Dv and mov format specs

As far as I can tell the .dv and the .mov formats are identical as far as audio and picture dimensions and streaming rates and the 48k stereo sound.
Why is the one (.mov) twice the size on disk as the .dv file??? I cannot see any difference in the quality of the playback results, even at full screen, and both iDVD and Toast 7 accept either format.
Second question: why must I use the "Export" command in Quicktime Pro to get it to save the current file as a .dv stream??? This is a real nuisance. Why does QT Pro automatically assume we want to convert a dv file to mov every time????

Here read this:
http://en.wikipedia.org/wiki/QuickTime
and this...
http://en.wikipedia.org/wiki/Dv

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