Is the Matshita UJDA720 DVD/CDRW a DVD burner

Is the Matshita UJDA720 DVD/CDRW a DVD burner or just a DVD reader and CD Burner. I was under the impression that it was a DVD Burner also but I cannot use it to burn DVDs. I can play DVDs perfectly and also play and burn CDs perfectly but cannot burn DVDs. I dont have the manual for it.