Toshiba MK3276GSX (DMTO3276SA) 2.5" 320GB notebook hard drive is the perfect upgrade or replacement for your laptop computer. The features a fast 5400 RPM motor speed, improving overall system performance and data access times by up to 12 percent (when compared to 4200 RPM drives). This drive uses the Serial ATA (SATA) 3.0Gbps interface and is ATA-8 compliant, supporting high media transfer rates of up to 801 megabytes per second.