disco dotato di un riscontro

09:06 Dec 28, 2010 

I understood that. I was just documenting the probable source of "feedback" as it is what came up when I entered the phrase in the MyMemory site. I believe that this is much simpler than it appears, as is often the case in Italian technical texts and as I'm sure you know.

08:42 Dec 28, 2010 

... this is just what was written in the first draft of the translation (not by me)

08:32 Dec 28, 2010 

I believe that this comes from the MyMemory site, which can be helpful but is not definitive. It seems to be in the wrong category and context as I see it, as per IATE, which has several possibilities. I myself would call it simply a "mark", which is usually what is used for synchronization in mechanical systems. In engines it is called a timing mark on the flywheel.