grub: parttool

 
 16.3.54 parttool
 ----------------
 
  -- Command: parttool partition commands
      Make various modifications to partition table entries.
 
      Each COMMAND is either a boolean option, in which case it must be
      followed with '+' or '-' (with no intervening space) to enable or
      disable that option, or else it takes a value in the form
      'COMMAND=VALUE'.
 
      Currently, 'parttool' is only useful on DOS partition tables (also
      known as Master Boot Record, or MBR). On these partition tables,
      the following commands are available:
 
      'boot' (boolean)
           When enabled, this makes the selected partition be the active
           (bootable) partition on its disk, clearing the active flag on
           all other partitions.  This command is limited to _primary_
           partitions.
 
      'type' (value)
           Change the type of an existing partition.  The value must be a
           number in the range 0-0xFF (prefix with '0x' to enter it in
           hexadecimal).
 
      'hidden' (boolean)
           When enabled, this hides the selected partition by setting the
           "hidden" bit in its partition type code; when disabled,
           unhides the selected partition by clearing this bit.  This is
           useful only when booting DOS or Windows and multiple primary
           FAT partitions exist in one disk.  See also ⇒
           DOS/Windows.