This can work both ways. I have copied a lot of CD's onto minidisc. My minidisc recorder doesn't bother recording silence when it drags on for more than about four seconds, so when I play the disc back I just hear the hidden track as if it was a normal one. This can get weird if I tell someone I liked the last track and they think I am talking about a different one. Sometimes it's good to just have a lie down in a quiet place.