18tb
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Returns
Good2.8%return rate — above 5% kills the launch gate
Competition
Okay67%top-5 click share — leaders hold, buyers still browse
Avg price
Okay£305.87avg listing price — sweet spot $15–$100
Review moat
Bad7,676.61avg incumbent reviews — the moat a new listing must climb
Growth
Bad-19.5%90-day search growth — must beat 0% to launch
Market size
Bad£47K£47K/yr · 26K searches
Conversion
Bad0.6%search→purchase rate — share of searches ending in a sale
Brand share
Bad100%top-5 brand share — brand-locked demand
Price range
Bad£227.49–£419.69cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, 18tb is a £47K/yr Amazon United Kingdom market (26K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Nov. Verdict: Skip it — 25/100.
Data updated Jul 21, 2026 · scored weekly · How we score niches
18tb market data
- Units sold / yr
- 250–500
- avg 0–100/product
- Revenue / yr
- £76K–£153K
- units × avg price
- Conversion rate
- 0.6%
- Avg BSR
- #77
- Page quality
- 0%
- Prime
- 72%
- Sponsored
- 56%
- Out of stock
- 1.2%
- Avg brand age
- 45 months
- Avg seller age
- 170 days
Competition & brand share
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.Brands
3 flat
Sellers
274
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
67%
Top 20: 100%
Open market
0%
- Western Digital62%
- Seagate36%
- Toshiba3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 98 weeks — -19.5% search growth over the last 90 days.Peak months: Nov · busiest ÷ quietest = 1.9×
Top 18tb search terms
- 18tb hard drive13K/yr
- 18tb6K/yr
- 18tb external hard drive4K/yr
- 18tb hdd4K/yr
Top 18tb products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
WD 18TB 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
Western Digital£279.044.3★7,392 rev
WD 18TB Elements Desktop External Hard Drive - USB 3.0 Black
Western Digital£241.194.6★19,698 rev
Seagate Exos X18 Enterprise Class 18TB Enterprise Internal Hard Drive SATA 3 5 6Gbit/s 128MB cache ((ST18000NM000J)
Seagate£316.424.0★674 rev
Seagate Expansion Desktop 20TB External Hard Drive USB 3.0 Data Rescue Services (STKP20000400)
Seagate£272.384.3★18,468 rev
Seagate Expansion Desktop 16TB External Hard Drive USB 3.0 Data Rescue Services (STKP16000400)
Seagate£227.494.3★18,468 rev
Newest
by launch dateSeagate Expansion Desktop 20TB External Hard Drive USB 3.0 Data Rescue Services (STKP20000400)
Seagate£272.3818,468 rev
Seagate IronWolf Pro 20TB Enterprise Internal NAS HDD CMR 3.5 Inch SATA 6GB/s 7.200 RPM 256MB Cache for RAID NAS Rescue Services - Frustration Free Packaging (ST20000NTZ01)
Seagate£412.84987 rev
Seagate Exos X22 22TB Internal Server Festplatte ST22000NM000C 3.5 Zoll HDD SATA 6Gb/s 512E SED 7200RPM 512MB Cache (Refurbished)
Seagate£325.24183 rev
Seagate Exos 28TB internal server hard drive ST28000NM000C 3.5 HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed)
Seagate£371.75128 rev
Seagate Enterprise 3.5 18000 GB 7200 RPM 18 TB 3.5 7200 RPM SATA ST18000NM00J (Renewed)
Seagate£247.50156 rev
Trending
90-day click momentum
Seagate One Touch Hub 18TB External Hard Drive Desktop HDD USB-C & USB 3.0 port for Computer Desktop Workstation PC Laptop Mac (STLC18000400)
Seagate£343.854.0★
Seagate Exos 28TB internal server hard drive ST28000NM000C 3.5 HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed)
Seagate£371.754.2★
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
Western Digital£270.564.3★
WD 18TB 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
Western Digital£279.044.3★
Western Digital Ultrastar DC HC550 Enterprise Hard Drive 18TB (3.5 SATA 6Gbps SAS 12Gbps 7200RPM 512MB Cache)
Western Digital£379.523.7★
What buyers say about 18tb
What buyers praise and complain about, mined from review topics.What buyers love
“easy to setup, decent transfer and access rates”
“Great value for 20TB of storage”
“durable”
“Great value”
“Works as expected”
“Compatible with other laptops as well as Mac books”
“Good quality drive, fast speeds”
“Good for expansion”
“Easy use for DIT”
“Setup was easy”
What buyers complain about
“Total failure”
“Ridiculously loud”
“I know that you don't get the full storage because of os and suff”
“Its not cheap”
“Doesn't feel rugged”
“SATA or SAS ERROR”
“Didn't work, returned”
“Old used disks supplied”
“Worthless Garbage”
“Data speed transfer could have been a bit faster”
Top return reasons
Common questions
- Is 18tb profitable to sell on Amazon United Kingdom?
- The niche generates £47K/yr across 18 tracked products. 90-day search growth is -19.5%. Flapen's verdict: Skip it (25/100).
- How competitive is the 18tb niche?
- 3 brands and 274 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in 18tb?
- Top complaints mined from reviews: Durability, Noise Level, Storage Capacity. The return rate is 2.8%.
- When does demand for 18tb peak?
- Demand peaks in Nov; the busiest month runs 1.9× the quietest.
- What does it cost to enter the 18tb niche?
- Listings span £227.49–£419.69; the average listing price is £305.87 (sweet spot $15–$100). The average incumbent carries 7,677 reviews — the moat a new listing must climb.