First OptiNAND-based WD HDDs go on sale. 20 TB without SMR - HWCooling.net
Seagate IronWolf Pro 20TB NAS HDD Review - StorageReview.com
Amazon.com: Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGX : Electronics
Seagate launches 20TB hard disk drives for enterprises and data freaks | VentureBeat
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