I'm new, I bought my first "real" drive and I was testing just for fun. I tried to test one disc few times to see how similar are these tests. I attached 5 images of 5 tests. All of them of the same disc.
I see that results 1, 2 and 3 look almost exactly the same. 4 and 5 are similar to each other, but different than 1,2,3.
4 and 5 didn't reach 16x speed. Why? Why are the first three results different that two other? Why two other were performed with only 8x?