When to toss?

Now that I finally have some understanding of PI/PO peak and average, PI failures, etc., what I don’t know is this:

How far does the original burn quality slide before you toss a burner nowadays?

They’re so cheap as to be not economically repairable, so I don’t know.

Is there some set of cutoff numbers that are “generally accepted”?

If slowing down the drive lets it perform better, how much does that go on before it’s counter productive?

And on overall life expectancy: How many burns do you expect (hope?) to get before deterioration becomes a major consideration?

One speck of dust/lint on the laser lens and quality goes all to hell, why pitch it? Clean it. With the low quality control on blanks now days how do you tell it’s the burner and not the blanks?

Too many factors involved, what about the power supply?

[quote=DaChew;1968377]One speck of dust/lint on the laser lens and quality goes all to hell, why pitch it? Clean it.[/quote] Got a how2 link for me? Does the procedure vary by maker or is it all done with a can of dust-off?

With the low quality control on blanks now days how do you tell it’s the burner and not the blanks?
MCC004 and one drive is doing much less well than the other two in the box. Same media and power supply for all.