Toshiba 4.0TB MD04ACA400 SATA 6.0Gb/s 7200rpm Internal Hard Disk Drive Capacity: 4TB Buffer: 64MB Rotation Speed: 7200RPM, SATA 6.0Gb/s Halogen-free design and power-efficient operation, Low power consumption Perfect for CCTV DVR, PC/Mac, NAS, RAID System, Server Consumer and commercial desktop computers, gaming PCs and external HDDs 3 Years Warranty from Reseller