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Western Digital

WD_BLACK SN7100 Spec and Price in the United Kingdom

NVME2TBM.2 22807250 MB/s read

Released November 21, 2024

Released in late 2024, the SN7100 replaces WD_BLACK's DRAM cache with a 4-channel Polaris 3 controller and host memory buffer, yet still matches the SN850X on sequential speed at 7,250/6,900 MB/s and actually edges ahead on random write IOPS at 1.4 million. That combination of DRAM-less efficiency and gen4 flagship-level throughput makes it the leaner, newer alternative within the WD_BLACK line for gamers who don't need a physical cache chip. Endurance and warranty terms carry over unchanged at 1,200TB and 5 years.

Tied 26th of 106 models in the SSD catalog on Sequential read — 3 models share this figure. Tied 16th of 106 models in the SSD catalog on Sequential write — 4 models share this figure.

Current best price
From £89.99at Amazon.co.uk · captured 2026-09-15 · £179.98/TBView at Amazon.co.uk

Prices include VAT.

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 500GB
  • 1TB
  • 2TB
  • 4TB
July 5, 2026120 capturestoday · £472.00

Each point is one capture, not a list price. How we track prices

Specifications

Capacity
2TB
Interface
NVME
Sequential read
7250 MB/s
Sequential write
6900 MB/s
Random read
1000000 IOPS
Random write
1400000 IOPS
PCIe generation
4
Form factor
M.2 2280
NAND type
TLC
DRAM cache
Controller
WD/SanDisk in-house Polaris 3 (4-channel, DRAM-less)
Endurance (TBW)
1200 TB
Warranty
5 years

Capacities

ConfigurationPart numberEndurance (TBW)Sequential writeSequential readCurrent best pricePrice per TB
500GBWDS500G4X0E-00CJA0300 TB5800 MB/s6800 MB/s
£89.99

at Amazon.co.uk · captured 2026-09-15

£179.98/TB
1TBWDS100T4X0E-00CJA0600 TB6900 MB/s7250 MB/s
£159.93

at Amazon.co.uk · captured 2026-09-02

£159.93/TB
2TBWDS200T4X0E-00CJA01200 TB6900 MB/s7250 MB/s
£252.00

at Amazon.co.uk · captured 2026-09-15

£126.00/TB
4TBWDS400T4X0E-00CJA02400 TB6700 MB/s7000 MB/s
£472.00

at Amazon.co.uk · captured 2026-09-13

£118.00/TB

Guides for this category

How to choose an SSDFour questions decide almost every SSD purchase — what fits, how big, how fast, and how much it should cost.NVMe or SATAWhich interface your machine takes, how to tell without opening it, and what the speed difference actually buys you.How much SSD capacity you actually needHow to size a drive from what you already use, why leaving headroom matters, and when one bigger drive beats two small ones.M.2 sizes and SSD form factorsWhat 2280, 2242, and 2.5-inch mean, which one your machine takes, and how to check the keying before you buy.What SSD speed numbers actually tell youSequential versus random performance, why the number on the box describes the rarer case, and how to read it without being misled.PCIe generations for SSDsWhat Gen 3, Gen 4, and Gen 5 change, why a newer drive always works in an older slot, and when the extra speed is worth paying for.TLC, QLC, and DRAM-less SSDsWhat the NAND type and the controller's cache change about how a drive behaves, and when either is worth caring about.SSD endurance and warrantiesWhat TBW and DWPD actually promise, how much a normal machine writes, and when endurance is worth paying extra for.How to install an SSDFitting an M.2 or 2.5-inch drive, choosing between cloning and a clean install, and what to check on the first boot.When an SSD price is actually goodWhy price per terabyte beats any discount percentage, and why a good price on one capacity says nothing about the others.

What owners and reviewers say

Summarised from 1 source(s), reviewed September 13, 2026. A source is counted only where it names this model exactly. How we track prices

Commonly praised

  • Extremely power-efficient with excellent random read performance.

Commonly criticised

  • Mediocre all-around performance, no largest-capacity model at launch, and priced above its sibling at review time.

Sources behind this summary

Sources

Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.