Western Digital
WD_BLACK SN850 Spec and Price in the United Kingdom
NVME1TBM.2 22807000 MB/s read
Released October 8, 2020
WD_BLACK's Gen4 flagship before the X revision runs 7,000/5,300 MB/s on TLC NAND with a DRAM cache, per the documented listings — the PS5-compatible performance pick that the SN850X later succeeded at the same speed class.
Tied 34th of 106 models in the SSD catalog on Sequential read — 9 models share this figure. 41st of 106 models in the SSD catalog on Sequential write.
Current best price
Prices include VAT.
Captured periodically and may have changed.- 1TB
- 2TB
June 15, 202660 capturestoday · £391.29
Each point is one capture, not a list price. How we track prices
Specifications
- Capacity
- 1TB
- Interface
- NVME
- Sequential read
- 7000 MB/s
- Sequential write
- 5300 MB/s
- PCIe generation
- 4
- Form factor
- M.2 2280
- NAND type
- TLC
- DRAM cache
- Endurance (TBW)
- 600 TB
- Warranty
- 5 years
Capacities
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
- Competitive performance with a large dynamic cache that recovers quickly, in an attractive design with a useful software package.
Commonly criticised
- Can run hot under sustained load, with high idle power draw and no hardware encryption.
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.