I'm pretty new to this, so bear with me. I got a new computer a few weeks ago and and having fun playing with my first DVD burner. I have been using DVDShrink and Memorex DVD+R 8x media for a few weeks, and burned about 40 backup movies without any problems. All of a sudden, I've made 6 coasters in my last 10 tries. I'm not getting an error message on my computer, but when I put the disk in a stand alone player, it says "No Disk." Since I'm not getting any error message from Shrink, could I have a problem with my burner, or is it most likely the poor media I'm using? Thanks in advance.