FAT volume structure not recognized or not yet implemented

    Facility: EFI$CP, The OpenVMS EFI Partition Control Program

    Explanation: The FAT volume structure that was detected is
    either not a recognized FAT volume structure, or is a FAT volume
    structure that is not yet implemented within this tool.

    User Action: Use a FAT volume structure supported by this tool,
    or formally request an enhancement to the tool.