Been using "fastest possible" for 10 years and never had a problem with even half-decent CDR drives. Perfect checksums.
If you're dumb enough to buy iomega or bargain-basement crap drives, it doesn't matter what speed you burn at, because most of your CDs will be screwed anyway.
BTW, I feel the same way about media. There is a difference with regard to what speed they'll work at, but the cheapest CDRs always performed the best for me back when I was using physical media.
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