ST18000NM0012 Seagate Exos X18 18TB SAS 256 MB 3.5" Server HDD

Product line:

Exos

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Happyware Article Number:

SH8H2497-673489

Manufacturer Number:

ST18000NM0012

Brand:

Seagate

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Description Technical details Warranty & Technical Support Reviews Bulk Deals

ST18000NM0012

High-Density 3.5-inch Enterprise SAS Nearline HDD architecture with the ST18000NM0012

The ST18000NM0012 is a 3.5-inch Seagate Exos X18 enterprise HDD engineered for SAS-attached nearline tiers where capacity density, predictable latency, and 24x7 duty cycles are mandatory in server RAID groups and JBOD shelves. In modern CPU-centric storage nodes, the ST18000NM0012 complements PCIe-based expansion by keeping high lane budgets for NICs, HBAs, and accelerators while delivering scalable bulk storage through a single-port SAS topology.

Using CMR recording and a 7200 RPM design, the ST18000NM0012 supports consistent rebuild behavior under RAID and erasure-coded object storage, reducing operational risk compared to write-amplifying formats. Dual-actuator mechanics and a 256MB cache help sustain sequential throughput for backup repositories and cold-to-warm data tiers. Flexible 512e/4Kn sector formatting allows alignment to host memory and filesystem block sizes, while Seagate Secure SED with Instant Secure Erase (ISE) integrates into key-management workflows for decommissioning and multi-tenant compliance.

Why Choose the ST18000NM0012?

The ST18000NM0012 targets high-bay storage where rack-unit economics and serviceability drive architecture: 18TB per drive enables fewer spindles per petabyte, cleaner airflow, and simpler power planning in dense enclosures. With 2.5M hours MTBF and helium sealing, the ST18000NM0012 is designed for fleet-scale deployments requiring stable thermals, hot-plug maintenance, and predictable scaling across nodes and shelves.

Seagate designs Exos platforms around sustained enterprise workloads, emphasizing vibration-tolerant mechanics, consistent firmware behavior, and reliability metrics aligned to modern data centre operational standards. PowerChoice/PowerBalance features support policy-driven power management without compromising availability targets.

Key Applications:

Data centre bulk storage
Scale-out and object storage
RAID arrays in servers and JBOD enclosures
Backup and repository platforms
Cold-to-warm data tiers

At Happyware - Server Hardware you benefit from bulk order discounts that match fleet refresh and expansion projects for the ST18000NM0012, and you can register to receive a non-binding offer tailored to your enclosure, HBA, and sector-format requirements.

Technical details of ST18000NM0012

Capacity:

18TB

Form Factor:

3.5"

Interface:

SAS

Rotations:

7200RPM

Cache:

256 MB

How long is the Warranty and how you can get technical support for ST18000NM0012

Warranty:	36 months (part)
RMA through customer:	yes
RMA Url:	https://www.seagate.com/support/warranty-and-replacements/
Description:	Items must be returned first for RMA. Advanced replacement is not available. No guaranteed delivery times specified. On-site service is not offered as standard. The warranty does not cover data loss. Regular data backups are recommended