Engineered for maximum speed! WD VelociRaptor combines a SATA 3 Gb/s interface and 16 MB cache, to deliver performance that's up to 35% faster than older models. Designed and manufactured to mission-critical enterprise-class standards to provide enterprise reliability in high duty cycle environments, this drive has the highest available reliability rating on a high capacity SATA drive. State-of-the-art technology packs twice the capacity per disk resulting in 300GB of high-performance storage space in this enterprise-class 2.5" drive. The 2.5" WD VelociRaptor is enclosed in a 3.5" enterprise-class mounting frame with a built-in heat sink that keeps this powerful little drive extra cool when installed in high-performance desktop chassis. Rotary Acceleration Feed Forward (RAFF) optimizes operation and performance when the drives are used in vibration-prone, multi-drive chassis. It parks the recording heads off the disk surface during spin up, spin down and when the drive is off. This ensures the recording head never touches the disk surface, resulting in improved long-term reliability and increased drive protection when the chassis is moved.