Bcdboot query

75 pts.
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Windows Server 2012 R2
I am following the steps for deploying a Windows Server 2012 R2 OS in a system: From CMD:
  1. Diskpart
  2. Select disk 0
  3. Clean
  4. Create part pri size=350
  5. Active
  6. Format quick label=”System Reserved”
  7. Assign letter=C
  8. Create part pri size=102400
  9. Format quick label=System
  10. Assign letter=D
  11. Exit diskpart: Using the wim file image is deployed into D drive.
  12. Bcdboot D:Windows /s C:
After this command the drive letters are changed. 'System Reserved' (350 MB) with no drive letter, C drive (100 GB) and D drive is assigned to DVD-ROM. As per my understanding BCD configuration files are copied to C drive from D drive. Can you please explain what the actual thing is happening when I am using the last? Command (step 12) and how the drive letters are changed. Previous steps are pretty much clear to me.


Software/Hardware used:
windows server 2012 R2
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  • TheRealRaven
    First question you need to answer is why did you run that specific BcdBoot command? The /s option should only be used in circumstances where the drive being configured is intended to be used on a different system.
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  • NeoIndia
    You can omit /s also. I just used it to have some options to use in a different system in future.Nothing else.
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  • TheRealRaven
    I don't understand your comment. It now sounds like you're asking what a different BcdBoot command would do in light of the results you stated in your question.
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  • NeoIndia
    My question is simple.I have seen in few systems using the same line of commands mentioned changes are happening. Changes after the last line of command (step 12) is not clear to me.I just what to know the reason.
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  • TheRealRaven
    The reason is that you used the /s parameter, and that parameter is used only when you want to change the drive designation. That's what documentation is for -- to tell you things like what a parameter does.
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  • NeoIndia
    Due to '/s' command drive letters changed also? Bcz after that command the drive letters are changed. 'System Reserved' (350 MB) with no drive letter, C drive (100 GB) and D drive is assigned to DVD-ROM.
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  • NeoIndia
    Could you please answer my query @TheRealRaven?
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  • TheRealRaven
    The drive letters changed because you told them to change. That's a major purpose of the command. Since that's its purpose, particularly for the /s parameter, it's not clear what you're asking. It looks like you're asking "Why did it do what I told it to do?"

    By reading the documentation for BcdBoot, it should be clear what the command does in that form. There is no answer other than to say that it did what you seem to have told it to do.

    If you actually ran different commands or used different parameters, then please post the exact sequence and ask a question about the different sequence of commands.
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  • Subhendu Sen
    Considering your point no.12, It copies bcd files from the d:\Windows folder to a partition on the HDD that will be booted now and from. The partition on the drive was assigned by you and volume letter is c:. It also helps to repair partition.
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  • NeoIndia
    I have checked Microsoft Technet site about the bcdboot command line. What you (TheRealRaven & Subhendu Sen) are trying say is pretty much clear to me regarding bcd file copy or booting but in the technet site also no where it is mentioned that due to that command the drive letters are changed('System Partition' with C drive letter -> 'Syestem Partition' with no drive letter, 'System' with D drive letter -> 'System' with C drive letter, DVD-ROM with no drive letter -> DVD-ROM with D drive letter) also.
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  • Subhendu Sen
    see here, it can help you to clear your doubts: https://technet.microsoft.com/en-us/library/gg577238.aspx
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  • NeoIndia
    In the current scenario What I understood as per the KB article after that command line,
    'System Reserved' with C drive letter containing BCD information, 'System' with D drive letter containing Windows OS.
    Drive letter should not be changed.
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  • NeoIndia
    Could you please help on that??
    @TheRealRaven, Subhendu Sen
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  • Subhendu Sen
    /s specifies the volume letter of the system partition. The default is the system partition identified by the firmware. Source: MS kb article library. And yes, c drive can not be changed, but other drive letter you can change. However it is not recommended and leave it with their default letter as windows does.
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