This just started - and I have been burning discs for a couple years now. The first blank DVD inserted into the burner seems to go through the motions, then the mesg on the monitor says "insert blank DVD to continue... (recording ? I can't remember). This happened the last three times. The first disc has nothing on it, load into player, "unknown disc", 2nd disc seems perfectly fine. But it is using two discs every time I want to burn a back up copy, instead of only one disc. Any clues anyone? Thank you.