18TB Hard Drive Deals UK 2026: Prime Big Deal Days Offers
· Prime Big Deal Days has ended; the prices below are still live.
As an Amazon Associate we earn from qualifying purchases. Prices and availability shown are from Amazon.co.uk at the last update and may change.
Amazon is flagging 12 offers on this selection right now. The cheapest new price per TB on this page is £25.89/TB, on the WD 18TB Elements Desktop External Hard.
We track 16 in-stock listings for this selection on Amazon.co.uk. Offers below are shown as Amazon states them, then compared with the cheapest listings by £/TB.
Deals Amazon is flagging
In-stock listings where Amazon shows a deal badge, a Prime-exclusive offer, a list price above the current price or low stock. Sorted by Amazon’s stated saving in pounds. We add no verdict.
New
Renewed
| Product | Capacity | Price | Amazon’s list price | Amazon’s stated saving | £/TB | Condition | Sold by | Buy |
|---|---|---|---|---|---|---|---|---|
| Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed) | 18 TB | £503.99 | £136.0121% | £28.00 | Renewed | Third party | Buy on Amazon | |
| Seagate IronWolf Pro 18TB NAS HDD, ST18000NE000 SATA 6Gb/s 3.5" (Renewed) | 18 TB | £615.00 | - | - | £34.17 | Renewed | Third party | Buy on Amazon |
| Seagate IronWolf PRO 18TB Interne Festplatte CMR 3.5 Zoll SATA III 256 MB, ST18000NE000 (Renewed) | 18 TB | £625.00 | - | - | £34.72 | Renewed | Third party | Buy on Amazon |
Cheapest alternatives by £/TB
For each offer above, the 3 cheapest in-stock listings of the same type at the same capacity (hard drives within 2TB), with or without an Amazon offer.
| Product | Capacity | Price | Amazon’s list price | Amazon’s stated saving | £/TB | Condition | Sold by | Buy |
|---|---|---|---|---|---|---|---|---|
| Seagate 20TB One Touch Desktop Hard Drive | USB-C (STNB20000400) | Bus-powered HDD. Single cable. Requires 15W USB-C power. PC & Mac. Adobe CC & Mylio trial. 2-Year Warranty + 2-Year Rescue | 20 TB | £516.99 | - | - | £25.85 | New | AmazonPrime | Buy on Amazon |
| WD 18TB Elements Desktop External Hard Drive - USB 3.0, Black | 18 TB | £465.99 | - | - | £25.89 | New | AmazonPrime | Buy on Amazon |
| WD 16TB My Book external hard drive, Desktop HDD with Password Protection, USB 3.0, SuperSpeed USB, software for device management, backup, hardware encryption, works with PC and Mac, Black | 16 TB | £433.99 | - | - | £27.12 | New | AmazonPrime | Buy on Amazon |
Frequently asked questions
When is Prime Big Deal Days 2026?
Prime Big Deal Days 2026 runs on Amazon.co.uk on 6 and 7 October 2026, from 00:01 on 6 October to 23:59 BST on 7 October, with new offers appearing through both days.
Do I need Prime to get these offers?
Yes for offers marked Prime exclusive in our tables: Amazon reserves those for Prime members. The other prices shown are available to every Amazon.co.uk customer.
Is Amazon's list price reliable?
UK consumer protection rules require a reference price to be genuine, and we show it exactly as Amazon states it, with Amazon's own label, without recalculating it.
All Prime Big Deal Days 2026 storage deals
Last updated at 2026-10-22 18:00:46 UTC. As an Amazon Associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed at the time of purchase will apply to the purchase of the product. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON SERVICES LLC.