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Seagate

Seagate Exos X20 Spec and Price in the United Kingdom

SATA20TB7200 RPM

Exos X20 is Seagate's 18-20TB enterprise nearline generation: helium-sealed 7200rpm mechanics, 256MB of cache, a 550TB/year workload rating, and a five-year warranty, per the Seagate data sheet. Sustained throughput reaches 285 MB/s — the top of the SATA hard-drive envelope — and the CMR recording keeps it safe for every RAID level. On SATA it is a dense, dependable data-center capacity tier, and the price per terabyte is the argument for it.

Current best price

No tracked price — this page compares specifications alone.

Specifications

Capacity
20TB
Interface
SATA
Sequential read
285 MB/s
Sequential write
285 MB/s
Rotation speed
7200 RPM
Form factor
3.5-inch
Cache
256 MB
Warranty
5 years

Capacities

ConfigurationPart number
20TBST20000NM007D

Guides for this category

How much hard drive you actually needWhat a mechanical drive is still for beside an SSD, how to size it for the pile you are offloading, and why a cheap high-capacity drive can be slow.Portable vs desktop hard driveWhat the enclosure decides between a bus-powered 2.5-inch drive and a mains-powered 3.5-inch one, and why an external listing carries fewer numbers.

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

  • At launch the highest-capacity enterprise drive available, rated for a very long mean time between failures under a five-year warranty.
  • Street pricing came in substantially below the mechanically similar NAS drive.

Commonly criticised

  • Consistently underperformed the mechanically identical NAS drive in benchmarks, with higher random latency.

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.