What is a G-Sensor?
The G-Sensor or accelerometer can be found in many devices such as your smart phone, vehicle or your dash cam. It will measure the movement (G-Force) of your vehicle through 3 axis; up and down, left and right, forwards and backwards.
How does it work?
The G-Sensor is triggered whenever it detects a sudden change in direction. This could be caused by impact from a car accident, a hit-and-run, hard braking or even when movement is detected when stationary. This is a handy feature if you want to ensure retrieval of footage later on.
When the G-Sensor is triggered, the file it is currently recording on will automatically "lock" and be protected from being modified and deleted. How the file will be protected will vary among brands. But in general, the file will either be locked by making the file a "read only" or placed in a separate folder.
In some brands, the G-Sensor sensitivity can be adjusted. By adjusting the sensitivity, you can eliminate file protection from unwanted movement such as going over a speed bump.