Western Digital WD RE 4TB. Hard drive capacity: 4000 GB, Hard drive interface: Serial ATA III, Hard drive speed: 7200 RPM. Power consumption (read): 9.7 W, Power consumption (write): 9.5 W, Power consumption (idle): 8.6 W. Windows operating systems supported: Windows 7 Home Premium,Windows 7 Home Premium x64,Windows 7 Professional,Windows 7 Professional.... Width: 4" (101.6 mm), Height: 1.03" (26.1 mm), Depth: 5.79" (147 mm). Color of product: Black, Data transfer rate: 6 Gbit/s, Compatible operating systems: Windows 7/8