Purchuse a 50 pack of Memorex DVD+R 8x from BestBuy on sale for $19.00. I had 6 in a row that were coasters. So I went out and bought a 3 pack of Maxell DVD+R 4x for a test to see if it was the dvds. Wouldnt you know it? I was able to burn onto the Maxell brand with no problems. I was using a Plextor PX 716A burner, with updated firmware and software.