I've just had Sentry Mode set up for a day recording to USB, and already I have 150 files! I know there are three different camera angles, so realistically, only 50 "events." Even still, this seems like an excessive amount of video files for just one day. Is there any way to adjust the sensitivity to where it starts recording, like physical contact with the car, or does it just record whenever it senses anything in its proximity? Thanks.