Displays the contents of the default or of the specified sector
    as a Master Boot Record (MBR) structure.

                                   NOTE

       The FAT partition typically mounted with this utility
       does not include a Master Boot Record (MBR) structure. An
       entire OpenVMS I64 system disk will include a Legacy or a
       Protective MBR, however. To display the contents of the
       disk-level bootblock structures, please see the SYS$SETBOOT
       foreign-command interface.

    Format

      SHOW MBR  volume

1  –  Parameter

 volume

    The target FAT volume for the command.

2  –  Qualifiers

2.1    /BLOCK

       /BLOCK=lbn

    The sector to be formatted as a Master Boot Record (MBR). If
    not specified, the default will be the calculated sector for the
    current disk.

3  –  Description

    The SHOW MBR command is a diagnostic, and used to review the
    contents of the disk Master Boot Record for the specified target
    partition or device.

                                   NOTE

       Not immediately useful to users. This command is solely
       intended as a low-level disk diagnostic and debugging tool.

    EFI$CP> show mbr foo:
    Master Boot Record (MBR) not present or not valid; disk is not partitioned
    EFI$CP>