18TB Hard Drive Deals – Prime Big Deal Days 2026
18TB 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 $39.56/TB here today is the Seagate Enterprise 3.5 7200 RPM 3.5 at $712.00, listed as new. Verdict: near its low. Our lowest recorded price for it is $694.00 on 2026-06-25.
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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| HP/Western Digital Ultrastar DC HC550 WUH721818ALE600 0F38492 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive MB018000GXLAV P37677-001 (Renewed)RenewedHDD · SATA | 18 TB | $488.00 | - | $27.11 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital DC HC550 18TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD - WUH721818ALE604 (0F38453) (Renewed)RenewedHDD · SATA | 18 TB | $529.00 | - | $29.39 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed)RenewedHDD · SATA | 18 TB | $540.00 | $712.00 | $30.00 | Real low | - | CorteseInc26 | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed)RenewedHDD · SATA | 18 TB | $549.99 | $859.45 | $30.56 | Real low | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital 18TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181KRYZ (Renewed)RenewedHDD · SATA | 18 TB | $599.00 | $854.99 | $33.28 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos ST18000NM003C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 18 TB | $539.99 | - | $30.00 | Near its low | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed)RenewedHDD · SATA | 18 TB | $569.00 | $784.45 | $31.61 | Near its low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital 18TB WD Red Pro NAS WD181KFGX 7200 RPM SATA 6 Gb/s CMR 256 MB Cache 3.5" Internal Hard Drive HDD (Renewed)RenewedHDD · SATA | 18 TB | $589.00 | $752.99 | $32.72 | List-price cut | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos X20 18TB 7200 RPM 512e SATA 6Gb/s 3.5" Enterprise Hard Drive - ST18000NM003D (Renewed)RenewedHDD · SATA | 18 TB | $599.99 | $792.00 | $33.33 | List-price cut | - | DBSKY | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Water Panther WP Expanse 18TB 7200 RPM 512e SATA Gen3 3.5-inch HDD | ECC PLP CMR | Enterprise Data Center SAN Hard Disk Drive - WESA5SLC0180D (Renewed)RenewedHDD · SATA | 18 TB | $328.99 | - | $18.28 | No history yetfirst seen 2026-08-25 | - | - | ServerPartDeals | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate (Recertified) Exos X18 18TB Enterprise HDD - CMR 3.5 Inch Hyperscale SATA 6Gb/s, 7200 RPM, 512e and 4Kn FastFormat, Low Latency with Enhanced Caching (ST18000NM000J)RenewedHDD · SATA | 18 TB | $389.99 | - | $21.67 | No history yetfirst seen 2026-07-06 | - | - | MD TECH | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate IronWolf Pro 18TB NAS HDD, ST18000NE000 SATA 6Gb/s 3.5" (Renewed)RenewedHDD · SATA | 18 TB | $519.99 | - | $28.89 | No history yetfirst seen 2026-06-25 | - | - | goHardDrive | Buy on Amazon | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MDD 2018 MDD18TS25672NAS 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive - 5 Years Warranty (Renewed)RenewedHDD · SATA | 18 TB | $539.99 | - | $30.00 | No history yetfirst seen 2026-10-21 | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate Exos ST18000NM002C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 18 TB | $559.99 | $599.99list price | $31.11 | No history yetfirst seen 2026-10-24, Amazon's reference price $599.99 | - | goHardDrive | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WD WD181KRYZ Gold 18 TB Hard Drive - 3.5-inch Internal - SATA (SATA/600) - Server, Storage System Device Supported - 7200rpm (Renewed)RenewedHDD · SATA | 18 TB | $599.00 | - | $33.28 | No history yetfirst seen 2026-10-21 | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Prices we checked and would not pay (5)
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Used
(11)
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 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZUsedHDD · SATA | 18 TB | $459.99 | - | $25.56 | Real low | - | ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital 18TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181KRYZUsedHDD · SATA | 18 TB | $599.00 | - | $33.28 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5 Internal - SATAUsedHDD · SATA | 18 TB | $599.99 | - | $33.33 | Real low | - | Dealforless | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital WD Red Pro Internal Hard Drive 18 TB CMR 3.5 inch SATA 7200 RPM 512MB NAS WD181KFGX-AJP Eco PackageUsedHDD · SATA | 18 TB | $697.00 | - | $38.72 | Real low | - | Tech Original | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Seagate IronWolf 18TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage, Rescue Services – Frustration Free Packaging (ST18000VNZ00)UsedHDD · SATA | 18 TB | $699.99 | - | $38.89 | Real low | - | ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital WD Gold Internal Hard Drive, 18 TB, 3.5 Inches, SATA 7200 RPM, 512 MB Cache, 512 MB, Enterprise, 5 Years Manufacturer's Warranty, Eco Package (Authorized Dealer in Japan)UsedHDD · SATA | 18 TB | $797.00 | - | $44.28 | Real low | - | Tech Original | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Western Digital 18TB Elements Desktop External Hard Drive USB 3.0 for plug-and-play storage - Western DigitalBWLG0180HBK-NESNUsedHDD · USB | 18 TB | $508.94 | - | $28.27 | Near its low | Prime | Amazon Resale | Buy on Amazon | |||||||||||||||||||||||||||||||||||||||||||||||||||
Prices we checked and would not pay (4)
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Is it really a deal?
Recertified X18 stock undercuts new X18 stock by a wide margin, which means the cheapest figure on this page comes from a different table than the headline one. The tables are ranked separately so that gap stays visible.
For the cheapest row on this page we have recorded a low of $694.00 on 2026-06-25, across 16 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 18 TB listing today works out at $26.11/TB.
Renewed and recertified stock at 18 TB starts at $18.28/TB, with the seller rather than the manufacturer behind the warranty.
The cheapest external route to 18 TB is $43.50/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.
18TB is the tier where the three ways of buying the same capacity separate most clearly. New Exos X18 stock, recertified X18 units from data-centre retirement, and the 18TB Elements Desktop external all target the same shelf, and the gap between them is wide enough that the condition column is the most important thing on this page. The recertified route is usually cheapest per terabyte, the external sits in the middle and new internal retail is the most expensive. Each table computes its own ranking so the three never interleave.
Frequently asked questions
Is a recertified 18TB Exos safe to buy?
It is factory-tested stock with a shorter warranty, usually two years from the seller rather than five from Seagate. Read the SMART hours on arrival, scan the surface, and treat it as one copy of your data rather than the only one.
Why is the 18TB external cheaper than the bare internal?
The enclosure is a finished product on an older cost base while bare internal retail absorbed the 2026 increases. If the drive is destined for a NAS, our shuckable page covers which families open to a usable SATA drive.
Exos X18 or IronWolf Pro at this size?
The Exos is a data-centre drive, louder and rated for higher workloads; the IronWolf Pro is tuned for small NAS boxes and comes with recovery services. For a home NAS in a living space the IronWolf Pro is the easier drive to live with.
Does the warranty differ between these three routes?
Substantially. New enterprise stock carries a five-year manufacturer warranty, recertified units typically carry a shorter seller warranty, and an external's warranty covers the enclosure and ends the moment you open it.
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.