Posts Tagged ‘recovery parition’

  1. Create a system repair disc (http://windows.microsoft.com/en-US/windows7/Create-a-system-repair-disc  ). You can skip this step if you have a Windows installation media. Is a good measure to reboot and verify you can start your system from this disc.
  2. Identify which disk you want to convert (usually is #0). This can be done by looking at the number in the Windows Disk Management.
  3. Download gptgen from here http://sourceforge.net/projects/gptgen  . (You could use the Windows Disk Management Tool for this too. (diskmgmt.msc)) This tool will allow you to convert your MBR disc to GPT with the data included. 
  4. ATTENTION: After this step, your computer CANNOT BOOT until the whole process is completed. DO NOT Shut Down Unless Instructed to! 

    Unzip gptgen and then run CMD with elevated privileges. (replace the 0 with the identified disk number).

    This *will* result in a BSOD shortly after and it’s to be expected:

    gptgen.exe -w \\.\physicaldrive0

  5. Boot using your Windows installation or previously generated system repair disc.
  6. Choose language and preferences, and then select Repair Your Computer -> Troubleshoot -> Advanced options -> Command Prompt
  7. We will need the disk partitioning tool. With this, we will recreate the boot partitions. Type:

    diskpart

  8. Identify the boot disk where Windows is located, typing:

    list disk 

     Something like this should appear:

     

          Disk ###  Status         Size     Free     Dyn  Gpt

          --------  -------------  -------  -------  ---  ---

        * Disk 0    Online          128 GB      0 B        *

  9. Once identified, select the disk (replace with the correct number):

    select disk 0

  10. Verify the partitions:

    list partition

  11. Something similar at the info below should appear.

           Partition ###  Type              Size     Offset

           -------------  ----------------  -------  -------

           Partition 1    Primary            350 MB  1024 KB

           Partition 2    Primary            126 GB   350 MB

  12. Delete the previous system partition:

      select partition 1

      delete partition

  13. Create the new boot partition, Microsoft reserved partition:

      create partition EFI size=100 offset=1

      format quick fs=fat32 label="System"

      assign letter=S

      create partition msr size=128 offset=103424

  14. If you list the partitions again, you should have ended up with something like this:

           Partition ###  Type              Size     Offset

           -------------  ----------------  -------  -------

           Partition 1    System             100 MB  1024 KB

           Partition 2    Reserved           128 MB   101 MB

           Partition 3    Primary            126 GB   229 MB

  15. Ensure that your Windows installation is mounted, replacing 3 with the volume number of the Windows installation (usually 1):

      list volume

      select volume 3

      assign letter=C

  16. Exit diskpart:

      exit

  17. Generate boot partition data, replacing C: with the letter of the Windows installation (usually C:):

      bcdboot c:\windows /s s: /f UEFI

  18. Cross your fingers and then restart your computer!

 

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