4TB Enterprise Class SATA HDD. Conquer tough workloads with enterprise-class WD Gold HDDs. Available in 1TB to 14TB capacities, this highly reliable solution for demanding storage environments provides up to 2.5M hours MTBF, vibration protection technology and a low power draw thanks to HelioSeal technology [for 12TB and above]. Specifically designed for use in enterprise-class data centers and storage systems, the WD Gold SATA HDD delivers the world-class performance you expect from Western Digital hard drives. SINGLE PACK