There are several tools to edit the BCD store, like bcdedit and Visual BCD Editor.
They are editing the so-called "BCD Store". Where is it located physically?
In filesystem (where)?
On physical harddrive sectors (where)?
On Flash ROM of computer?
Somewhere else (where)?
Where is the BCD file located in the registry?
BIOS-based operating systems. The BCD registry file is located in the \Boot\Bcd directory of the active partition.
EFI–based operating systems. The BCD registry file is located on the EFI system partition.
If you have multiple Windows OS's on a UEFI/GPT system you have only one EFI partition. One BCD Store handles all Windows OS's and it is in the EFI partition. There are separate entries in the BCD Store for every bootable OS.
