On 02 Dec 2017, Rene Lamontagne wrote in
alt.windows7.general:

I suppose that different brands of media could account for
different results.

I don't think that has much to do with it. I've used many different
brands of CDR/DVDRs, from the cheapest crap to some supposedly
"premium" brands. Crummy disks seems to burn equally badly whether
burned slow or fast. Good disks burn well whether burned fast or slow.
I suppose "good" disks have a longer life, but so far most of even my
cheapo disks from long ago are still readable.

Of course, some disks are garbage no matter what. But I know that
immediately when they fail verification. I think the most important
factor is a good writer drive. And they have a limited lifespan. They
always, after maybe 3 years or so of heavy use, start being more picky
about the media, and are more quick to fail verifications and
complaining about burning errors. They often start to have difficulty
recognizing certain types of media. That's when I replace them. The new
one inevitably starts working fine again. Optical burners are
consumables, just like the disks themselves.