def seektime(self, disk):
        """
        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>'}
        """
        args = {
            'disk': disk,
        }

        self._seektime_chk.check(args)

        return self._client.json("disk.seektime", args)