Iterable containing disk's partition objects. Objects in the iterable
        are :py:class:`~hwd.storage.Partition` instances.

def partitions(self):
        """
        Iterable containing disk's partition objects. Objects in the iterable
        are :py:class:`~hwd.storage.Partition` instances.
        """
        if not self._partitions:
            self._partitions = [Partition(d, self)
                                for d in self.device.children]
        return self._partitions