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windows:windows10:uefi_boot [2020/09/18 11:53] – created niziakwindows:windows10:uefi_boot [2026/02/03 10:39] (current) – niziak
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 Convert Windows 10 installation to boot from UEFI partition. Convert Windows 10 installation to boot from UEFI partition.
  
 +  * Run Windows and start command prompt
 +OR
   * Boot from Windows 10 ISO    * Boot from Windows 10 ISO 
-  * Select ''Repeair PC'' +  * Select ''Repair PC'' 
-  * Select ''Command Prompt'' +  * Select ''Command Prompt'' or press ''SHIFT+F10'' to spawn command prompt. 
-  * + 
 +With command prompt: 
 + 
 +<code shell> 
 +mbr2gpt /validate /allowFullOS 
 + 
 +disk layout failed for disk 0 
 +</code> 
 + 
 +It means that there is no space for EFI parition or MBR disk contains already 4 partitions. 
 + 
 +The common cause is that Windows creates more recovery partitions if default is too small (created as first and cannot be expanded later). 
 +So probably one used is the recovery partition just after system or data partition. In this combination Windows can expand recovery partition if needed by shrinking data partition. More info here: [[https://www.tenforums.com/windows-insider/144556-windows-10-version-20h1-brings-important-change-windows-setup.html|Windows 10 Version 20H1 brings an important change in Windows Setup ]] 
 + 
 +To detect which recovery is used: 
 + 
 +<code shell> 
 +diskpart 
 +list disk 
 +select disk 0 
 +detail disk 
 +  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info 
 +  ----------  ---  -----------  -----  ----------  -------  ---------  -------- 
 +  Volume 1         Zastrzeżone  NTFS   Partition    500 MB  Healthy    System 
 +  Volume 2     C                NTFS   Partition     72 GB  Healthy    Boot 
 +  Volume 3         Windows RE   NTFS   Partition    864 MB  Healthy    Hidden 
 +  Volume 4                      NTFS   Partition    526 MB  Healthy    Hidden 
 + 
 +select partition 4 
 +delete partition override 
 +</code> 
 + 
 +<code shell> 
 +diskpart 
 +list disk 
 +select disk # Note: Select the disk where you want to add the EFI System partition. 
 +list partition 
 +select partition # Note: Select the Windows OS partition (# number) or your data partition. 
 +shrink desired=100 
 +create partition efi size=100 
 +format quick fs=fat32 
 +assign letter=s 
 +list partition 
 +list volume Note: Note the volume letter where the Windows OS is installed. 
 +exit 
 + 
 +bcdboot X:\windows /s S: 
 +bootrec /rebuildbcd 
 +</code>