Attach this EBS volume to an EC2 instance.

        :type instance_id: str
        :param instance_id: The ID of the EC2 instance to which it will
                            be attached.

        :type device: str
        :param device: The device on the instance through which the
                       volume will be exposed (e.g. /dev/sdh)

        :rtype: bool
        :return: True if successful

def attach(self, instance_id, device):
        """
        Attach this EBS volume to an EC2 instance.

        :type instance_id: str
        :param instance_id: The ID of the EC2 instance to which it will
                            be attached.

        :type device: str
        :param device: The device on the instance through which the
                       volume will be exposed (e.g. /dev/sdh)

        :rtype: bool
        :return: True if successful
        """
        return self.connection.attach_volume(self.id, instance_id, device)