wiki.iViolet.net

ref:http://woshub.com/software-boot-mirror-gpt-windows/

windows now supports software raid with “storage spaces”, but you cannot do this to your OS drive, only secondary, tertiary, etc drives.

this method allows you to use diskpart to replicate the format and partitions of your OS drive, and create a raid1 mirror with another drive, live in windows, without data loss, just one blank spare disk of the same size.

this assumes your OS is installed in disk 0 and disk 1 is empty. list your partitions to note the size

DISKPART> list part

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
  Partition 1    Recovery           450 MB  1024 KB
  Partition 2    System             100 MB   451 MB
  Partition 3    Reserved            16 MB   551 MB
  Partition 4    Primary            222 GB   567 MB
  Partition 5    Recovery           513 MB   223 GB

erase disk 1

sel disk 1
clean
con gpt

delete the 15mb reserved partition

sel part 1
del part override

create partitions on disk 1 to match disk 0:

Select disk 1
Create partition primary size=450
format quick fs=ntfs label=”WinRE”
set id=”de94bba4-06d1-4d40-a16a-bfd50179d6ac”
create partition efi size=100
create partition msr size=16
Create partition primary size=513 
format quick fs=ntfs label=”WinRE”
set id=”de94bba4-06d1-4d40-a16a-bfd50179d6ac”

convert to dynamic

sel disk 1
con dyn

mirror disk 0 with disk 1:

sel vol c
add disk=1

create GPT mirror for EFI partition

Select disk 1
Select part 2
assign letter=S
format fs=FAT32 quick

select disk 0
select partition 2
assign letter=P
exit

more Bootloader edits:

bcdedit /enum

bcdedit /copy {bootmgr} /d "Windows Boot Manager Cloned"

bcdedit /set {5df8934c-7619-11ec-9533-db70a9132c0a} device partition=s:

P:
bcdedit /export P:\EFI\Microsoft\Boot\BCD2
robocopy p:\ s:\ /e /r:0

Rename s:\EFI\Microsoft\Boot\BCD2 BCD

Del P:\EFI\Microsoft\Boot\BCD2