Hello, I did a search for this subject but couldnt find anything. I have a BenQ DW1640 drive that has been working great! I have been burning Verb MCC 004's in the drive flawlessly for about 4 months now. Recently, I have noticed that every disk I burn has 2 perfectly circular rings in the burned area of the disk. I understand these are due to write speed changes? The discs still play fine - no freezes, pixelation, etc and they scan fine as well(95-97% using CDSpeed). I have tried both settings for WOPC in Solidburn, never use overburn, but still get the rings. Is this something I should be worried about? A sign my drive is going bad? Any comments or experience with this would be appreciated!