Liteon Dvd Recorders More Than I Hoped... Is It Possible To Retrieve Data Stored/saved From An Unfinalized/defective CD Or DVD?

Is it possible to retrieve data stored/saved from an unfinalized/defective CD or DVD? - liteon dvd recorders more than i hoped...

Location: I appear in the record to a LiteOn DVD burner, and sometimes only the DVD not, even if, as a few minutes before I am able to watch clips. I wonder whether it is possible to recover these clips / data from the disc still worked, before he damaged. I hope someone can answer. Thank you! :)