WD 0F38459 Ultrastar DC HC550 18TB 3.5" 512e/4Kn SATA 7200RPM Hard Drive, Capacity 18TB, Interface 6Gb/s SATA, Interface Transfer Rate 269MB/s, Spindle Speed 7,200RPM, Cache Buffer 512MB, Average Latency (ms) 4.16, MTBF 2,500,000 Hours, 5 Year Warranty. The breadth and depth of Big Data is driving the universal need for higher capacities across a broad spectrum of applications and workloads. Laying the foundation for a worry-free data center.