The 320GB WD Scorpio Blue SATA 3Gb/s Hard Drive delivers superior performance with lower power requirements than other, slower, notebook drives. This lower power consumption yields increased reliability. WD's exclusive WhisperDrive technology make the Scorpio quiet, despite its high spin speed. This drive also features ShockGuard technology, protecting the drive mechanics and platter surfaces from shocks, and DuraStep Ramp, which locks the heads in a secure position away from the disk to provide another layer of protection when the drive is not in use.