If you are having a problem with a Cyclic Redundancy error and dirty discs are not your problem..perhaps you have made the same mistake that I did. I purchased a new computer. I was used to the old computer only burning at 2X max so when I burned my discs I was burning onto a DVD with a 2X maximum burn speed while my computer was burning at 8X. This also made it impossible for me to make a copy of a copy because I got the Redundancy Error. I finally realized what I was doing, and changed my burn speed to the maximum speed the disc would allow, well, that solved my problem. For those of you who don't know, you will find the maximum burn speed written on the paper jacket that is wrapped around your DVD's when you buy them. I sure hope this helps someone.