Western Digital Raptor Serial ATA drives are designed to deliver enterprise-class specifications with 1.2 million hours MTBF (Mean Time Between Failure), 10,000 RPM, 4.5 milliseconds (ms) average seek time, and a five-year warranty. Combined with a SATA interface, the enterprise-class mechanical and electronics platform of WD Raptor hard drives is designed to meet the 24x7 demands of the enterprise environment. Western Digital's Ultra/150 CQ technology optimizes the sequence of data transfers to the hard drive from the host, providing increased data transfer efficiency, which results in higher performance and throughput for enterprise applications. The issuance and completion of one command may be simultaneous with the data transfer of another command, thus minimizing rotational and drive seek latency. The new WD Raptor drives employ RAFF technology to maintain hard drive performance in high vibration environments through adaptive compensation of the servo system. WD Raptor 74 GB drive utilizes Fluid Dynamic Bearings (FDB) to reduce noise and increase long-term reliability. The WD Raptor is a new class of hard drive that matches SCSI reliability and performance while providing simplified connectivity for less cost than Parallel SCSI drives..