Western Digital 74GB 10,000 RPM SATA Raptor Internal Hard Drive 10,000 RPM rotational disk speed and average data seek as fast as 4.5 ms. Exceeds SCSI 10,000 RPM products in workstation benchmarks Enterprise-class throughput includes Western Digital's Ultra/150 Command Queuing technology that optimizes the sequence of data transfers to the hard drive from the host Features a rugged, enterprise-class, mechanical platform with fluid dynamic bearings and high-end actuator Made for years of high-performance operation around the clock. Mean Time Between Failure (MTBF) has been calculated at 1.2 million hours Includes Enterprise Extensions S.M.A.R.T. Accessed (EESA), an expanded command set that provides SCSI-like control for server environments