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The smartest way to make multiple copies of a DVD is to select the option to burn the DVD files to a folder on your hard drive rather than directly to a disc.
Once the "burn" is complete, making DVDs is as simple as copying the VIDEO_TS folder you've created to a disc using your computer's DVD burning software. Takes just a few minutes -- as opposed to re-transcoding each time you want another copy of your DVD.
If you use Nero to burn your disc, by the way, make sure it's set to produce a playable rather than data disc.
Authoring a DVD is an intensive process, and requires many resources. There are several issues that can arise:
Heat buildup in the CPU, the HDD's and the RAM can shut down the computer, or lock up programs. A weak, failing or undersized PSU can shut things down, when the load (CPU, HDD's and burner) gets up to its limit.
Programs, like Hibernation, Power Savers, screen savers and devices like "green" HDD's, can shut down intense and protracted operations, as can live AV scanning, live spyware scanning, and even Windows Indexing.
Those are all things to consider,
Thank you very much.