Welcome to the CD Freaks Forum.
Most likely your problem is related to the blank DVD Media you used.
Informed knowledgeable Forum Members are fully aware that Memorex DVD Media is absolute garbage Media and avoid using any Memorex DVD Media.
To achieve quality error free results suggest obtaining known proven quality DVD Media such as Verbatim or Taiyo Yuden. Suggest viewing the CD Freaks Blank Media Forum (http://club.cdfreaks.com/forumdisplay.php?f=33) for detailed information on quality DVD Media.
Another thing to check is the Firmware version of your DVD Burner. To ensure quality error free results it is important to ensure that your DVD Burner has the newest most current up to date Firmware available.