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This site has good information about many discs by label: http://www.greatgig.com/quad/dvd-a-list.html

I don't believe there is a std. Yes some discs have a provision to get hi-res from the DVD-V. Also some DVD-A players will only output 48k (some one can select on a menu between 48k or 96k) on a DVD-V track. There are discussions such as this as well...