The 4TB Deskstar Coolspin 3.5" SATA III Internal Desktop Hard Drive from Hitachi is a sweet upgrade for your desktop computer's hard disk drive. This drive holds a huge capacity of 4TB and fits into your computer's 3.5" drive bay and features a SATA III 6 Gbpsinterface. This drive spins at 5400rpm while also utilizing the innovative CoolSpin technology to deliver a greater level of power efficiency and quiet operation for energy-conscious, environmentally-friendly computers. Key to CoolSpin technology is an optimization of motor speed to provide an ideal balance of performance, power utilization and acoustics. The CoolSpin technology, along with other Hitachi power management techniques, gives the Deskstar Coolspin its 29% power savings over the Deskstar Coolspin. This drive is ideal for environmentally friendly desktop computers as well as home or small office storage servers.