20TB Hard Drive Deals – Prime Big Deal Days 2026
20TB Hard Drive listings on Amazon.com, each row judged against its own price history
Prime Big Deal Days has ended, here is what is still at its low.
As an Amazon Associate we earn from qualifying purchases. Prices and availability come from Amazon.com as of the last update and may change.
The lowest $38.35/TB here today is the Toshiba HDWG82AXZSTB Toshiba N300 Pro HDWG82AXZSTB at $766.99, listed as new. Verdict: real low. Our lowest recorded price for it is $766.99 on 2026-10-06.
New
Renewed and refurbished
Ranked separately from new stock. The warranty on these comes from the seller named in each row, not from the manufacturer.
| Product | Capacity | Price | Was | $ / TB | Verdict | 90 days | Prime | Seller | Buy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Seagate Exos ST20000NM004C 20TB 7200RPM 512e SATA 6Gb/s 512MB Cache CMR 3.5-Inch Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 20 TB | $649.99 | - | $32.50 | Real low | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C (Renewed)RenewedHDD · SATA | 20 TB | $973.00 | $1,167.99 | $48.65 | Real low | - | Tech Original | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MDD MAXDIGITALDATA (MD20TSATA25672NAS 20TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal NAS Hard Drive (Renewed)RenewedHDD · SATA | 20 TB | $649.99 | - | $32.50 | Near its low | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos ST20000NM003C 20TB 7200RPM 512e SATA 6Gb/s 512MB Cache CMR 3.5-Inch Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 20 TB | $669.99 | - | $33.50 | No history yetfirst seen 2026-10-20 | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos X24 20TB Enterprise Hard Drive HDD SATA 6Gb/s 512MB Cache 7200 RPM 512e CMR Helium Sealed 3.5in Hard Drive ST20000NM000H (Renewed)RenewedHDD · SATA | 20 TB | $689.99 | - | $34.50 | No history yetfirst seen 2026-10-23 | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive (Renewed)RenewedHDD · SATA | 20 TB | $782.89 | $950.00 | $39.14 | No history yetfirst seen 2026-10-06, Amazon's reference price $950.00 | - | Redefine IT | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Prices we checked and would not pay (6)
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Used
(9)
Used listings carry no retest and usually no warranty. They are never counted toward whether this page is worth indexing.
| Product | Capacity | Price | Was | $ / TB | Verdict | 90 days | Prime | Seller | Buy | ||||||||||||||||||||||||||||||||||||||||
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| Western Digital Ultrastar DC HC560 WUH722020ALE604 0F38761 20TB 7.2K RPM CMR SATA 6Gb/s 512e 3.5in Enterprise HDDUsedHDD · SATA | 20 TB | $630.00 | - | $31.50 | Real low | - | Tech Original | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||
| 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)UsedHDD · SATA | 20 TB | $435.12 | - | $21.76 | No history yetfirst seen 2026-10-22 | - | Prime | Amazon Resale | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||
| Western Digital 20TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD202KRYZUsedHDD · SATA | 20 TB | $809.00 | - | $40.45 | No history yetfirst seen 2026-08-30 | - | - | Tech Original | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||
| 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)UsedHDD · SATA | 20 TB | $835.99 | - | $41.80 | No history yetfirst seen 2026-10-27 | - | Prime | Amazon Resale | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||
| 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 - 285UsedHDD · SATA | 20 TB | $924.54 | - | $46.23 | No history yetfirst seen 2026-07-06 | - | - | TechnoDealsUSA | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||
| 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)UsedHDD · USB | 20 TB | $999.99 | - | $50.00 | No history yetfirst seen 2026-10-15 | - | - | Computer Brain | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||
Prices we checked and would not pay (3)
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Is it really a deal?
The cheapest 20TB route is an enclosure you have to open, and that trade is a warranty decision rather than a price one. The table shows both routes side by side so the gap is explicit.
For the cheapest row on this page we have recorded a low of $766.99 on 2026-10-06, across 13 days of our own checks.
2026 is a shortage year for both hard-drive platters and NAND, and several list prices were raised earlier in the year before being discounted during this event. A percentage off a raised list price is not the same as a low, which is why every row here is compared against what we recorded for that exact item instead.
The cheapest new 20 TB listing today works out at $32.50/TB.
Renewed and recertified stock at 20 TB starts at $28.50/TB, with the seller rather than the manufacturer behind the warranty.
The cheapest external route to 20 TB is $32.82/TB, which you would have to open the enclosure to use as a bare drive.
What the verdicts mean
- Real low
- At or below the lowest price we have recorded for this item.
- Near its low
- Within three percent of the lowest price we have recorded.
- List-price cut
- Cut against Amazon's own reference price, but still above the lowest price we have recorded.
- Not a deal
- Above our 30-day median for this item.
- No history yet
- We have fewer than seven days of our own price checks for this item.
At 20TB the external desktop unit wins outright, and by enough that it changes how you should shop the tier. WD's Elements Desktop and Seagate's Expansion Desktop at this size price well below the bare WD Red Pro and Exos X20 drives that serve the same purpose, which is the sharpest illustration of the 2026 inversion anywhere on the site. If the drive is going into a NAS the question becomes whether you are willing to open an enclosure and give up its warranty in exchange for the lower cost per terabyte.
Frequently asked questions
Why is a 20TB external so much cheaper than a 20TB internal?
Finished external products were priced on earlier cost bases while bare retail internals absorbed the 2026 supply squeeze. The enclosure, power supply and cable now cost less than the markup on the bare drive.
Is shucking a 20TB external worth it?
It is the cheapest path to the capacity, and it ends the enclosure warranty the moment the case is open. Our shuckable page lists which families open cleanly and which use a hardware-encryption bridge that ties the drive to its board.
WD Red Pro or Exos X20 for a NAS?
The Red Pro is quieter and sold for small arrays with a five-year warranty; the X20 is a data-centre drive with higher workload ratings and more noise. Both are conventional recording, so either rebuilds predictably.
Is 20TB the best value capacity right now?
On the external route it is among the strongest tiers in 2026. Compare it against 22TB and 24TB on their own pages, because the cost-per-terabyte curve stays flat through that band rather than rising.
Last updated: 2026-10-31 12:00:46 UTC. As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date indicated on Amazon.com and are subject to change. Any price displayed at the time of purchase will apply. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON SERVICES LLC. THIS CONTENT IS PROVIDED AS IS AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.