Seamless Link inactive for DVD burning?



I noticed and I read that when I burn DVDs the Seamless Link activation is not stated and I will have buffer underruns once or twice or many more times when SolidBurn is working. I believe that when I overspeed my media, this buffer underruns cause black spots of the date side of the disc or is it another cause? I have been having black spots for my CMC MAG E01 when I overspeed them and it seems that everything else is all right. Is this true?