loop recording will create files at the designated size sequentially until the card is near full and then it will delete the oldest file* to make way for the next, (FIFO, first in, first out)
turning loop off will fill the card without defined segments** until the card fills up and then it will stop recording
* recordings that are saved, either manually or by G-Sensor trigger do not get overwritten during this process
** file size limitations will dictate how large each file will be but generally at less than 4gb it will need to start a new recording, some cams will stop at this point, some will just create another large file, varies by product