Seagate is planning to release 18 and 20TB HDDs in 2020: Digital Photography Review
Seagate IronWolf Pro ST20000NE000 20TB 7200RPM SATA3 256MB Hard Drive 3.5" HDD 763649169889 | eBay
DELL 20TB HDD SAS ISE 12Gbps 7.2K (161-BBVQ) | dellvmwareshop.com
WD Ultrastar DC HC560 0F38755 20TB Hard Drive 512MB Cache 7200 RPM SATA 6.0Gb/s 512E SE NP3 3.5" Internal HDD (WUH722020ALE6L4) - Newegg.com
Seagate SkyHawk AI 20TB HDD Review - StorageReview.com
Seagate IronWolf Pro ST20000NE000 - Hard drive - 20 TB - internal - 3.5" - SATA 6Gb/s - 7200 rpm - buffer: 256 MB - with 3 years Seagate Rescue Data Recovery | Dell USA
20TB HDD SATA ISE 6Gbps 7.2K 512e 3.5in Hot-plug | Dell USA
Amazon.com: WD Ultrastar DC HC560 WUH722020ALE6L4 20 TB Hard Drive - 3.5 Internal - SATA [SATA/600] - Conventional Magnetic Recording [CMR] Method,Mechanical Hard Disk : Electronics
Seagate 20TB 3.5” SAS3 HDD-A20T-ST20000NM002D Internal Enterprise Hard Drive