WD 500GB RE Enterprise Hard Drive SATA III 7200 RPM 64 MB - WD5003ABYZ Industrys highest capacity near line drive - WD RE SATA hard drives are available in capacities ranging from 2 TB to 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. Vibration Protection - Enhanced RAFF technology includes sophisticated electronics to monitor the drive and correct both linear and rotational vibration in real time. Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary.