no valid disk signature found

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

    Explanation: A request to preserve existing disk signatures
    has been made, but no existing signatures have been found. New
    signatures have been generated, and any existing EFI console boot
    aliases will have to be recreated or new aliases created. This
    typically indicates there were no existing EFI GPT structures, or
    the structures were found to be corrupted.

    User Action: The requested operation completed and the EFI
    bootstrap structures written to the disk are valud, though there
    are new disk signatures and any existing EFI console boot aliases
    referencing existing signatures could not be preserved. Use the
    EFI console to delete the old boot aliases, and then to add the
    new boot alias associated with the new signature.