Hard Drive, 400GB Sata Int 7200RPM Model: WD4000KD 400 GB storage capacity / Rotational speed: 7200 RPM / Buffer Size: 16 MB / Average latency: 4.20 ms / Read seek time: 8.9 ms Write seek time: 10.9 ms / Interface: SATA 150 MB/s / 3.5-inch form factor