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

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.