- Flapen Score
- 25 / 100Ranks 986 of 1,028 Computers & Accessories niches · −17 vs the category median of 4225
- Market size
- £47K/yr26K searches / yr
- 90-day growth
- -19.5%search demand this quarter
- Competition
- 67%top-5 click share · 3 brands · 274 sellers
Flapen Score
18tb against its category
The dotted line is the Computers & Accessories average. Past it, 18tb is stronger. Inside it, weaker.
Market
The 18tb market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for 18tb 26K times last year and spent an estimated £47K. All 3 brands take every click. Demand peaks in Nov. Flapen scores it 25 out of 100, a Fail.
01 · Demand
An estimated 0.6% of those searches ended in a purchase.
Shoppers searched for this 26K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 0.6% of those searches ended in a purchase. Searches in the last 90 days moved -19.5% against the 90 days before. Searches, conversion and average price together put the market at an estimated £47K a year.
- Searches, last 12 months
- 26K
- Growth, 90 days vs prior 90
- -19.5%
- Conversion, latest week
- 0.6%
- Market size, estimated
- £47Ka year
- Peak month
- November1.9× the quietest month
- Top search term
- 18tb hard drive13K searches a year
02 · Price
A sale here is worth £305.87.
Listings sell for £305.87 on average, from £227.49 to £419.69. Amazon reports units sold in ranges. This niche sold 250 to 500 a year. The average listing sells 0 to 100 of them. At £305.87 that is £0 to £31K a year per listing.
- Average price
- £305.87above the $15 to $100 sweet spot
- Price range
- £227.49–£419.69
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 250–500
- Units per listing a year
- 0–100
- Revenue per listing a year
- £0–£31K
- Returns
- 2.8%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is reviews.
56% of listings pay for placement with sponsored ads. 72% ship with Prime. On an average day, 1.2% of listings are out of stock. The average listing ranks #77 within Data Storage. It carries 7,677 reviews at 4.23 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 56%
- Prime listings
- 72%
- Out of stock, average day
- 1.2%
- Average rank
- #77in Data Storage
- Average rating
- 4.23 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 7,677per listing
- Listings tracked
- 18
04 · Newcomers
Brands here are settling in.
The brands on the shelf have sold for 45 months on average, so the names here are settling in.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 45 months
Products
Top 18tb products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 21, 2026. The live listing can differ.
Top sellers
by estimated 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
- Price
- £279.04
- Rating
- 4.3/5
- Reviews
- 7,392
- Age
- 5y ago

WD 18TB Elements Desktop External Hard Drive - USB 3.0 Black
- Price
- £241.19
- Rating
- 4.6/5
- Reviews
- 19,698
- Age
- 5y ago

Seagate Exos X18 Enterprise Class 18TB Enterprise Internal Hard Drive SATA 3 5 6Gbit/s 128MB cache ((ST18000NM000J)
- Price
- £316.42
- Rating
- 4.0/5
- Reviews
- 674
- Age
- 5y ago

Seagate Expansion Desktop 20TB External Hard Drive USB 3.0 Data Rescue Services (STKP20000400)
- Price
- £272.38
- Rating
- 4.3/5
- Reviews
- 18,468
- Age
- 1y ago

Seagate Expansion Desktop 16TB External Hard Drive USB 3.0 Data Rescue Services (STKP16000400)
- Price
- £227.49
- Rating
- 4.3/5
- Reviews
- 18,468
- Age
- 6y ago
Trending
estimated 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)
- Price
- £343.85
- Rating
- 4.0/5
- Reviews
- 2,730
- Age
- 4y ago

Seagate Exos 28TB internal server hard drive ST28000NM000C 3.5 HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed)
- Price
- £371.75
- Rating
- 4.2/5
- Reviews
- 128
- Age
- 1y ago

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
- Price
- £270.56
- Rating
- 4.3/5
- Reviews
- 7,392
- Age
- 5y ago

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
- Price
- £279.04
- Rating
- 4.3/5
- Reviews
- 7,392
- Age
- 5y ago

Western Digital Ultrastar DC HC550 Enterprise Hard Drive 18TB (3.5 SATA 6Gbps SAS 12Gbps 7200RPM 512MB Cache)
- Price
- £379.52
- Rating
- 3.7/5
- Reviews
- 183
- Age
- 6y ago
Newest
by launch date
Seagate Expansion Desktop 20TB External Hard Drive USB 3.0 Data Rescue Services (STKP20000400)
- Price
- £272.38
- Rating
- 4.3/5
- Reviews
- 18,468
- Age
- 1y ago

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)
- Price
- £412.84
- Rating
- 4.5/5
- Reviews
- 987
- Age
- 1y ago

Seagate Exos X22 22TB Internal Server Festplatte ST22000NM000C 3.5 Zoll HDD SATA 6Gb/s 512E SED 7200RPM 512MB Cache (Refurbished)
- Price
- £325.24
- Rating
- 4.2/5
- Reviews
- 183
- Age
- 1y ago

Seagate Exos 28TB internal server hard drive ST28000NM000C 3.5 HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed)
- Price
- £371.75
- Rating
- 4.2/5
- Reviews
- 128
- Age
- 1y ago

Seagate Enterprise 3.5 18000 GB 7200 RPM 18 TB 3.5 7200 RPM SATA ST18000NM00J (Renewed)
- Price
- £247.50
- Rating
- 4.2/5
- Reviews
- 156
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 67% of clicks. Leaders hold, but buyers still shop past them.
Brands
3 flat
Sellers
274
Est. top-5 brand share
100%
Top 20: 100%
Est. top-5 click share
67%
Top 20: 100%
Open market
0%
- Western Digital62%
- Seagate36%
- Toshiba3%
- Open — no brand owns it (0%)
Demand
18tb search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Nov · busiest ÷ quietest = 1.9×
Search terms
Top 18tb search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 18tb hard drive13K/yr
- 18tb6K/yr
- 18tb external hard drive4K/yr
- 18tb hdd4K/yr
Reviews and returns
What reviews say buyers love and hate about 18tb
We read the reviews and the return reasons for every product selling here.
“Total failure”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common 18tb questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









