Page 1                                        (last mod. 8/20/87)

     DVHTOOL(1M)                                           DVHTOOL(1M)



     NAME
          dvhtool - command to modify disk volume header information

     SYNOPSIS
          /etc/dvhtool [-p [modify part nblks 1st_blk type] [list] ]
               [-v [add unix_file dvh_file] [creat unix_file dvh_file]
               [delete dvh_file] [list]]
               [-d [modify name value] [list]]

     DESCRIPTION
          Dvhtool allows modification of the disk volume header
          information, a block located at the beginning of all disk
          media. The disk volume header consists of three main parts:
          the device parameters, the partition table, and the volume
          directory.  The volume directory is used to locate such
          things as the boot block and the bad sector table.  The
          partition table describes the logical device partitions.
          The device parameters describe the specifics of a particular
          disk drive.

          Invoked with no arguments, dvhtool allows the user to
          interactively examine and modify the disk volume header.
          The read command reads the volume header from the specified
          device, usually /dev/rip0vol. The vd, pt, and dp commands
          first list their respective portions of the volume header
          and them prompt for modifications.  The write command writes
          the possibly modified volume header to the device.

          Invoked with arguments, dvhtool reads the volume header,
          performs the specified operations, and then writes the
          volume header.  The following describes dvhtool's command
          line arguments.

          The -v flag provides four options for modifying the volume
          directory information in the disk volume header.  The creat
          option allows creation of a volume directory entry with the
          name dvh_file and the contents of unix_file. If an entry
          already exists with the name dvh_file, it is overwritten
          with the new contents.  The add option adds a volume
          directory entry with the name dvh_file and the contents of
          unix_file. Unlike the creat option, the add options will not
          overwrite an existing entry.  The delete option removes the
          entry named dvh_file, if it exists, from the volume
          directory.  The list option lists the current volume
          directory contents.

          The -p flag provides two options for modifying the partition
          table information in the disk volume header.  The modify
          option allows modification of the partition entry number
          specified by part. The number of blocks in the partition,
          the first logical block number in the partition, and the
          partition type are set as specified.  The list option lists



     Page 1                                        (last mod. 8/20/87)

     DVHTOOL(1M)                                           DVHTOOL(1M)



          the current partition table contents.

          The -d flag provides two options for modifying the device
          parameter information in the disk volume header.  The modify
          option sets the name device parameter to the specified
          value. The list option lists the current device parameters.

     SEE ALSO
          dkip(4)

     BUGS
          Only the command line options for manipulating the volume
          directory are currently supported.

     ORIGIN
          MIPS Computer Systems







































     Page 2                                        (last mod. 8/20/87)