Famous Western Digital, designed for NAS (Network Attached Storage) systems and surveillance cameras (large size and high stability for continuous 24/7 operation). Specifications: Brand: Western Digital (WD) Series: WD Red (specifically designed for NAS devices and surveillance systems) Capacity: 4 Terabytes (4TB) Speed and Interface: SATA 6Gb/s Technology: NASware 3.0 for improved compatibility and reliable performance. The hard drive is new, I bought it for my computer and it turned out to be not what I intended. Price is final and non-negotiable.