| £/TB | Price | Size | Tech | Form Factor | Condition | Description | Rating | Reviews | |
|---|---|---|---|---|---|---|---|---|---|
 | £22.86 | £640.06 | 28 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.1 | 136 | |
 | £23.04 | £599.00 | 26 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 68 | |
 | £23.91 | £334.75 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 96 | |
 | £24.58 | £344.07 | 14 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.1 | 84 | |
| £24.64 | £345.01 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 51 | |
 | £25.42 | £610.19 | 24 TB | HDD | 3.5" | Warehouse | ★★★★½ 4.7 | 74 | |
 | £25.95 | £571.00 | 22 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.2 | 207 | |
 | £27.83 | £278.33 | 10 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 2 | |
 | £28.56 | £628.37+0.0% 24h | 22 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.3 | 31 | |
 | £31.79 | £445.00 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 623 | |
 | £31.90 | £319.00 | 10 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 17 | |
 | £32.00 | £640.06 | 20 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.4 | 16 | |
 | £32.40 | £194.40 | 6 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.3 | 6 | |
 | £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 |
 | £34.17 | £615.00 | 18 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.2 | 122 | |
 | £34.55 | £621.90-1.3% 24h | 18 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 200 | |
 | £34.72 | £625.00 | 18 TB | HDD | 3.5" | Renewed | ★★★★☆ 4.2 | 124 | |
 | £34.80 | £417.63 | 12 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 1 | |
 | £35.33 | £423.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 1,556 | |
 | £35.56 | £640.00 | 18 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 679 | |
 | £35.75 | £715.00 | 20 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 123 | |
 | £35.87 | £573.99 | 16 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 432 | |
 | £36.25 | £435.00 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 89 | |
 | £36.99 | £147.94 | 4 TB | HDD | 3.5" | Warehouse | ★★★★½ 4.6 | 8,564 | |
 | £37.09 | £445.02 | 12 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 8,564 | |
 | £37.19 | £595.00 | 16 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 2 | |
 | £37.50 | £299.99 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 73 | |
 | £37.50 | £599.99 | 16 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 37 | |
 | £38.06 | £684.99 | 18 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 283 | |
 | £38.06 | £684.99 | 18 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 49 | |
 | £38.99 | £545.88 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 113 | |
 | £39.19 | £313.50 | 8 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 8,564 | |
 | £39.27 | £785.47 | 20 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,999 | |
| £39.59 | £475.02 | 12 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,999 | |
 | £39.80 | £397.99 | 10 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 27 | |
 | £39.83 | £477.99 | 12 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 500 | |
 | £39.90 | £478.77-0.3% 24h | 12 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 434 | |
 | £39.90 | £478.77 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 1,471 | |
 | £40.00 | £639.98 | 16 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 283 | |
 | £40.00 | £240.00 | 6 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 656 | |
 | £40.00 | £640.02 | 16 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,999 | |
 | £40.00 | £639.98 | 16 TB | HDD | 3.5" | New | ★★★★½ 4.8 | 6 | |
 | £41.00 | £327.99 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 1,081 | |
 | £41.05 | £246.32 | 6 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 2 | |
 | £41.25 | £494.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 215 | |
 | £41.36 | £579.00 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 1,471 | |
| £41.36 | £579.00 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 283 | |
 | £41.66 | £249.98 | 6 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 1,556 | |
| £41.67 | £499.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 973 | |
 | £41.67 | £250.00 | 6 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 166 | |
 | £41.67 | £250.00 | 6 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 8,564 | |
| £41.67 | £499.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 283 | |
 | £41.81 | £334.48-10.9% 24h | 8 TB | HDD | External | New | ★★★★☆ 4.1 | 701 | |
 | £42.32 | £507.87 | 12 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 303 | |
 | £42.45 | £848.99 | 20 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £42.50 | £254.99 | 6 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 500 | |
 | £42.50 | £339.99 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 132 | |
 | £42.50 | £425.00 | 10 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 539 | |
 | £42.51 | £127.52 | 3 TB | HDD | 3.5" | Warehouse | ★★★★☆ 4.4 | 5,244 | |
 | £42.62 | £1,022.78 | 24 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 121 | |
 | £42.76 | £342.08 | 8 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 58 | |
 | £42.78 | £598.95-0.0% 24h | 14 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 49 | |
 | £42.84 | £685.47+1.0% 24h | 16 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £43.13 | £345.00+1.5% 24h | 8 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,999 | |
 | £43.34 | £520.02 | 12 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 1,026 | |
 | £43.40 | £954.75 | 22 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £43.75 | £174.98 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 474 | |
 | £43.90 | £438.99 | 10 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 22 | |
 | £44.10 | £440.99 | 10 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 166 | |
 | £44.18 | £1,413.66 | 32 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 1 | |
 | £44.42 | £1,066.05 | 24 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £44.94 | £719.00 | 16 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 2 | |
 | £44.99 | £44.99 | 1 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 182 | |
 | £45.00 | £449.98 | 10 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 1,508 | |
 | £45.42 | £363.33 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.2 | 58 | |
 | £45.50 | £545.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 5,244 | |
 | £45.71 | £457.14+0.1% 24h | 10 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 205 | |
 | £45.77 | £823.81-8.2% 24h | 18 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
| £46.09 | £276.52 | 6 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 734 | |
 | £46.16 | £1,200.10 | 26 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £46.25 | £369.99 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 299 | |
 | £46.67 | £559.99 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 10 | |
 | £46.85 | £937.08 | 20 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 733 | |
 | £46.88 | £375.00 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1 | |
 | £47.00 | £469.99 | 10 TB | HDD | 3.5" | New | ★★★★½ 4.5 | 600 | |
 | £47.13 | £377.00 | 8 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 434 | |
 | £47.50 | £190.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 90 | |
 | £47.62 | £380.92 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.0 | 1,821 | |
 | £47.85 | £382.81 | 8 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 482 | |
 | £48.08 | £576.90 | 12 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 733 | |
 | £48.50 | £388.00 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 360 | |
| £48.50 | £388.00 | 8 TB | HDD | 3.5" | New | ★★★★☆ 4.3 | 1,471 | |
 | £48.50 | £388.00 | 8 TB | HDD | 3.5" | New | ★★★★½ 4.6 | 807 | |
 | £48.50 | £194.00 | 4 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 2,098 | |
 | £48.80 | £488.00 | 10 TB | HDD | 3.5" | New | ★★★★★ 5.0 | 7 | |
 | £48.80 | £488.00 | 10 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 1,840 | |
 | £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 | |
| £49.59 | £694.22 | 14 TB | HDD | 3.5" | New | ★★★★☆ 4.1 | 733 | |
 | £49.83 | £299.00 | 6 TB | HDD | 3.5" | New | ★★★★☆ 4.4 | 5,244 |
NAS hard drives by size
The cheapest drive from the main NAS and enterprise families at each capacity right now, by real cost per terabyte. Each size has its own page ranking every NAS drive at that capacity.
| Size | Cheapest NAS drive today | Price | £/TB |
|---|---|---|---|
| 2TB NAS drives | WD Red Plus 2TB NAS 3.5" Internal Hard Drive | £113.99 | £57.00/TB |
| 4TB NAS drives | WD Red Plus 4TB NAS 3.5" Internal Hard Drive | £130.99 | £32.75/TB |
| 6TB NAS drives | HGST Ultrastar 7K6000 HUS726060ALE610 | £194.40 | £32.40/TB |
| 8TB NAS drives | TOSHIBA 8.9cm | £299.99 | £37.50/TB |
| 10TB NAS drives | HGST Ultrastar He10 | £278.33 | £27.83/TB |
| 12TB NAS drives | HGST Ultrastar He12 | £417.63 | £34.80/TB |
| 14TB NAS drives | Toshiba 14TB SATA 512e 256MB Cache 7200RPM 3.5" SATA 6. | £344.07 | £24.58/TB |
| 16TB NAS drives | Seagate IronWolf | £573.99 | £35.87/TB |
| 18TB NAS drives | Seagate IronWolf Pro 18TB NAS HDD | £615.00 | £34.17/TB |
| 20TB NAS drives | Seagate Technology Exos X20 | £640.06 | £32.00/TB |
NAS drive families compared
Every family below uses conventional (CMR) recording, which is what you want in a RAID array. Plain "WD Red" without Plus or Pro is shingled (SMR) in the 2–6TB sizes and is left out of this table — see SMR vs CMR. Exos, Toshiba MG and Ultrastar are enterprise drives: louder and hotter than the NAS lines, but often the cheapest per terabyte at 12TB and above.
| Family | Drives | Sizes listed | Best £/TB | Best-value model |
|---|---|---|---|---|
| Seagate IronWolf Pro | 18 | 4 TB–32 TB | £25.42/TB | Seagate 24TB IronWolf Pro Internal NAS Hard D |
| Seagate IronWolf | 37 | 1 TB–16 TB | £35.33/TB | Seagate IronWolf ST12000VN0008 |
| WD Red Pro | 35 | 2 TB–26 TB | £42.45/TB | WD Red Pro 20TB NAS 3.5" Internal Hard Drive |
| WD Red Plus | 31 | 2 TB–12 TB | £32.75/TB | WD Red Plus 4TB NAS 3.5" Internal Hard Drive |
| Toshiba N300 | 33 | 4 TB–22 TB | £37.50/TB | TOSHIBA 8.9cm |
| Seagate Exos | 18 | 600 GB–28 TB | £22.86/TB | Seagate Exos 28TB internal server hard drive |
| Toshiba MG | 10 | 4 TB–20 TB | £24.58/TB | Toshiba 14TB SATA 512e 256MB Cache 7200RPM 3. |
| WD Ultrastar | 19 | 1 TB–48 TB | £27.83/TB | HGST Ultrastar He10 |
What it costs to fill a NAS
Usable space after redundancy, and the cost of the drives at today's best-value price for each size. RAID 1 keeps a full copy on the second drive; RAID 5 gives up one drive's worth of space and survives one failure; RAID 6 gives up two and survives two. RAID is not a backup — keep a separate copy of anything you cannot replace.
| Drive size | 2-bay, RAID 1 (mirror) | 4-bay, RAID 5 | 5-bay, RAID 5 | 8-bay, RAID 6 |
|---|---|---|---|---|
| 4TB at £130.99 | 4TB usable £261.98 for 2 | 12TB usable £523.96 for 4 | 16TB usable £654.95 for 5 | 24TB usable £1,047.92 for 8 |
| 8TB at £299.99 | 8TB usable £599.98 for 2 | 24TB usable £1,199.96 for 4 | 32TB usable £1,499.95 for 5 | 48TB usable £2,399.92 for 8 |
| 12TB at £417.63 | 12TB usable £835.26 for 2 | 36TB usable £1,670.52 for 4 | 48TB usable £2,088.15 for 5 | 72TB usable £3,341.04 for 8 |
| 16TB at £573.99 | 16TB usable £1,147.98 for 2 | 48TB usable £2,295.96 for 4 | 64TB usable £2,869.95 for 5 | 96TB usable £4,591.92 for 8 |
| 20TB at £640.06 | 20TB usable £1,280.12 for 2 | 60TB usable £2,560.24 for 4 | 80TB usable £3,200.30 for 5 | 120TB usable £5,120.48 for 8 |
Choosing hard drives for a NAS
A NAS runs its drives 24/7, often several at once, which changes which drives make sense — not every hard drive is built for that. The table above ranks every NAS-rated drive we track by real cost per terabyte; for the full buying advice see our NAS drive guide.
- WD Red Plus / Red Pro, Seagate IronWolf / IronWolf Pro, Toshiba N300: the main NAS-rated families, built for continuous operation and RAID vibration.
- Avoid SMR for RAID: shingled drives can be painfully slow rebuilding an array — see SMR vs CMR.
- Buy from more than one batch when filling a multi-bay array, to reduce the risk of simultaneous failure.
Larger 3.5" drives usually give the best £/TB for a NAS build — check 12TB, 14TB and 16TB for where the value currently sits.
Frequently asked questions
How does disks.co.uk rank NAS drives?
We rank every 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.
Which NAS drives should I buy?
Choose NAS-rated families such as WD Red Plus/Pro, Seagate IronWolf or Toshiba N300 — they are built for 24/7 use. Avoid SMR models for RAID (see SMR vs CMR), and buy from more than one batch to reduce simultaneous-failure risk.
Why are NAS drives more expensive per terabyte?
NAS drives carry higher workload ratings, RAID-tuned firmware and longer warranties than desktop drives, so they cost a little more per terabyte — but they last far longer under continuous load. Full detail in our NAS drive guide.