Jack Corbett (12/7/2010)
Like most things MS, there are some discrepancies in the documentation which is why I went by a query.
Jack, I suspect that the only sensible way to get a number is as you did it, by a query. MS documentation is sometimes (often?) a bit adrift, or missing detail.
I guess you counted the "reserved" more acurately than I did on Yelena's list, so it gives 171 when those are discounted. Still not sure how Phil's list fits, maybe I should look again.
Thanks for responding to a comment so long after the question was posed - I'm drifting back gradually through old qotd from before I discovered sqlservercentral, and it's pretty rare to see any response to comments on old stuff.