By default, 4 sectors of PhysicalVolume are scanned for an LVM
      label, starting at sector 0. This parameter allows you to specify a
      different starting sector for the scan and is useful for recovery
      situations. For example, suppose the partition table is corrupted or lost
      on /dev/sda, but you suspect there was an LVM partition at approximately
      100 MB. This area of the disk may be scanned by using the
      --labelsector parameter with a value of 204800 (100 * 1024 * 1024 /
      512 = 204800):
    pvck --labelsector 204800 /dev/sda
    Note that a script can be used with --labelsector to
        automate the process of finding LVM labels.