Hitachi Travelstar 5K320 160GB SATA/300 5400RPM 8MB 2.5" Hard Drive Hitachi Travelstar 5K320 HTS543216L9A300 Hard Drive General Features: 160 GB storage capacity Serial ATA/300 interface 8 MB data buffer 5400 RPM rotational speed 5.5 ms average latency 729 Mbits/sec maximum media transfer rate 300 MB/sec maximum interface transfer rate 12 ms average read seek time 1 ms average read track to track time 20 ms full stroke seek time TrueTrack Technology for tracking accuracy in high shock or vibration environments