Seagate Barracuda 3TB,Internal,7200 RPM,3.5 inch (ST3000DM001) Hard Drive. It is therefore rather surprising that the HDD, despite a significantly lower power consumption percentage, enables a rich data transfer of brutal 185 megabytes per second . The BarraCuda achieves this dream value with a speed of7,200 rpm . Nevertheless, she remains reserved about volume development.