invalid x86 System Disk missing MemoryDisk file.

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

    Explanation: x86 system disks must contain a MemoryDisk file:
    SYS$MD.DSK

    User Action: it may be possible to create a new MemoryDisk file
    using SYS$MD.COM but this should be done with guidance from VSI
    Support personel.