Toshiba MK3276GSX 320GB SATA/300 5400RPM 8MB 2.5" Hard Drive Toshiba MK3276GSX 320 GB SATA/300 5400 RPM 2.5-inch Hard Drive General Features: 320 GB storage capacity 5400 RPM spindle speed Serial ATA interface 8 MB buffer 12 ms average seek time 2 ms track-to-track seek time 5.55 ms average latency 2.5-inch form factor 9.5mm drive height 3 GB/s data transfer rate Vibration and Shock: Operating Vibration 1.0 G with 5-500 Hz