Every once in a while, ill burn a cd or a dvd (dvds lately) and when its done, out will pop the dvd and there'll be an unburned "ring" kinda near the middle, not too big but not too small either. One time i burned a dvd and got two "rings". To make a long story short, the dvd/cd didnt work properly and wouldnt copy.
Is there any real explanation for this? =/