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Silver 3.5 inch enterprise hard drive with SAS connector and helium-sealed label

Seagate

Seagate Exos X18 ST16000NM004J 16TB SAS 7200 RPM 256MB 3.5" internal hard drive

SKU CH-AGKX-BCED2 MPN ST16000NM004J

Enterprise 16 TB SAS drive with 7200 RPM, 256 MB cache and helium-sealed CMR design for servers and storage arrays

  • Total capacity16 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • Recording methodCMR

Model 16TB Exos X18

  • 16 TB capacity stores massive datasets
  • SAS 12 Gb/s interface delivers 261 MB/s sustained throughput
  • Helium-sealed design reduces drag for efficient 7200 RPM operation
  • CMR recording technology ensures consistent write performance
  • 256 MB cache accelerates burst workloads in enterprise arrays

Capacity and interface

The Seagate Exos X18 ST16000NM004J is a 16TB enterprise hard drive with a SAS 12Gb/s interface and 7200 RPM spindle speed. It uses CMR recording technology and a helium-sealed design for high-capacity storage in servers, storage arrays and workstation computers. The 256MB cache supports sustained throughput for demanding workloads.

Sustained workload behaviour

Sustained data transfer rate reaches up to 261 MB/s during continuous operation. The helium-sealed design reduces internal turbulence and helps maintain consistent performance under heavy load. Idle Power Management and Power Efficiency Optimization lower power draw during quieter periods. Digital environmental sensors monitor operating conditions in real time.

Installation and common issues

The 3.5-inch form factor fits standard enterprise drive bays and backplanes using the SAS connector. Installers must verify that the host controller supports SAS 12Gb/s and the required sector format, either 512e or 4Kn. A missing or mismatched controller is the most common reason the drive is not recognised. Adequate airflow in the chassis is needed to keep the helium-sealed unit within thermal limits.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $339.99
Pricier than about 85% of the 4,938 comparable items (median $107.99).
Total capacity 16 TB
Higher than about 92% of the 2,372 comparable items (median 2 TB).
Price per TB $21.25 per TB
Cheaper than about 92% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos X18
Model nameST16000NM004J
Part number2TW203-004
Total capacity16 TB
Performance
Rotational speed7,200 RPM
Storage
Cache memory256 MB
Recording methodCMR
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.64 kg
Package size206 × 152 × 25 mm

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