The Fly6 will loop the recording once the memory card is full. Their site says the included 8 gig card will record about 2 hrs worth of video before it starts overwriting the earliest on the card. As for what happens in an accident, their site says, "...we included an incident protection function where if your bike is tilted over at more than 45 degrees for more than 3 seconds, it will trigger a footage cut off that will stop recording and turn off the device after one hour. With the included 8GB microSD card this would mean you'll have captured and saved roughly the hour before the incident and the hour after (subject to the device still working and having sufficient battery remaining). This protects the most important footage & audio for your use later."