
    bcdedit /deletevalue {ecc68360-0dfb-11de-a1bf-b400729aa187} resumeobject

    2. change "device" to "vhd=". In my bcd database "device" AND "osdevice" are identically:
    bcdedit /set {ecc68360-0dfb-11de-a1bf-b400729aa187} device vhd=[C:]\GenCode.vhd

    3. delete "nx OptIn". I don't have it.
    bcdedit /deletevalue {ecc68360-0dfb-11de-a1bf-b400729aa187} nx

    4. delete "inherit". I don't have it.
    bcdedit /deletevalue {ecc68360-0dfb-11de-a1bf-b400729aa187} inherit

    5. delete "recoveryenabled". I don't have it.
    bcdedit /deletevalue {ecc68360-0dfb-11de-a1bf-b400729aa187} recoveryenabled

    6. add "detecthal". I have it.
    bcdedit /set {ecc68360-0dfb-11de-a1bf-b400729aa187} detecthal Yes
      My Computer


  4. Posts : 10
    Windows Vista
       #33

    Its Working now!!


    Well I did get it working, I have normal partition Vista and a Win7 vhd
    When I was running bcdedit I was actually using the Vista sessoin to make the bcdedit /copy to gencode.vhd.

    Thinking that may be the problem I deleted my bcdedit copy entry
    Then I rebooted to Win7 vhd
    cmd out and ran the bcdedit /copy again and all was fine.

    Not 100% sure if it was because I was doing it in the vista partition but anyhow its good now.

    Thanks unawave for the reply, but I already did this about the same time you replied.

    Once again thanks!
      My Computer


  5. Posts : 50
    Windows XP and 7
       #34

    Can you boot to Vista and then post the new created part of bcdedit (part with "GenCode.vhd")?
    I would like to see the differences.
      My Computer


  6. Posts : 10
    Windows Vista
       #35

    Heres the boot section now


    Well here it is, looks pretty much the same, wierd thing is device is pointing somewhere else, the Vista one was like that too but I had changed it to the gencode.vhd jsut to try, but that does not seem to affect it.

    this one was made in Win7

    Windows Boot Loader
    -------------------
    identifier {ecc68361-0dfb-11de-a1bf-b400729aa187}
    device file=[C:]\Win7Beta.vhd
    path \Windows\system32\winload.exe
    description test
    locale en-US
    inherit {bootloadersettings}
    recoverysequence {ecc6835a-0dfb-11de-a1bf-b400729aa187}
    recoveryenabled Yes
    osdevice vhd=[C:]\GenCode.vhd
    systemroot \Windows
    resumeobject {ecc68358-0dfb-11de-a1bf-b400729aa187}
    nx OptIn
      My Computer


  7. Posts : 50
    Windows XP and 7
       #36

    Old, not booting:
    device file= [C:]\GenCode.vhd
    osdevice vhd=[C:]\GenCode.vhd

    New, booting:
    device file= [C:]\Win7Beta.vhd
    osdevice vhd=[C:]\GenCode.vhd

    I donít know why this works. "device" and "osdevice" are different.

    I have something read about "master" and "clone" vhd files.
    That means: You can create several clone vhd files which all based on the same master vhd file. If you than make changes on the master vhd file the clone vhd files are also effected.

    So I don't know if you have a real independent second installation or if you have a second (clone) installation "GenCode.vhd" which based on a master installation "Win7Beta.vhd".


    You can test this:
    • Boot Vista
    • Rename "Win7Beta.vhd" e.g. to "Win7Beta-x.vhd"
    • Reboot (you will get an error, because "Win7Beta.vhd" doesn't exist)
    • Boot "test" (means your "GenCode.vhd")
    Does this work?
      My Computer


  8. Posts : 10
    Windows Vista
       #37

    Hi unawave,

    > You can test this...
    Yes, I changed it and the boot screen said corrupt boot or something, and let me go past that error with only the other 2 items listed.


    Also when I tried to set it to the right
    device file=[C:]\GenCode.vhd

    Then I started to get back to my fisrst issue, where teh system just reboots before I ever see even a windows loading screen.

    ....so, I changed it back to
    device file= [C:]\Win7Beta.vhd
    and all is well again.

    One would think maybe I am just booting the same VHD and donít know it.

    Well thatís not the case cause the c: directories are different and apps installed are different, i.e. I installed fiddler on one and not the other, and 2 directories are on one and not the other.

    It seems to work as is, but its odd.
      My Computer


  9. Posts : 50
    Windows XP and 7
       #38

    It seems I am right and you don't have independent installations.

    But perhaps I am wrong with "master" and "clone". Microsoft called it "parent" and "child".
    See here:
    Frequently Asked Questions: Virtual Hard Disks in Windows 7
    "What happens if the parent VHD of a differencing child changes?"

    Good explanation:
    Innovative Technology Weblog ¬Ľ Native VHD in Windows 7
      My Computer


  10. Posts : 12
    seven
       #39

    hi guys
    just wanted to add my 5 cents hereyou know you can do the boot from vhd thing even if u currently have xp(this way you dont messup your partitions or xp)
    cool stuff
      My Computer


 
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