WESTERN 1TB SATA 6Gbs 3.5 HD - WD1000DHTZ Up to 1TB storage capacity Super speed - SATA 6 Gb/s interface and 64 MB cache optimize the 10,000 RPM WD VelociRaptor Rock-solid reliability - Designed and manufactured to workstation standards to deliver stellar reliability in high workload environments. Ultra-cool operation - Consumes less idle power and uses similar active power as the previous generation WD VelociRaptor while offering greater capacity and performance. Rotary Acceleration Feed Forward (RAFF) - Optimizes operation and performance when the drives are used in vibration-prone, multi-drive chassis.