Of late I have been having trouble burning disks. I use Fab, nero and shrink but when I burn it comes up Key_Medium_error and aborts before writing the tracks. I use the same media I have been using Sony DVD +R or TDK+R, and while it doesn't happen every time, it seems to be happening more and more. Sorry if this is an easy problem I don't have than much experience with burners. The Liteon burner has been used quite a bit, maybe it needs replaced? Thanks.