Features: Industry's highest capacity nearline drive - WD RE SAS hard drives are available in capacities ranging from 1TB to 4TB to suit even the most demanding storage needs. Highest performance for business-critical applications - WD RE delivers 6GB/s transfer rates, sustained sequential data rates of 182MB/s and high random I/O rates. Designed for quality and reliability - With a field-tested 1.4 million hour MTBF, this high performance drive delivers the highest level of reliability for 24x7 operation in up to 100% duty cycle applications. Dual port, full duplex connectivity - Offers higher reliability, performance and data availability by eliminating single points of failure, designed for leading business-critical Enterprise topologies. Environmentally conscious - In addition to being RoHS compliant, WD RE is built with halogen-reduced components..