General What's the difference btwn a Hard Reset and a Factory Data Reset?

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http://androidforums.com – Was just about reset my Motion in order to simply start with a clean slate again (unrooted, stock). A general clearing out of sorts instead of going through all the crap apps I've installed in the last year. Backed up all the stuff I needed and was about to reset when I noticed that there are two methods of resetting to factory. One involves the following: How To Hard Reset A LG Motion 4G(MS770) 1. Power off phone. 2. Hold power and Volume down button( Until the phone virbrates). 3. Keep tapping home and back( at the same time). 4. Your either going to see a green robot or a menu scr (General)