| £/TB | Price | Size | Tech | Form Factor | Condition | Description | Rating | Reviews | |
|---|---|---|---|---|---|---|---|---|---|
 | £32.75 | £130.99 | 4 TB | HDD | 3.5" | New | WD Red Plus 4TB NAS 3.5" Internal Hard Drive - 5400 RPM, SATA 6Gb/s, CMR, 128MB Cache100+ bought last month Buy | ★★★★½ 4.6 | 94 |
 | £36.99 | £147.94 | 4 TB | HDD | 3.5" | Warehouse | ★★★★½ 4.6 | 8,564 | |
 | £43.75 | £174.98 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 474 | |
 | £47.50 | £190.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 90 | |
 | £48.50 | £194.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 2,098 | |
 | £49.24 | £196.94-0.6% 24h | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 285 | |
 | £49.59 | £198.35+0.0% 24h | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 500 | |
 | £51.26 | £205.02-1.9% 24h | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,999 | |
 | £52.25 | £209.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 117 | |
 | £52.25 | £209.00+19.4% 24h | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 5,244 | |
 | £52.50 | £210.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 133 | |
 | £53.61 | £214.45 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 22,243 | |
 | £54.74 | £218.96-0.0% 24h | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,508 | |
| £54.74 | £218.96 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 2,750 | |
 | £55.00 | £219.99 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 52 | |
 | £56.50 | £225.99 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 283 | |
 | £56.94 | £227.77 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 68 | |
 | £57.00 | £228.00 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.7 | 29 | |
 | £60.50 | £242.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 72 | |
 | £61.25 | £245.00 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.8 | 7 | |
 | £61.25 | £245.00 | 4 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 4 | |
| £62.27 | £249.09 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 143 | |
 | £62.50 | £249.98 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 731 | |
 | £63.00 | £252.00-8.0% 24h | 4 TB | HDD | 3.5" | New | ★★★★½ 4.8 | 6 | |
 | £63.15 | £252.60 | 4 TB | HDD | External | New | ★★★★☆ 4.1 | 701 | |
 | £67.08 | £268.32 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 21 | |
 | £72.12 | £288.49 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 12,309 | |
 | £72.49 | £289.95 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £73.75 | £295.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 1,805 | |
 | £75.00 | £300.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 1,308 | |
 | £78.00 | £311.99-3.1% 24h | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 303 | |
 | £82.23 | £328.90 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 205 | |
 | £89.49 | £357.94+0.9% 24h | 4 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 2 | |
 | £105.00 | £419.98 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 12 | |
 | £112.77 | £451.06 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 434 | |
 | £141.37 | £565.46 | 4 TB | HDD | External | New | ★★★★☆ 4.0 | 279 | |
| £158.10 | £632.38 | 4 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 38 |
Choosing a 4TB NAS drive
Today the best value is WD Red Plus 4TB NAS 3.5" Internal Hard Drive at £130.99 (£32.75/TB). At 4TB you are most likely filling a two- or four-bay home NAS for photos, documents and backups. This is also the size range where plain "WD Red" drives are shingled (SMR), which can slow RAID rebuilds badly — the Red Plus and Red Pro are the CMR versions. IronWolf and Toshiba N300 are CMR throughout.
- 2-bay, RAID 1 (mirror): 4TB usable from 2 × 4TB, about £261.98 in drives at today’s best price.
- 4-bay, RAID 5: 12TB usable from 4 × 4TB, about £523.96 in drives at today’s best price.
- 5-bay, RAID 5: 16TB usable from 5 × 4TB, about £654.95 in drives at today’s best price.
- 8-bay, RAID 6: 24TB usable from 8 × 4TB, about £1,047.92 in drives at today’s best price.
4TB NAS drives by family
| Family | Drives | Best £/TB | Best-value model |
|---|---|---|---|
| Seagate IronWolf Pro | 1 | £51.26/TB | Seagate 4TB IronWolf Pro Internal NAS Hard Dr |
| Seagate IronWolf | 7 | £36.99/TB | Seagate 4TB IronWolf Internal NAS Hard Drive |
| WD Red Pro | 6 | £47.50/TB | WD Red Pro 4TB NAS 3.5-inch Desktop Hard Driv |
| WD Red Plus | 9 | £32.75/TB | WD Red Plus 4TB NAS 3.5" Internal Hard Drive |
| Toshiba N300 | 5 | £56.50/TB | Toshiba N300 4TB Internal NAS Hard Drive |
| Toshiba MG | 1 | £89.49/TB | Toshiba MG Series 4TB Internal Enterprise Har |
Buy drives from more than one batch when filling a multi-bay array, to cut the risk of two failing together. For the full picture see our NAS drive guide, SMR vs CMR and when to replace NAS drives, or compare every size on the NAS drive hub.
Frequently asked questions
How does disks.co.uk rank 4TB NAS drives?
We rank every 4TB NAS drives by real cost per terabyte (£/TB) — the live Amazon.co.uk price divided by capacity — so the best value appears at the top. Prices refresh several times a day from Keepa, with 24-hour movement and all-time-low flags.
What is the cheapest 4TB NAS drives right now?
The drive at the top of the table above is the cheapest of the 4TB NAS drives by £/TB today. At larger sizes the enterprise Exos, Toshiba MG and Ultrastar drives are often cheaper per terabyte than the NAS-branded lines; they are louder, but carry 5-year warranties.
Are all of these drives CMR?
The NAS-rated families listed here — IronWolf and IronWolf Pro, WD Red Plus and Red Pro, Toshiba N300 — and the enterprise drives all use conventional (CMR) recording. The one to watch is plain "WD Red" (no Plus or Pro) in the 2–6TB sizes, which is shingled (SMR) and a poor fit for RAID. See SMR vs CMR.
How many 4TB NAS drives do I need?
It depends on the bay count and RAID level: two drives in RAID 1 give you one drive's space with a full mirror; four in RAID 5 give three drives' worth and survive one failure. The section below works out usable space and cost at this size, and our NAS drive guide covers the choice in more detail.