I allways turn the device off by pluging out the power cord - no problems so far (but in the car i only read from the drive and its ext3 formatted). I connect it with a 5V power supply on the cigarette lighter, but you can connect it also directly to 12V. This would allow you to access your device in the car while it is parked before your appartement. You could also connect the webcam to see if you get a ticket :-)). I thinks its not safe to let it in the car, when its very hot or cold.