On Tue, 4 Nov 2008 10:04:44 -0800, "Chris F."
wrote:

I think I've found the problem. I had been using the same batch of DVD-R's
for a couple of years now (a 50-pack goes a long way), so last night I tried
burning the same content onto discs from a different batch. All of them now
worked great. It seems the discs towards the bottom of the first batch are
defective, though I can't figure out why. I was told these Ridata discs are
supposed to be the best.
At least I don't need a new DVD-RW drive....

I'm glad it's sorted out. Blank DVDs vary a lot in quality. I just
had a spindle of Philips DVDs that recorded (and verified) fine, but
the last 20-30 minutes of the disc was unplayable on all but one of my
DVD players. A new spindle of DVDs works fine, and I tired 3
different burners.
Andy Cuffe