Western Digital RE 3TB. Hard drive capacity: 3000 GB, Hard drive interface: SAS, Hard drive speed: 7200 RPM. Power consumption (read): 11.2 W, Power consumption (write): 10.9 W, Power consumption (idle): 9.2 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). Interface: SAS, Data transfer rate: 6 Gbit/s, Compliance industry standards: RoHS