DESC: This is a 50-pack of hard drives. The 320GB WD Scorpio SATA 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. Utilizing the most technologically advanced material available, the WD Scorpio can perform a minimum of 600,000 load/unload cycles without contamination - up to twice the performance of its competitors. And the Scorpio's rigid stainless steel top cover withstands more than 5 pounds of pressure - nearly 1.5 times the industry average - without pinching vital internal components.