ive seen this discussed on some other forums. i havent read the article or delved too deep into it but from what i gather it doesnt actually search your hard drive. its just if you install an update that was downloaded automatically by w10 it checks the authentication certificate. at least thats what ive heard people arguing about.
needless to say i always wait a year or two before i upgrade to the latest version of windows. in fact im planning on building a new rig within the next couple months and im fairly sure ill still use windows 7
"The early bird may get the worm, but the second mouse gets the cheese"