20TB hard drives Black Friday UK Buying Guide 2026
Use this 20TB hard drives Black Friday buying guide to compare the exact products and configurations in this category. Start with the recorder, NAS or server receiving the drive, then compare the exact interface, capacity and condition. A surveillance HDD, NAS drive and complete external backup device have different installation requirements. Use the current offer price to calculate a complete storage upgrade, including any additional drives, mounting parts and independent backup.
Prices checked:
Amazon Black Friday sale: 19–30 November 2026
Black Friday itself is 27 November, but Amazon’s sale starts on 19 November. Early offers can be available before then. Check each offer’s current price, condition, Prime requirements and any end date before buying.
Dates confirmed by Amazon · Announcement updated 10 November 2026.
Buy an early offer or keep watching?
Buy now when…
The precise drive is supported by the target system, its condition and seller terms are clear and the complete upgrade is within budget.
Keep watching when…
The selected interface, capacity limit, warranty or required drive quantity remains unclear.
Before you buy
Check the full part number, SATA or SAS connection, physical size, firmware requirements, drive inclusion and the target system compatibility documentation.
Amazon Black Friday: 19–30 November 2026
Amazon’s Black Friday sale runs 19–30 November 2026; Black Friday itself is 27 November. Early offers can already be available before the main sale. Use this buying guide to compare suitable models, condition, sellers and the complete purchase cost.
Early offers you can buy now
Current retailer promotions and Amazon-reported markdowns. Each label states the evidence: a reduction against a listed RRP is not confirmation of a Black Friday promotion. Any reported Prime restriction or deal end time appears with the offer.
| Product & condition | Key details | Current price |
|---|---|---|
| Amazon markdownSeagate 20TB Expansion Desktop Hard Drive New · Seller: Amazon 22% below Amazon's listed RRP/list price |
Checked: 2026-11-13 16:09 UTC | £521.99£26.10/TBinc VAT Buy on Amazon |
20TB hard drives price drops before Black Friday
Below the listing's own average of prior daily prices for the same condition. Only the current price is shown. A price drop does not confirm a retailer's Black Friday promotion.
| Product & condition | Key details | Current price |
|---|---|---|
| Synology HDD HAT3320-20T 20TB SATA HDD Plus Series New · Seller: MoreCoCo |
Checked: 2026-11-13 15:09 UTC | £787.23£39.36/TBinc VAT Buy on Amazon |
| Synology HAT3320 20TB Plus Series SATA HDD New · Seller: AIMTECH |
Checked: 2026-11-13 14:39 UTC | £896.00£44.80/TBinc VAT Buy on Amazon |
Regular tracked listings at current prices
All matching in-stock listings, including regular prices. Each product appears once at its cheapest available offer, with condition and seller shown. Product classes are sorted separately.
Internal hard drives
Compare SATA or SAS, physical format and condition separately.
| Product & condition | Key details | Current price |
|---|---|---|
| Seagate Technology Exos X20 Used · Seller: Amazon EU |
Checked: 2026-11-14 00:39 UTC | £591.39£29.57/TBinc VAT Buy on Amazon |
| Seagate Barracuda 20TB Internal Hard Drive New · Seller: Scan Computers Intl Ltd |
Checked: 2026-11-13 13:09 UTC | £672.12£33.61/TBinc VAT Buy on Amazon |
| Seagate 20TB IronWolf Pro Internal NAS Hard Drive New · Seller: Amazon EU |
Checked: 2026-11-13 22:39 UTC | £714.02£35.70/TBinc VAT Buy on Amazon |
| Seagate IronWolf Pro New · Seller: Componix Global |
Checked: 2026-11-14 00:09 UTC | £715.00£35.75/TBinc VAT Buy on Amazon |
| Seagate IronWolf Pro ST20000NE00 RV-Sensor 3.5 Inch / 8.9 cm NAS 20TB HDD New · Seller: Componix Global |
Checked: 2026-11-13 21:39 UTC | £775.00£38.75/TBinc VAT Buy on Amazon |
| Synology HDD HAT3320-20T 20TB SATA HDD Plus Series New · Seller: MoreCoCo |
Checked: 2026-11-13 15:09 UTC | £787.23£39.36/TBinc VAT Buy on Amazon |
| Seagate SkyHawk AI New · Seller: PCBOOST |
Checked: 2026-11-13 22:09 UTC | £788.48£39.42/TBinc VAT Buy on Amazon |
| Toshiba S300 Surveillance AI 20TB 3.5" SATA HDD 7200 RPM 512MB Cache CMR New · Seller: MoreCoCo |
Checked: 2026-11-13 15:09 UTC | £798.70£39.94/TBinc VAT Buy on Amazon |
| Toshiba 8.9 cm (3.5") 20TB SATA3 Enterprise Capacity 7200 512 Internal New · Seller: MoreCoCo |
Checked: 2026-11-13 14:39 UTC | £886.99£44.35/TBinc VAT Buy on Amazon |
| Toshiba Enterprise HDD 20TB New · Seller: MoreCoCo |
Checked: 2026-11-14 00:09 UTC | £888.35£44.42/TBinc VAT Buy on Amazon |
| Synology HAT3320 20TB Plus Series SATA HDD New · Seller: AIMTECH |
Checked: 2026-11-13 14:39 UTC | £896.00£44.80/TBinc VAT Buy on Amazon |
| Synology HAT3320 Plus Series 20TB SATA III 3.5" Internal Hard Drive New · Seller: The Full-Cart |
Checked: 2026-11-13 14:39 UTC | £913.79£45.69/TBinc VAT Buy on Amazon |
Show 8 more listings
| Product & condition | Key details | Current price |
|---|---|---|
| WD Red Pro 20TB NAS 3.5" Internal Hard Drive New · Seller: PCBOOST |
Checked: 2026-11-13 13:09 UTC | £939.70£46.99/TBinc VAT Buy on Amazon |
| Seagate SkyHawk 20 TB New · Seller: PCBOOST |
Checked: 2026-11-13 14:09 UTC | £957.76£47.89/TBinc VAT Buy on Amazon |
| WD Red Pro 20TB NAS 3.5" Internal Hard Drive New · Seller: PCBOOST |
Checked: 2026-11-13 22:09 UTC | £999.00£49.95/TBinc VAT Buy on Amazon |
| Western Digital WD Ultrastar DC HC555 SATA HDD New · Seller: The Full-Cart |
Checked: 2026-11-13 13:39 UTC | £1,043.14£52.16/TBinc VAT Buy on Amazon |
| Synology Enterprise internal hard drive 20 TB 7200 RPM 512 MB 3.5" Serial ATA... New · Seller: Amazon |
Checked: 2026-11-14 02:09 UTC | £1,128.97£56.45/TBinc VAT Buy on Amazon |
| WD Ultrastar DC HC560 WUH722020BL5204 20 TB Hard Drive New · Seller: The Full-Cart |
Checked: 2026-11-14 00:39 UTC | £1,134.02£56.70/TBinc VAT Buy on Amazon |
| Western Digital 20TB WD Ultrastar DH HC560 7200RPM 512MB Ent, New · Seller: Nitrosocket |
Checked: 2026-11-13 22:39 UTC | £1,378.16£68.91/TBinc VAT Buy on Amazon |
| Seagate Technology Exos X20 New · Seller: CyberStorm UK ✅ |
Checked: 2026-11-13 22:09 UTC | £1,585.65£79.28/TBinc VAT Buy on Amazon |
Complete external hard drives
Compare the complete external device, included power and supplied drive.
| Product & condition | Key details | Current price |
|---|---|---|
| Seagate 20TB Expansion Desktop Hard Drive New · Seller: Amazon |
Checked: 2026-11-13 16:09 UTC | £521.99£26.10/TBinc VAT Buy on Amazon |
| Seagate 20TB Expansion Desktop Hard Drive New · Seller: Amazon EU |
Checked: 2026-11-13 16:09 UTC | £536.69£26.83/TBinc VAT Buy on Amazon |
Write down the exact drive and destination
Begin with the full manufacturer part number and the exact NAS, recorder, server or external connection being used. Similar family names can describe different interfaces, capacities, sectors or regional retail packages. Check the selected offer rather than transferring specifications from another capacity. Read the host documentation for supported drives and installation procedures. The current listing title is useful identification evidence, but a seller compatibility claim is not a test performed by DatacenterDisk. Keep the model, condition, seller and proposed destination together while comparing the shortlist.
Separate interfaces and complete external devices
A SATA HDD and a SAS HDD can look similar while requiring different host connections. Confirm the supported protocol, power connection and physical mounting before buying an adapter or controller. An external USB HDD is a complete device with an enclosure and bridge; its price includes different components from a bare internal drive. Read the supplied power adapter, regional plug and cable details. Do not assume a USB enclosure accepts a SAS drive or that an external product contains a particular internal model unless the manufacturer documents that configuration.
Calculate the full set of drives
List how many drives the system actually needs, the capacity of each and the proposed storage layout. Raw purchased capacity differs from available space after redundancy, formatting and other system requirements. Compare equal drive counts and conditions, then include replacement trays, supported cables or adapters and a separate backup. A price per TB helps compare capacity cost, but does not measure performance, suitability or reliability. For an expansion, check how the exact software handles the new capacity and whether temporary backup space is needed during the change.
Match recording and workload requirements
For surveillance, choose capacity from your camera count, recording settings, schedule and required retention period. Check the recorder model, supported drive size and manufacturer installation advice. For a NAS or server, read the relevant drive and workload requirements instead of assuming that every large HDD has identical behavior. Vendor endurance and performance statements apply to specific models and are not our measurements. This page does not calculate a guaranteed number of recording days from capacity alone, because changing bitrate, activity and recording mode changes the storage requirement.
Keep condition and warranty attached to the price
New, used, renewed and manufacturer-recertified descriptions need separate checks. Read who provides the warranty, what the actual seller promises and which returns procedure applies to this offer. A title containing a familiar drive family does not establish a manufacturer refurbishment program. Compare like-for-like conditions and retain the full part number shown at purchase. A smaller current price can suit a planned backup or spare-drive purchase, but condition and support still matter when assessing the complete storage budget and expected service arrangements.
Plan migration and recovery before checkout
An additional drive is useful only when you can install it and restore the data you need. Check available bays, mounting hardware, supported array expansion and the sequence recommended by the system manufacturer. Keep an independent backup before replacing disks or changing storage modes. Consider how a failed enclosure, controller or recorder would be replaced and how important files would be recovered. The offers below provide current prices and configuration evidence; they do not certify a recovery plan or promise that a drive will work in every system carrying the same brand.
Compare 20TB as a drive and as a complete build
This capacity group keeps bare internal and complete external hard drives separate. Within the internal group, check SATA versus SAS and compare equal conditions. An external-device price includes the case and bridge and does not establish a specific internal mechanism. Multiply the current unit price by the number of drives required and add mounting, connections and an independent backup. Usable array capacity depends on the exact layout. A matching capacity figure alone does not replace support checks for the NAS, recorder or server.
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How DatacenterDisk Compares UK Prices
Prices come from the Amazon Creators API for Amazon.co.uk through the existing UK refresh service. We do not convert US or German prices to pounds or carry discounts across marketplaces. Each row shows when its price was last checked. Prices and availability can change after that check; the price on Amazon.co.uk at checkout applies.
A price drop needs at least seven prior daily observations of the same product in the same condition, with the current price at least five per cent below their average. The comparison uses available days in the previous 30 days and excludes today. A short record is not a complete 30-day average. Newly discovered products first appear in the regular table. Historical prices and per-listing discount percentages are not displayed.
Price per TB divides the current offer price by the recorded capacity. It does not measure reliability, performance or suitability. Mini PCs, UPS units, docks, empty enclosures and networking parts have no useful storage cost per TB, so a dash appears instead. Condition stays attached to the offer: used stock is not presented as new, and a low price does not establish the warranty or included accessories.
What to Check Before Buying
Start with the exact part number. Check the interface, form factor and requirements of the system receiving the part. Compare new and used stock separately, then read the seller, return terms and warranty on the actual offer. We do not test these products ourselves or confirm compatibility from a price or listing title.
Use the price-per-TB comparison for the ongoing price overview, and read about refurbished enterprise drives before weighing used stock against a new drive. Offers and seller names come from the Amazon listing; Amazon.co.uk is the only merchant priced in this UK section.