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 hourly from Amazon US and UK. 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.
WD 20TB Elements External Hard Drive, Desktop HDD storage, USB 3.0 compatible, Fast Transfer rates, Plug-and-play storage for all your pictures, videos, music and documents, Black
WD Elements 20TB Desktop USB 3.0 External Hard Drive with the SanDisk Ultra 256GB USB 3.0 Flash Drive
WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN
Seagate Expansion 20TB External Hard Drive HDD - USB 3.0, with Rescue Data Recovery Services (STKP20000400)
Seagate Expansion Desktop 20TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP20000400)
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)
Toshiba N300 20TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWG62AXZSTA
Toshiba N300 internal hard drive 20 TB 7200 RPM 512 MB 3.5" Serial ATA III
Enterprise 20 TB Drives
Exos and Ultrastar 20 TB models for datacenter and server workloads. Maximum density with 24/7 endurance ratings.
Seagate Exos X24 3.5" Internal Hard Drive - 20TB, Single, SATA III 6 Gb/s
Seagate Exos X24 ST20000NM007H - 20TB
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 X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive
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.
WD Red Pro 20TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache
WD Red Pro 20TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6 Gb/s, CMR, 512MB Cache
Seagate IronWolf Pro 20TB, Enterprise Internal NAS HDD, CMR 3.5 Inch, SATA 6GB/s, 7.200 RPM, 256MB Cache for RAID NAS, Rescue Services - Frustration Free Packaging (ST20000NTZ01)
Refurbished 20 TB Drives
Recertified 20 TB enterprise pulls at significant discounts. High-density storage for homelabs, archives, and Plex libraries on a budget.
WD 20TB Elements External Hard Drive, Desktop HDD storage, USB 3.0 compatible, Fast Transfer rates, Plug-and-play storage for all your pictures, videos, music and documents, Black
Seagate Expansion Desktop 20TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP20000400)
WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN
Seagate IronWolf Pro 20TB, Enterprise Internal NAS HDD, CMR 3.5 Inch, SATA 6GB/s, 7.200 RPM, 256MB Cache for RAID NAS, Rescue Services - Frustration Free Packaging (ST20000NTZ01)
Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C
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-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (20TB) (Renewed)
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Best HDD Deals Right Now
Find the best hard drive deals sorted by price per terabyte. Compare new and refurbished HDDs across Amazon US and UK, updated hourly.