EFI$HELP.HLB  —  Error Messages, NOEFISIZ
 unable to determine size for SYS$EFI.SYS file

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

    Explanation: The software is not able to determine the size
    of the SYS$EFI.SYS file, and no size has been provided. This
    condition most commonly arises when the target volume is mounted
    foreign.

    User Action: If using the callable interface with a foreign-
    mounted volume, please specify the size. If using the command
    interface, please remount the target volume native.
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