So I did a web search.  I found http://www.phantompilots.com/threads/downloading-flight-data-using-a-mac.61756/
about getting .DAT files off the phantom.  The link is for apple it appears.  I would like to see what info is in the dat files but cannot download to my wnfdows 10 PC.  I am doing the following:
1. Start DJI Go app.
2. Advanced settings.
3. Enter flight data mode.
4. I say OK and then get the pop up on my phone that says "Flight data mode entered.  Connect computer to aircraft USB port to view data" and I plug in a USB cable from my PC to the front port on the phantom body.  
Then, nothing.  When I look at a directory of drives on my PC, there is nothing extra, no folder, no USB drive, nothing than what was already there.  Anyone here have any ideas?  Thanks.

Nevermind.

NoneYet Posted at 2017-2-20 19:41
Nevermind.

I found this link on youtube.  I didn't understand what was being explained.  Now I do.