Problem:

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?

Resolution:

It’s all down to the architecture of the Boot Image selected during the Boot Media creation process (when you run the “Task Sequence Media Wizard“):

o If the Architecture of the Boot Image is “x64” then you will see the “bootmgr.efi” file and the “EFI” directory.
o If the Architecture of the Boot Image is “X86” then you won’t see the “bootmgr.efi” file and the “EFI” directory.

For reference “EFI” is “Extensible Firmware Interface” that defines the software interface between the firmware and operation system and is a replacement for BIOS firmware. It’s now known as “Unified Extensible Firmware Interface” (UEFI).

More on Wikipedia at:
http://en.wikipedia.org/wiki/Extensible_Firmware_Interface

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