public function remove($id)
    {
        if (!$this->_options['caching']) {
            return true;
        }
        $id = $this->_id($id); // cache id may need prefix
        self::_validateIdOrTag($id);

        $this->_log("Zend_Cache_Core: remove item '{$id}'", 7);
        return $this->_backend->remove($id);
    }