How can I get a burning program like Xfburn to treat the DVDR medium like a 650/700MB CDR to burn audio or other data?

Greetingz!

Are you talking about being able to use the "CD" (that you burned onto a DVD) in a regular CD-ROM drive or car stereo? Because it doesn't quite work that way, CD's and DVD's are physically different media. The "Guiding Track" used to keep the burning laser (and then the reading laser) on-target is much, much, tighter on DVDs than on CDs (something like 5 times closer together).

You can burn an ISO9660 standard *.iso file to a DVD (with joliet or RockRidge Extensions), but you're going to need a DVD drive to read that burn.
As for audio, you could try to find something (DVD audio tools, maybe?) that could burn a "DVD-A" format.

Keep in mind, none of these solutions let you put a burned DVD-R into a regular CD drive.

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The sector format is different too. Audio CD's use a different sector size depending on whether it is data or audio. Thats is why you can store over 800M of PCM data on a CD in audio format, but if you were to burn the files, you'd only fit 700M.

DVD's ONLY use a data format. There is no "Audio" format.

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Well, there is a DVD audio format. I linked to it in my previous post (http://en.wikipedia.org/wiki/DVD-Audio).
However, that's one of those obscure formats that most people will likely never physically see in use. It certainly will NOT work in a run-of-the-mill Audio CD player (such as one found in a car stereo).

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All very informative.

The blocksize itself is fixed at 2352 bytes, but while all this is used to store audio, only 2048 are for the actual data of a data CD and the rest is for error correction.

@soplin: what do you want to achieve in the end? You could burn WMA/MP3 to a DVD in its normal format, and some DVD players can play WMA/MP3 vcdhelp.

It would be interesting, whether there are DVD players which can also play FLAC.

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