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Rendering – takes twice the space on HD
It is imperative that you render projects to a drive that has twice the amount of free space because Vegas unfortunately makes two copies of the file. It renders to a temp file and then copies that to the final file. This is why it requires twice the disk space because it does this on the render drive.
This may account for error messages when rendering as you might think you have enough space to create your project render when actually you may not.
Thanks to John Rofrano for this bit of information which I didn’t realize.