Both drives come in the standard 3.5-inch form factor and feature OptiNAND. This technology integrates iNAND Universal Flash Storage (UFS) Embedded Flash Drive (EFD) with traditional spinning disks, packing 20TB onto nine platters (2.2TB/platter). Both drives also make use of Energy-Assisted Magnetic Recording (EAMR), HelioSeal technology to minimize the air drag on the rotating platters, and a triple-stage actuator (TSA). All this comes together to make a drive that has a projected MTBF rating of 2.5 million hours. The Ultrastar DC HC560 is a disk aimed at hyperscale cloud, CSPs, enterprises, or those running big smart video surveillance systems or need high-capacity NAS drives. No pricing was available at the time of writing for the 20TB Ultrastar DC HC560. The WD Gold are hard drives designed with enterprise-grade reliability – ten times that of a standard desktop drive – and is aimed at those with heavy-duty workloads. The 20TB WD Gold retails for $679.99.
