Best 20 TB Hard Drives
20 TB drives sit at the high end of mainstream capacity, offering maximum density for builds where every bay slot counts. These are almost exclusively helium-sealed enterprise or NAS models, delivering excellent sustained throughput and power efficiency per terabyte. If you are building dense storage (whether a JBOD shelf, a high-capacity NAS, or a Plex archive) 20 TB drives let you pack more usable storage into fewer slots.
Why 20 TB?
20 TB drives deliver roughly 11% more capacity than 18 TB at a modest price premium. But check the per-TB cost carefully, as 18 TB sometimes wins on value. The sweet spot is when 20 TB models are on sale or when bay slots are your limiting factor. Four 20 TB drives in RAID 5 give you ~60 TB usable.
Prices updated daily from Amazon.com. All links go directly to the retailer. Details.
Best Value 20 TB Drives
All new 20 TB hard drives ranked by price per terabyte across brands and product lines.
MDD MAXDIGITALDATA 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal Hard Drive (for NAS, Network Storage) - 5 Years Warranty
BUFFALO Replacement Spare Hard Drive 20TB NAS-Grade for TeraStation 2/4/8 Bay (OP-HD20.0N)
Avolusion PRO-G1 Series 20TB USB 3.2 Gen 2 (10Gbps) USB-C External Hard Drive for Windows or MacOS Desktop PC/Laptop (Silver)
Seagate Skyhawk AI 20TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 512MB Cache for DVR NVR Security Camera System with in-House Rescue Services (ST20000VE003)
Water Panther 20TB 7200 RPM SAS 12Gb/s 3.5-Inch Enterprise Hard Disk Drive in 13G Tray Compatible with Dell PowerEdge Servers R730XD R730 T340 T330 T640 T630 T440
Water Panther 20TB 7200 RPM SAS 12Gb/s 3.5-Inch Enterprise Hard Disk Drive in 14G Tray Compatible with Dell PowerEdge Servers R240 R340 R740XD R550 R750
Seagate Technology ST20000NM002H 20TB Exos X24 HDD 3.5 SATA 7200 ISE Bare Hard Drive
LaCie d2 Professional 20TB External Hard Drive Desktop HDD – USB-C USB 3.1 Gen 2, 7200 RPM Enterprise Class Drives, for Mac and PC Desktop, 1mo Adobe CC All Apps Plan, Rescue Services (STHA20000800)
Enterprise 20 TB Drives
Exos and Ultrastar 20 TB models for datacenter and server workloads. Maximum density with 24/7 endurance ratings.
Seagate Technology ST20000NM002H 20TB Exos X24 HDD 3.5 SATA 7200 ISE Bare Hard Drive
Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive
Western Digital Ultrastar DC HC560 20 TB Hard Drive
WD Ultrastar HC560 WUH722020BLE6L4 20TB 7200RPM 3.5" SE SATA HDD 0F38785
Seagate Exos X20 ST20000NM000D 20 TB Hard Drive - Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage System, Video Surveillance System Device Supported - 7200rpm - 285
Seagate Exos X24 20TB Enterprise Internal Hard Drive HDD - 12GB/s SAS 7200RPM 2.5M MTBF (ST20000NM002H)
NAS 20 TB Drives
IronWolf and WD Red 20 TB models for high-capacity NAS builds. NAS firmware with vibration tolerance and RAID-optimised error recovery.
Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD202KFGX
Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGX
Refurbished 20 TB Drives
Recertified 20 TB enterprise pulls at significant discounts. High-density storage for homelabs, archives, and Plex libraries on a budget.
Avolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (20TB) (Renewed)
Avolusion M5 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Renewed)
MDD (MD20TS25672NAS) 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal Hard Drive (for NAS, Network Storage) - 5 Years Warranty (Renewed)
MDD (MDD20TSATA25672DVR) 20TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)
Avolusion PRO-H1 20TB 7200RPM USB 3.2 Gen2 (10Gbps) External Hard Drive (for Windows or MacOS Desktop PC/Laptop) (Renewed)
Avolusion PRO-X USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop - (20TB) (Renewed)
Avolusion PRO-Z Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (Renewed)
MDD MAXDIGITALDATA MDD 20TB 7200 RPM 256MB Cache 3.5-inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)
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Best Enterprise Hard Drives
Compare enterprise HDD prices for Seagate Exos and WD Ultrastar. Datacenter-grade drives sorted by price per TB for servers and storage arrays.
Best HDD Deals Right Now
Live hard drive deals ranked by price per terabyte. New and refurbished HDDs on Amazon.com. Prices checked daily so you never overpay.