Seagate 20TB Exos X20 7200 rpm SATA III 6 Gb/s 3.5"
Seagate IronWolf Pro 20TB NAS Hard Drive 7200 RPM 256MB Cache CMR SATA 6.0Gb/s 3.5" Internal HDD NE-ST20000NE000 Desktop Internal Hard Drives - Newegg.com
Western Digital debuts 18TB and 20TB near-MAMR disk drives – Blocks and Files
First OptiNAND-based WD HDDs go on sale. 20 TB without SMR - HWCooling.net