Shows information about a memory disk(s) in both DECRAM$RECOVER.DAT
    and MDRECOVER.DAT recovery files. The recovery files are searched
    at boot time for memory disk(s) to restore.
    Format
      SHOW DISK  disk-device
1 – Parameter
 disk-device
    The memory disk(s) that you want to show information about.
2 – Description
    The DECRAM SHOW DISK command shows the following information about
    the specified memory disk. Note that if the disk-device parameter
    is not specified it will return a brief status on all disks in the
    recovery file.
    o  Its disk name; this is the name you specified on the DECRAM
       CREATE DISK command line.
    o  Its capacity in blocks.
    o  Its current volume label (if available).
    o  Local or Shared memory.
    o  Its persist, serve, and writebuffered status.
3 – Examples
    If there is no output from this command it means that there
    was no DECRAM$RECOVER.DAT file, no MDRECOVER.DAT file, or
    they were empty.
    1.DECRAM> SHOW DISK mda0
      From SYS$COMMON:[SYSMGR]MDRECOVER.DAT
      Disk $4$MDA0 Size 110 Label MDA0
           Local memory, persist, serve, writebuffered.
    2.$ decram show disk
      From SYS$COMMON:[SYSMGR]MDRECOVER.DAT
      Disk $4$MDA0 Size 110 Label MDA0
      Disk $4$MDF0 Size 100 Label MDF0MDF0
      Disk $4$MDF1 Size 100 Label MDF1MDF1
      Disk $4$MDF2 Size 100 Label MDF2MDF2
      Disk $99$MDE0 Size 100 Label MDE0