I'm running into the same problem. I even tried to open the disk with ISO buster and it only shows up empty in XP. I know there's a known issue with DVD +R and -R between Mac and PC's, but even Iso Buster should recognize the two.
I'd be trying a different blank DVD, and burn it no faster than 4x. And make sure you have Mac/PC checked as disk type, and then try again. Also, I always let Toast go through the whole varifcation process after a burn, and then mount it.
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