TerraMaster F4-425 Plus Deals UK – Prime Big Deal Days 2026
Prices checked
Prime Big Deal Days runs 6 to 7 October 2026 for Prime members, with new Today's Big Deals three times a day. We re-check these prices at 08:00, 16:00 and 21:00 UK time.
As an Amazon Associate we earn from qualifying purchases. Prices and availability come from Amazon.co.uk as of the last update and may change.
The TerraMaster F4-425 Plus is £351.99 today, and is new to our tracker, so we cannot yet judge it against our own records. The best-value drive to fill it at a genuine low is the WD Red Pro 22TB at £365.00 (£16.59/TB).
The F4-425 Plus packs an Intel N150, 16GB of DDR5, two 5GbE ports and three M.2 slots into a four-bay box, a lot of hardware for its price. TerraMaster's TOS accepts any drive, so the fill cost is set by whatever NAS drive is cheapest that day. Below we test the enclosure against our log and build it out with four drives at several sizes.
Today's prices, judged against our own records
| Product | Size | Price | Amazon was | Value | Our recorded low | Verdict | |
|---|---|---|---|---|---|---|---|
| TerraMaster F4-425 PlusPrime deal checked 7 Oct 2026 | 4 bays | £351.99 | £88.00/bay | None yet | No history yet | Buy on Amazon | |
| WD Red Pro 22TB checked 6 Oct 2026 | 22TB | £365.00 | £16.59/TB | £365.0025 Jul 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf Pro 28TB checked 6 Oct 2026 | 28TB | £949.31 | £33.90/TB | £1,050.0026 Jul 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf 16TBPrime deal checked 6 Oct 2026 | 16TB | £564.53 | £35.28/TB | £579.0026 Jul 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf Pro 12TB checked 6 Oct 2026 | 12TB | £440.00 | £36.67/TB | £567.0022 Jul 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf 12TB checked 6 Oct 2026 | 12TB | £450.00 | £37.50/TB | £969.764 Aug 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf 16TB checked 6 Oct 2026 | 16TB | £605.00 | £37.81/TB | £615.0023 Sept 2026 | Real low | Buy on Amazon | |
| Toshiba N300 18TB checked 6 Oct 2026 | 18TB | £684.99 | £38.06/TB | £685.0213 Aug 2026 | Real low | Buy on Amazon | |
| Seagate IronWolf Pro 16TB checked 6 Oct 2026 | 16TB | £610.00 | £38.13/TB | £625.0028 Aug 2026 | Real low | Buy on Amazon |
Verdicts compare today's price with the lowest price we have recorded for the same listing. Amazon was is Amazon's own reference price. Prices can change after our check; the price on Amazon.co.uk at checkout applies.
Is it really a deal?
The F4-425 Plus is checked against every earlier price we logged for this listing, and its fill drives are rated the same way. 8 of 9 products we have re-priced are at or within 3% of their lowest recorded price; the WD Red Pro 22TB is equal to our recorded low of £365.00, logged on 25 Jul 2026. 1 is too new to our tracker to measure, so for it we show Amazon's own was-price as Amazon's claim, and the fill-cost table below is the better guide to value.
What a full build costs today
Each row adds enough of the cheapest in-stock NAS-rated CMR drive at that size to fill every bay, so the total is the real cost of a working TerraMaster F4-425 Plus.
| Build | Enclosure | Drives | Total | Usable | £ per usable TB | |
|---|---|---|---|---|---|---|
| TerraMaster F4-425 Plus+ 4 x WD Ultrastar 10TB Near our low | £351.99 | £1,053.16 | £1,405.15 | 27.3TB RAID 518.2TB RAID 6 | £51.50 | Buy Now |
| TerraMaster F4-425 Plus+ 4 x Seagate Exos X16 14TB Not rechecked yet | £351.99 | £1,523.16 | £1,875.15 | 38.2TB RAID 525.5TB RAID 6 | £49.09 | Buy Now |
| TerraMaster F4-425 Plus+ 4 x WD Ultrastar 16TB Not rechecked yet | £351.99 | £1,900.00 | £2,251.99 | 43.7TB RAID 529.1TB RAID 6 | £51.58 | Buy Now |
| TerraMaster F4-425 Plus+ 4 x Seagate IronWolf Pro 20TB Not rechecked yet | £351.99 | £2,443.08 | £2,795.07 | 54.6TB RAID 536.4TB RAID 6 | £51.22 | Buy Now |
| TerraMaster F4-425 Plus+ 4 x WD Red Pro 22TB Real low | £351.99 | £1,460.00 | £1,811.99 | 60.0TB RAID 540.0TB RAID 6 | £30.19 | Buy Now |
| TerraMaster F4-425 Plus+ 4 x Seagate Exos 26TB Above our low | £351.99 | £2,380.64 | £2,732.63 | 70.9TB RAID 547.3TB RAID 6 | £38.52 | Buy Now |
Usable space uses the same maths as our RAID calculator, after about 9% formatting overhead. Drive prices are the cheapest in-stock NAS-rated CMR drive at each size when we last checked. Buy Now adds the enclosure and all the drives to your Amazon.co.uk basket in one go.
Frequently asked questions
What can I do with dual 5GbE?
Use one port at 5GbE to a fast desktop and one for the rest of the house, or aggregate them. Most home networks will need a 5GbE or 10GbE switch to use the speed.
Is the N150 good enough for Plex?
Yes. It has Intel Quick Sync for hardware transcoding, which handles several 1080p streams or a 4K transcode.
What are the three M.2 slots for?
Cache or a fast storage pool. Three slots let you mirror two for apps and keep one for cache.
F4-425 Plus or F4-424 Pro?
The Plus has faster networking and an extra M.2 slot; the Pro has a stronger eight-core CPU and 32GB. Our F4-424 Pro page sets them side by side.
Related
- Best NAS drives for the TerraMaster F4-425 Plus
- TerraMaster F4-425 Plus capacity calculator
- Best RAM upgrade for the TerraMaster F4-425 Plus
- Best TerraMaster NAS UK 2026: Top Picks Ranked
- TerraMaster F4-424 Pro Deals UK – Prime Big Deal Days 2026
- TerraMaster NAS Deals UK – Prime Big Deal Days 2026
- 4-Bay NAS Deals UK – Prime Big Deal Days 2026
- All Prime Big Deal Days NAS and drive deals