This Western Digital Caviar Green 3TB SATA 3 Desktop Hard Drive will make sure your system has plenty of storage space and that it saves energy. The WD Caviar Green Series is built to work as an eco-friendly hard drive that doesn't waste energy. Using IntelliPower to control spindle speed along with other features like reduced power consumption and improved data tracking makes this WD 3TB SATA 6Gb/s HDD not only a low-power hard drove, but a high-performance hard drive as well. As hard drive capacities increase, the power required to run those drives increases as well. These drives make it possible for energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation. Works for Desktop PC/Mac, CCTV DVR, NAS!