Seagate ST8000NM0055 8TB 7200 RPM SATA 6Gb/s 512e 256MB Cache 3.5" Internal Enterprise Hard Drive Advanced Write Caching feature to utilize enhanced algorithms resulting in the industrys highest nearline storage workload performance efficiencies State of the art cache, on the fly error correction algorithms, super parity and end to end SATA based data integrity for accurate data storage Engineered for 24x7 workloads of 550TB per year