If you do a lot of burning and some times things don't work out...If your drive can do RW Blurays pick some of them up!!! Then you can burn a movie and watch it and if something is screwy then you can erase and start over!! Also some times you back up a movie and a month later its playing on all the paid channels well you can erase and put another movie on the disc!! Took me a while to figure out and now its the best thing!!