Designed, engineered, integrated, and assembled in the United States to satisfy the requirements of demanding security concerned professionals and governments, the Commander line can support a Solid State Drive "SSD" or a fast SATA high-capacity 3.5" hard drive, and has a uniquely stylish and ruggedized design that will complement any desktop. With its built-in power supply and fan-less and quiet operation, the Commander can be easily moved from one desktop environment to another using the provided carrying case. TThe Commander external hard drives deliver extraordinary performance, rapid file transfer speeds (up to 5,000 Mbits/s), and proven reliability for both Mac and PC users. Commander 3F an exclusive shock-absorbing mechanism is built into the enclosure. Its function is to keep the hard drive suspended within the casing, while dissipating the heat produced by the hard drive. The Commander line is designed this way to allow peak performance while operating at an optimal temperature.The built-in power supply offers the user added convenience by eliminating the need to carry nonstandard and sometimes hefty adapters and cables that are normally required to power typical hard drives. The power supply contained in the Commander line is auto-switchable 240 VA/100 VA and uses any standard computer cable, no matter what country you are in. In addition, due to the heat dissipating automatically through the enclosure, there is no fan installed, which makes the device virtually silent while it is operating.