Seagate ST18000NM000D · Exos X20 18TB

Model code

ST18000NM000D

Identifier scope

Official model designation, not a verified ordering part number. Region, revision and bundle require separate confirmation.

Manufacturer model

Exos X20 18TB

Capacity

18TB

Interface

SAS 12Gb/s

Form factor

3.5-inch; 26.1mm maximum height

Rotation speed

7200 rpm

Buffer

256 MB

Recording technology

CMR

Drive design

Helium sealed

Sector format

512e/4Kn FastFormat; ships in 512e state

Security / variant

Standard

Interface ports

Dual

Max sustained transfer rate OD

285 MB/s (272 MiB/s)

Power-on rating

8760 hours/year

MTBF

2,500,000 hours (population statistic)

Average latency

4.16 ms

Average Idle A power

5.8 W

Operating temperature

5–60°C

Documented selection limits

Check exact SATA/SAS host and backplane, drive dimensions, sector format, firmware and security requirements. SED/FIPS variants can require a TCG-compatible controller and vary by region. No stock, lifecycle or universal compatibility promise; MTBF is a population statistic, not the lifespan of a particular drive. FastFormat conversion deletes all data. Verify exact sector format and host alignment before use.

Specification source: Seagate ↗
Checked against documentation: 17.10.2026

“Up to” figures follow manufacturer test conditions; real throughput depends on workload and host system.