[ConfigMgr 2007] Why do I see the “bootmgr.efi” file and “EFI” directory on some Boot Media but not others?

I have built two Bootable Media USB keys but the contents are different. On one I see a file called “bootmgr.efi” and a directory called “EFI” yet on the other one these are not present and I’m wondering why? [More…]