Know Your Shooting Ratio
Remember that when you start editing a movie, you need to capture much more
media than you will use in the final movie. The ratio between the amount of footage
you begin with and the final duration of the movie is called the shooting ratio. When
you are estimating how much disk space you need for a project, calculate it based on
the total amount of media you plan to capture and use during editing, not the
intended duration of the final movie.
Setting Up Your Editing System