mihomes - 7:06 am on Oct 28, 2012 (gmt 0)
I had the same question and was never able to find a definite answer. I even posted on the G forums, but if you have ever gone there its pointless (never anyone from G and mostly bad answers from 'normal' people.
As much as they point out how this is a powerful 'power' tool you think they would have concrete docu on how to use it.
I'm still wondering if you need to add www and non-www IN the disavow text because technically they are different and this is the exact reason we have to verify both for our OWN sites in WMT.
There is still no clear answer on subdomains either other than the mention in the FAQ which I wouldn't call an answer.