I am very interested in a scientific definition of velocidensity. Wow me (and everyone else) with the most complex math you can to describe them. I can handle it.

I personally find it odd that a google search of it yields a post almost identical to yours over at reddit.com. One in which the author declares "I'm an expert on these matters, so listen up and listen good - I'll try to keep this simple but it won't be easy, because I am an expert, as I mentioned previously". Aside from poor command of the English language the author of that post also seems to have poor command of any physics or even electrical engineering associated with data storage.
-Nkk, who is eagerly awating your physical definition