Seagate Momentus 5400 320GB 5400RPM SATA 3Gb/s 8MB Cache 2.5 Inch Internal NB Hard Drive ST9320325AS-Bare Drive 5,400 RPM Spin Speed, 8 MB Cache Buffer, SATA 3Gb/s interface with Native Command Queuing,,320 GB Capacity G-Force Protection feature available for added robustness in mobile environments 1000 Gs of nonoperating shock make the drive ideal for notebook PCs and industrial applications. Robust design and high shock tolerance enable mobility in rugged operating environments. Two Year Warranty 5,400 RPM Spin Speed, 8 MB Cache Buffer, SATA 3Gb/s interface with Native Command Queuing,,320 GB Capacity G-Force Protection feature available for added robustness in mobile environments 1000 Gs of nonoperating shock make the drive ideal for notebook PCs and industrial applications. Robust design and high shock tolerance enable mobility in rugged operating environments.