This LaCie product's metal body is ideal for naturally dissipating internal drive heat. Its unique design actually draws heat away from the internal drive toward the external casing. The large surface area of the heat sink casing absorbs internal heat and dissipates it, keeping the drive safe and prolonging its life and reliability.
As a consequence, it is normal that the external casing is warm to the touch. Please make sure that the vent on the back bezel is not obstructed and that there is a natural airflow across the casing.
Heat dissipation is maximized when this LaCie product is in the upright position. When stacking LaCie products, please remember to attach the included rubber feet (if included) on the under side of your drives. This will allow for some airflow between your drives so that the heat dissipation can work effectively. LaCie does not recommend stacking or racking more than three drives on top of each other, especially if these drives are turned on simultaneously.