18TB Hard Drive Deals – Prime Big Deal Days 2026
18TB Hard Drive listings on Amazon.ca, 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.ca as of the last update and may change.
The lowest CA$49.65/TB here today is the WD HGST 512MB 7200RPM SATA Ultra at CA$893.68, listed as new. Verdict: real low. Our lowest recorded price for it is CA$893.68 on 2026-10-25.
New
Renewed and refurbished
Ranked separately from new stock. The warranty on these comes from the seller named in each row, not from the manufacturer.
| Product | Capacity | Price | Was | CA$ / TB | Verdict | 90 days | Prime | Seller | Buy | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | CA$772.73 | - | CA$42.93 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| HP 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache 3.5in Enterprise Hard Drive for DL20 DL110 DL320 DL325 DL340 DL345 DL360 DL365 DL380 DL385 DL560 ML110 ML350 P37677-001 G11 (Renewed)RenewedHDD · SATA | 18 TB | CA$772.73 | - | CA$42.93 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| WD HGST 18TB 512MB 7200RPM SATA Ultra 512E SE NP Storage DEVIC (Renewed)RenewedHDD · SATA | 18 TB | CA$774.50 | - | CA$43.03 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| HP/Seagate Exos X18 ST18000NM002J 18TB 7200 RPM SATA 6Gb/s 512e 256MB 3.5in Enterprise Hard Drive MB018000GYDKR P44757-005 (Renewed)RenewedHDD · SATA | 18 TB | CA$790.15 | - | CA$43.90 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| Western Digital Ultrastar DC HC550 WUH721818ALE601 0F38452 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 18 TB | CA$853.49 | - | CA$47.42 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| Seagate 18TB HDD Exos X18 7200 RPM SATA 6Gb/s 3.5-Inch CMR Enterprise Hard Drive - ST18000NM000J (Renewed)RenewedHDD · SATA | 18 TB | CA$909.02 | - | CA$50.50 | Real low | - | Redefine IT | Buy on Amazon | |||||||||||||||||||||||||||||||
| Seagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed)RenewedHDD · SATA | 18 TB | CA$909.02 | - | CA$50.50 | Real low | - | Redefine IT | Buy on Amazon | |||||||||||||||||||||||||||||||
| Seagate Exos X20 ST18000NM003D 18TB 7.2K RPM 512e SATA 6Gb/s 3.5in Enterprise Hard Drive (Renewed)RenewedHDD · SATA | 18 TB | CA$944.20 | - | CA$52.46 | Real low | - | Redefine IT | 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 | CA$948.50 | - | CA$52.69 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| WD WD181KRYZ Gold 18 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Server, Storage System Device Supported - 7200rpm (Renewed)RenewedHDD · SATA | 18 TB | CA$948.50 | - | CA$52.69 | Real low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
| Western Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed)RenewedHDD · SATA | 18 TB | CA$900.99 | - | CA$50.06 | Near its low | - | ServerPartDeals | Buy on Amazon | |||||||||||||||||||||||||||||||
Prices we checked and would not pay (2)
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Used
(4)
Used listings carry no retest and usually no warranty. They are never counted toward whether this page is worth indexing.
| Product | Capacity | Price | Was | CA$ / TB | Verdict | 90 days | Prime | Seller | Buy |
|---|---|---|---|---|---|---|---|---|---|
| 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 | CA$948.50 | - | CA$52.69 | Real low | - | ServerPartDeals | Buy on Amazon | |
| Seagate Exos X20 18TB Internal Hard Drive - 3.5 Inch Hyperscale SATA 6GB/s HDD, 7,200 RPM, 2.5M MTBF, 512e and 4Kn FastFormat, Low Latency with Enhanced Caching (ST18000NM003D)UsedHDD · SATA | 18 TB | CA$705.44 | - | CA$39.19 | No history yetfirst seen 2026-08-20 | - | - | Serverpartdeals | Buy on Amazon |
| Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5" Internal - SATAUsedHDD · SATA | 18 TB | CA$1,145.65 | - | CA$63.65 | No history yetfirst seen 2026-09-28 | - | - | TechnoDealsUSA | Buy on Amazon |
| WD HGST 18TB 512MB 7200RPM SATA Ultra 512E SE NP Storage DEVICUsedHDD · SATA | 18 TB | CA$1,248.61 | - | CA$69.37 | No history yetfirst seen 2026-09-28 | - | - | TechnoDealsUSA | Buy on Amazon |
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 CA$893.68 on 2026-10-25, 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 18 TB listing today works out at CA$49.65/TB.
Renewed and recertified stock at 18 TB starts at CA$42.93/TB, with the seller rather than the manufacturer behind the warranty.
The cheapest external route to 18 TB is CA$58.07/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 06:02:04 UTC. As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date indicated on Amazon.ca 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.