This week I spent a lot of time in a very cramped cold hide. Luckily I found that the RED's hard drive gets really hot when filming using pre-record. This function continuously records and then deletes a set time period (usually 3-10 seconds). When you hit the record button, it saves the previous time period- a very useful feature when you are waiting for something to happen, in my case, an eagle taking flight. Additionally, because the hard drive is working so hard, the heat from it makes a great little cheek warmer (scroll down)!