code: def seektime(self, disk):
          
          args = {
              'disk': disk,
          }
  
          self._seektime_chk.check(args)
  
          return self._client.json("disk.seektime", args)
docs: Gives seek latency on disk which is a very good indication to the `type` of the disk.
          it's a very good way to verify if the underlying disk type is SSD or HDD
  
          :param disk: disk path or name (/dev/sda, or sda)
          :return: a dict as follows {'device': '<device-path>', 'elapsed': <seek-time in us', 'type': '<SSD or HDD>'}