What's the difference between notsave() and notsaved()?

According to the docs the explantion of 'notSave()' is

Triggered when the insert/update operation fails for any reason

and I cannot find any information about 'notSaved()' in docs(but it works )

// phalcon version 1.3.4
Class Model extends \Phalcon\Mvc\Model
{
    public $id ;
    public $name;

    public function notSave(){
        echo "calling notSave()";
    }

    public function notSaved(){
        echo "calling notSaved()";
    }
}

$model = new Model();
$model->id = 1;
$model->save();  // return false and calling notSaved();

Any one who can tell me what is the difference between notSave() and notSaved()? In this case , why model did not triigger notSave()?

Thanks!