public function save($id, $data, $ttl = 60, $raw = FALSE)
	{
		$contents = array(
			'time'		=> time(),
			'ttl'		=> $ttl,
			'data'		=> $data
		);

		if (write_file($this->_cache_path.$id, serialize($contents)))
		{
			chmod($this->_cache_path.$id, 0640);
			return TRUE;
		}

		return FALSE;
	}