https://www.techradar.com/news/western-digital-has-made-a-huge-hdd-breakthrough

Western Digital’s new ePMR drives leverage the company’s OptiNAND technology to unlock higher levels of capacity, performance and data resiliency. For instance, its new 22TB CMR HDD incorporates OptiNAND to deliver areal density on a 2.2TB/platter HelioSeal platform with ten disks.