Alphanumeric object in the DVD BCD

Discussion in 'Windows 10' started by balubeto, Sep 8, 2015.

  1. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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    #1 balubeto, Sep 8, 2015
    Last edited by a moderator: Apr 20, 2017
    Hi

    After putting the DVD of Windows 10 in a DVD player and executing the command

    Code:
    C:\WINDOWS\system32>bcdedit /store "D:\boot\bcd"
    Windows Boot Manager
    --------------------
    identifier          {bootmgr}
    description             Windows Boot Manager
    locale                  en-US
    inherit                 {globalsettings}
    default                 {default}
    displayorder            {default}
    toolsdisplayorder       {memdiag}
    timeout                 30
    Windows Boot Loader
    -------------------
    identifier          {default}
    device                  ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
    path                    \windows\system32\boot\winload.exe
    description             Windows Setup
    locale                  en-US
    inherit                 {bootloadersettings}
    osdevice                ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
    systemroot              \windows
    bootmenupolicy          Standard
    detecthal               Yes
    winpe                   Yes
    ems                     No
    
    I noticed that the values of the osdevice and device elements end with an alphanumeric object.

    What is this object? There is an alias for this object?

    Thanks

    Bye
     
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  2. Hadron-Curious

    Hadron-Curious MDL Guru

    Jul 4, 2014
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    That is the GUID(globally unique identifier) of your operating system.
     
  3. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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    If I run this command on another computer, this GUID changes?

    Thanks

    Bye
     
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  4. SOCRATE_MMXII

    SOCRATE_MMXII MDL Expert

    Jan 25, 2012
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  5. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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  6. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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    #6 balubeto, Sep 8, 2015
    Last edited by a moderator: Apr 20, 2017
    (OP)
    So, can you explain one thing:

    I copied the contents of the DVD on my hard disk and then I wrote the following commands:

    Code:
    C:\WINDOWS\system32>bcdedit /store "C:\Users\Balubeto\Downloads\DVD\boot\bcd"
    Windows Boot Manager
    --------------------
    identifier              {bootmgr}
    description             Windows Boot Manager
    locale                  en-US
    inherit                 {globalsettings}
    default                 {default}
    displayorder            {default}
    toolsdisplayorder       {memdiag}
    timeout                 30
    Windows Boot Loader
    -------------------
    identifier              {default}
    device                  ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
    path                    \windows\system32\boot\winload.exe
    description             Windows Setup
    locale                  en-US
    inherit                 {bootloadersettings}
    osdevice                ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
    systemroot              \windows
    bootmenupolicy          Standard
    detecthal               Yes
    winpe                   Yes
    ems                     No
    C:\WINDOWS\system32>bcdedit /store "C:\Users\Balubeto\Downloads\DVD\boot\bcd" /set {default} osdevice ramdisk=[boot]\sources\boot.wim,{ramdiskoptions}
    Operazione completata.
    C:\WINDOWS\system32>bcdedit /store "C:\Users\Balubeto\Downloads\DVD\boot\bcd" /set {default} device ramdisk=[boot]\sources\boot.wim,{ramdiskoptions}
    Operazione completata.
    C:\WINDOWS\system32>bcdedit /store "C:\Users\Balubeto\Downloads\DVD\boot\bcd"
    Windows Boot Manager
    --------------------
    identifier              {bootmgr}
    description             Windows Boot Manager
    locale                  en-US
    inherit                 {globalsettings}
    default                 {default}
    displayorder            {default}
    toolsdisplayorder       {memdiag}
    timeout                 30
    Windows Boot Loader
    -------------------
    identifier              {default}
    device                  ramdisk=[boot]\sources\boot.wim,{ramdiskoptions}
    path                    \windows\system32\boot\winload.exe
    description             Windows Setup
    locale                  en-US
    inherit                 {bootloadersettings}
    osdevice                ramdisk=[boot]\sources\boot.wim,{ramdiskoptions}
    systemroot              \windows
    bootmenupolicy          Standard
    detecthal               Yes
    winpe                   Yes
    ems                     No
    C:\WINDOWS\system32>
    
    Why, in the final output, the ramdiskoptions alias is not converted into its alphanumeric code as it is done in the initial output?

    Thanks

    Bye
     
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  7. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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    #9 balubeto, Sep 9, 2015
    Last edited by a moderator: Apr 20, 2017
    (OP)
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  8. agent268

    agent268 MDL Junior Member

    Feb 20, 2012
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    #10 agent268, Sep 10, 2015
    Last edited: Sep 10, 2015
    The GUID used for Device Options/RAMDisk Options, which appears as the label Identifier under the Device Options entry, is unique and is created when the Device Options/RAM Disk Options entry itself is created.

    This item is solely there to allow booting to an offline OS environment like Windows PE or Windows RE that will reside in RAM. This is commonly used by the bootable Windows Setup environment on the Windows Installation media or for. the Windows RE environment that is configured when you install Windows on a device.

    As far as what you should or shouldn't do with it, I would say leave it alone unless you know what you are doing or have a specific need to modify or change it.
     
  9. murphy78

    murphy78 MDL DISM Enthusiast

    Nov 18, 2012
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    #11 murphy78, Sep 10, 2015
    Last edited by a moderator: Apr 20, 2017
    It uses identifiers for certain things, but I'd be surprised if it actually booted by using incorrect identifiers.
    As far as the {7619dcc8-fafe-11d9-b411-000476eba25f} I'm pretty sure that's the one for MS operating systems or some sort of default GUID.
     
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  10. balubeto

    balubeto MDL Senior Member

    Dec 22, 2009
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    #12 balubeto, Sep 10, 2015
    Last edited: Sep 10, 2015
    (OP)
    Then, the {7619dcc8-fafe-11d9-b411-000476eba25f} string always identifies the "Device options" object . Right?

    This also applies to Windows 7/8.x or this string is different?

    Thanks

    Bye
     
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