The Momentus 5400.4 is a highly reliable and fast hard drive. The perpendicular magnetic technology used in this Seagate Momentus hard drive increases the areal density of your drive. With a tough, rugged build and high shock tolerance capacity, this Seagate hard drive is ideal for mobile users in rugged notebook operating environments. Work in silence without disturbance as this Seagate Momentus hard drive has Fluid Dynamic Bearing motors for quieter operation. This Seagate hard drive has a SATA 3-Gb/s interface with Native Command Queuing (NCQ) for super fast operation. As the Momentus 5400.4 can handle a non operating shock level of 900 Gs, it becomes ideal for notebook PCs and industrial applications.