Windows 10: Migrating Multiple Disk Setup from MBR to GPT without data loss? Solved

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  1. Posts : 19
    Windows 10 Professional
    Thread Starter
       14 Sep 2016 #41

    lx07 said: View Post
    Disk 0 looks perfectly fine partition wise. 330GB might be a bit large for C drive - there is nothing wrong with that of course - but unless you have really huge programs you could shrink it to 100GB (for example) and then use the rest for the next partition - it is easier to do this before formatting the unallocated space after C..

    There is one more thing you do need to do and that is to check Windows knows where the recovery partition is. From elevated command prompt check reagentc /info If it says disabled (which it probably will) you'll need to mount partition 1 (on disk 0) and register it.

    in diskpart:

    Select disk 0
    select partition 1
    assign letter = T


    In command prompt: Reagentc /setreimage /path T:\Recovery\WindowsRE /target C:\Windows

    In diskpart: remove

    Then check reagentc /info again.

    This is from here Deploy Windows RE but you don't need to do most of it as the clean install of Windows 10 will have put the WinRE in the (correctly formatted) recovery partition anyway.
    Thanks!

    I run it but... it still says disabled...

    C:\WINDOWS\system32>Reagentc /setreimage /path T:\Recovery\WindowsRE /target C:\Windows
    Directory set to: \\?\GLOBALROOT\device\harddisk0\partition1\Recovery\WindowsRE

    REAGENTC.EXE: Operation Successful.
    ___

    C:\WINDOWS\system32>reagentc /info
    Windows Recovery Environment (Windows RE) and system reset configuration
    Information:

    Windows RE status: Disabled
    Windows RE location:
    Boot Configuration Data (BCD) identifier: 5a109821-18ad-11e6-bc25-dbcdb910dcbf
    Recovery image location:
    Recovery image index: 0
    Custom image location:
    Custom image index: 0

    REAGENTC.EXE: Operation Successful.
      My ComputerSystem Spec

  2.    14 Sep 2016 #42

    lx07 said: View Post
    ah, thanks. I know nothing about that as I have a Mac so I don't have a BIOS at all. Well obviously I do have something but it has exactly zero configurable parameters and just calls whatever is in the EFI partition.
    Impressive then ............ a MAC user helping on a Win10 Forum

    I am all new to UEFI Too got my 1st x99 Board in Feb. so has been a Learning upgrade for sure , can get pretty confusing with UEFI,CSM,MBR and GPT all doing their part to confuse. Windows Boot Manager only shows up in a UEFI Bios after a UEFI Install of Window 10 (or 8) , not if disk is MBR

    KB
      My ComputerSystem Spec

  3.    14 Sep 2016 #43

    adrianArg said: View Post
    Bad boy lol

    I disabled them now just in case, but after everything was working

    Since I don't have any more OS installed it won't do anything, just overkill....

    I have a feeling that if I had changed that to Windows Boot Manager yesterday, it would have worked, even if I did everything with every disk connected....

    But today I followed lx07's instructions bordering on OCD.

    About the MSR partitions, when I clean installed Win 10, I deleted the partition that was created when I converted the disk to GPT (128 MB) as the Windows Setup was bugging me with the "I don't like the partition order" message.... Then it created the 4 partitions and the MSR is not 16 MB...

    I read that it is just reserved space just in case they need it for something OS related at some point, no one is going to die because of 16-128 MB nowadays...
    I don't usually clean the drive beforehand , just do it during the install instead , I didnt realise myself that Diskpart added the 128mb MSR to ALL secondary Drives. However your OS Drive does have the 16mb MSR , I can see it in the Diskpart info Pic.

    KB
      My ComputerSystem Spec

  4.    14 Sep 2016 #44

    adrianArg said: View Post
    Thanks!

    I run it but... it still says disabled...

    C:\WINDOWS\system32>Reagentc /setreimage /path T:\Recovery\WindowsRE /target C:\Windows
    Directory set to: \\?\GLOBALROOT\device\harddisk0\partition1\Recovery\WindowsRE

    REAGENTC.EXE: Operation Successful.
    ___

    C:\WINDOWS\system32>reagentc /info
    Windows Recovery Environment (Windows RE) and system reset configuration
    Information:

    Windows RE status: Disabled
    Windows RE location:
    Boot Configuration Data (BCD) identifier: 5a109821-18ad-11e6-bc25-dbcdb910dcbf
    Recovery image location:
    Recovery image index: 0
    Custom image location:
    Custom image index: 0

    REAGENTC.EXE: Operation Successful.


    You now need to do reagentc /enable if that is as far as you got.......


    KB.
      My ComputerSystem Spec

  5.    14 Sep 2016 #45

    Indeed - I forgot reagentc /enable

    If that doesn't work double check the WinRE.wim is present. You should see this after assigning letter=t:
    Code:
    C:\Windows\System32>dir T:\Recovery\WindowsRE /a
     Volume in drive T is Windows RE tools
     Volume Serial Number is 5446-B5A3
    
     Directory of T:\Recovery\WindowsRE
    
    06/08/2016  17:31    <DIR>          .
    06/08/2016  17:31    <DIR>          ..
    16/07/2016  13:42         3,170,304 boot.sdi
    06/08/2016  17:31             1,057 ReAgent.xml
    06/08/2016  03:41       314,624,214 Winre.wim
                   3 File(s)    317,795,575 bytes
                   2 Dir(s)     190,341,120 bytes free
    
    C:\Windows\System32>
      My ComputerSystem Spec


  6. Posts : 19
    Windows 10 Professional
    Thread Starter
       14 Sep 2016 #46

    Kbird said: View Post
    You now need to do reagentc /enable if that is as far as you got.......
    KB.


    Thank you very much! That did it....

    And regarding the Partition size, yeah, it's huge, I'll look into it, I never finished installing everything... I'm going to leave that unallotacted space be for now, until I get everything running again and see how much I can shrink that, before I start using it...

    You know I now want to install that anniversary upgrade, right?

    Thanks for the help again!

    I don't remember having worked so much to get my computer going since when I was about 10, and I had the brilliant idea to install DOS over Win9x to play a very old game
      My ComputerSystem Spec

  7.    14 Sep 2016 #47

    lx07 said: View Post
    Indeed - I forgot reagentc /enable

    If that doesn't work double check the WinRE.wim is present. You should see this after assigning letter=t:
    Code:
    C:\Windows\System32>dir T:\Recovery\WindowsRE /a
     Volume in drive T is Windows RE tools
     Volume Serial Number is 5446-B5A3
    
     Directory of T:\Recovery\WindowsRE
    
    06/08/2016  17:31    <DIR>          .
    06/08/2016  17:31    <DIR>          ..
    16/07/2016  13:42         3,170,304 boot.sdi
    06/08/2016  17:31             1,057 ReAgent.xml
    06/08/2016  03:41       314,624,214 Winre.wim
                   3 File(s)    317,795,575 bytes
                   2 Dir(s)     190,341,120 bytes free
    
    C:\Windows\System32>

    With MTPW you can just right click the partition and choose Explore , no need for the Drive letter assignment , and in some cases it won't allow access in to the Recovery Folder anyway I have found, which MTPW ignores and opens the Folders.


    KB
      My ComputerSystem Spec


 
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