As long as you don't fill the disk with DashCam recordings, the car will automatically delete the oldest Sentry Mode clips (this is a new-ish feature). Before, one had to manually clean up the USB stick every so often. Also, in the event you do run out of space, there is now a handy format button. Note, it will delete EVERYTHING from the stick, but it's a quick way to cleanup DashCam recordings.