only MBR-only boot block operations possible; invalid GPT

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

    Explanation: Consider requesting an MBR-only boot block
    initialization.

    User Action: This message is typically a secondary error and
    associated with a primary error message. This message is intended
    to provide additional information useful in one potential
    resolution for the primary error.