I've been reading about scans and PI Errors and PI Failures for days and I cannot get any real world appreciation of what these errors and failures mean to me in terms of readability of the burned discs. It escapes me as to how one program can read the disc sufficiently to verify a successful burn and the next program encounters so many errors that it can't even complete a scan. Follow me here and tell me where my logic is failing.
I burn and verify the disc using ImgBurn. I get no errors, see nothing unusual and get a success message at the end. That seems to tell me that ImgBurn was able to read what it just wrote and the read data still agrees with the original file. True? There's no indication of how many attempts were made to read the disc and maybe ImgBurn had to try an exhaustive number of times to read it, but eventually, it was successful without outright failing.
I then run a Transfer Rate Test in DiscSpeed and get what looks like a nice relatively smooth curve. DL discs usually show a slight dimple at the layer break, but there are no real spikes of any size anywhere. That tells me that the drive was able to read the disc at a uniform rate. I guess it's not checking the validity of what it got, but it knows it got something and moved on. Does the TRT have any impact on the quality of the image on the disc? Or is it simplying indicating that the drive recognizes data and can transfer that data, good or bad, at a constant rate?
Then it gets interesting. I move the disc to my (externally connected) BenQ DW1655 and run a Quality Scan. Everything will usually hum along nicely until it gets close to the outer edge of the disc and the fireworks begin.
So how is it that ImgBurn and my Pioneer burner can read the disc and successfully compare its contents with the original image file, yet the BenQ can't even read whatever data is there without reporting errors galore?
I'm not asking how to avoid the problem (I know, I know, buy Verbatim and use a Sharpie but that's kinda like painting your BMW with a 3" paint brush and house paint, isn't it?), but I am trying to understand what it all means.
Thanks for any sense you can bring to this.