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
Seagate Expansion Desktop 20TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP20000400)
WD Elements 20TB Desktop USB 3.0 External Hard Drive with the SanDisk Ultra 256GB USB 3.0 Flash Drive
OSENTRiX BX100 20TB USB 3.2 Gen 2 USB-C External Hard Drive for Windows or MacOS Desktop PC/Laptop
Avolusion PRO-G1 Series 20TB USB 3.2 Gen 2 (10Gbps) USB-C External Hard Drive for Windows or MacOS Desktop PC/Laptop (Silver)
Avolusion PRO-G2 20TB USB 3.2 Gen 2 (10Gbps) USB-C External Hard Drive for Windows/MacOS (Silver)
WD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESN
Toshiba 20TB Enterprise HDD 3.5" SAS 12Gb/s 7200RPM CMR Helium-Sealed 512e Format 512MB Cache -MG10SCA20TE
Enterprise 20 TB Drives
Exos and Ultrastar 20 TB models for datacenter and server workloads. Maximum density with 24/7 endurance ratings.
WD Ultrastar DC HC560 WUH722020ALE6L4 20 TB Hard Drive - 3.5 Internal - SATA [SATA/600] - Conventional Magnetic Recording [CMR] Method,Mechanical Hard Disk
Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive
Seagate Technology Exos X20, 20TB, 3.5-Inch SATA Hard Drive at 6GB/s, 7,200 RPM, 2.5M MTBF, 512e and 4Kn FastFormat, Low Latency with Enhanced Cache (ST20000NM007D), Green
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
WD Ultrastar DC HC560 WUH722020BL5204 20 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS) - 7200rpm - 4Kn Format - 5 Year Warranty
Seagate Exos X24 ST20000NM002H 20 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage Array Device Supported - 7200rpm - Hot Pluggable - 5 Year War
Seagate Exos X20 ST20000NM002D 512E/4KN SAS 12Gb/s 20TB 7200RPM 256MB Enterprise Hard Drive,Mechanical Hard Disk
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.
Seagate IronWolf Pro, NAS Internal Hard Drive 20TB HDD, 3.5 Inch, 7200 rpm, CMR, 256 MB Cache, SATA 6GB/S, Silver, Model No.: ST20000NE000
Seagate IronWolf Pro ST20000NE00 RV sensor 8.9 cm (3.5") NAS 20TB HDD (CMR)
Seagate IronWolf Pro, 20 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST20000NT001)
WD Red Pro 20TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6 Gb/s, CMR, 512MB Cache
WD Red Pro 20TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache
Refurbished 20 TB Drives
Recertified 20 TB enterprise pulls at significant discounts. High-density storage for homelabs, archives, and Plex libraries on a budget.
Seagate Expansion Desktop 20TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP20000400)
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
Western Digital WD Ultrastar DC HC560 WUH722020ALE604 20 TB Hard Drive - 3.5 Internal - SATA - Conventional Magnetic Recording [CMR], Mechanical Hard Disk (Renewed)
Western Digital WD Ultrastar 20TB Internal Hard Drive WD200EDGZ 3.5 Inch HDD SATA 6Gb/s 7200RPM 512MB Cache (Refurbished)
Avolusion PRO-T8 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Black) (Renewed)
Avolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (20TB) (Renewed)
Avolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (20TB White) (Renewed)
Seagate IronWolf Pro ST20000NE00 RV sensor 8.9 cm (3.5") NAS 20TB HDD (CMR)
Related Buying Guides
Best 18 TB Hard Drives
Compare 18 TB hard drive prices sorted by cost per terabyte. Enterprise, NAS, and refurbished 18 TB options from Amazon US and UK.
Best 16 TB Hard Drives
Compare 16 TB hard drive prices sorted by cost per terabyte. Enterprise, NAS, and refurbished 16 TB options from Amazon US and UK.
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 US & UK — prices checked every hour so you never overpay.