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I thought an EFI System Partition that boots Windows (specifically Win10, but I think the concept is the similar for all NT-based Windows) was a unique type of EFI system partition that can only be made using a Windows repair disk and the command line therein. However, I'm getting the feeling I'm being a bit narrow-minded.
Do things work more along the lines of:
- create the EFI System Partition using an arbitrary partitioning software, i.e. a Linux tool, Windows repair disk command-line (diskpart), or self-booting application
and then
- load magical Windows-booting data using the automatic Startup Repair found on a Windows repair disk or using commands with Windows repair disk command-line, i.e. bcdboot?
Here is a page that describes converting a BIOS-booting Windows installation to boot in EFI mode. Also, once everything's working, you can back up the EFI System Partition (ESP) using just about any file-level backup tool (such as
cp
ortar
in Linux,COPY
or zip in Windows, etc.). With the backup in hand, you can restore the files using any convenient tool to create a fresh ESP if the original is damaged. This is a useful precaution on any EFI-bootable computer running any OS. – Rod Smith – 2015-09-29T17:00:26.110