rebuild-system-part-efi

rem == (Re-)Populate required EFI boot files in SYSTEM partition
rem ==========================================================
rem   This script assumes the following is TRUE:
rem    - Windows is already installed on DISK 0
rem    - SYSTEM partition assigned letter S: and is PART 0
rem    - WINDOWS partition assigned letter C:
rem ==========================================================
rem == 1. Clear existing SYSTEM partition  ======
format S: /q
rem == 2. Add required startup files to new SYSTEM partition  ======
bcdboot C:\windows /s S: /f UEFI
rem == 3. Remove drive letter from SYSTEM partition ======
diskpart
sel disk 0
sel part 0
remove letter=S
rem == 4. Find existing Windows install and build a new BCD
bootrec /rebuildbcd
exit