Western Digital RE WD4000FYYZ 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive - OEM w/3 Year Warranty Industry's highest capacity nearline drive - WD RE SATA hard drives are available in capacities 4 TB to suit even the most demanding storage needs Highest performance for business-critical applications - WD RE delivers 6 Gb/s transfer rates, sustained sequential data rates of 171 MB/s and high random I/O rates Designed for quality and reliability - With a field-tested 1.2 million hour MTBF, this high performance drive delivers the highest level of reliability for 24x7 operation in up to 100% duty cycle applications Dual processor - Twice the processing power to maximize performance 3 Years Warranty from Reseller