code: def _format_disk_metrics(self, metrics):
          
          for name, raw_val in metrics.iteritems():
              if raw_val:
                  match = DISK_STATS_RE.search(raw_val)
                  if match is None or len(match.groups()) != 2:
                      self.log.warning('Can\'t parse value %s for disk metric %s. Dropping it.' % (raw_val, name))
                      metrics[name] = None
                  val, unit = match.groups()
                  # by default some are uppercased others lowercased. That's error prone.
                  unit = unit.lower()
                  try:
                      val = int(float(val) * UNIT_MAP[unit])
                      metrics[name] = val
                  except KeyError:
                      self.log.error('Unrecognized unit %s for disk metric %s. Dropping it.' % (unit, name))
                      metrics[name] = None
          return metrics
docs: Cast the disk stats to float and convert them to bytes