How much RAM do you have? If you look at the process of DVD copying, you can identify where the weaknesses could lie. It has to read from a DVD, cache it to RAM, and then write it out to another DVD.
So -- the problem could be the DVD its reading from, the read speed, the software its using to read, the amount of RAM it has to cache to, the speed of the RAM it has to cache to, the software it uses to burn the DVD, the burn speed, the DVD drive quality, or the DVD media quality.
The most likely culprits are of course RAM and software. I'd recommend Nero and at LEAST 1GB for nearly flawless burning. That's a nice drive, and the media shouldn't matter too much. And, as the posters above said, always copy it locally first. Then you're removing the step of reading AND writing simultaneously, which takes more RAM. Likewise, if they're on the same IDE ribbon, you'll have competition for who gets to use the ribbon when..
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