ST12000NM000J Seagate Exos X18 12TB SATA 256 MB 3.5" Server HDD

Product line:

Exos

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Happyware Article Number:

SH5H9636-550052

Manufacturer Number:

ST12000NM000J

Brand:

Seagate

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Description Technical details Warranty & Technical Support Reviews Bulk Deals

ST12000NM000J

High-Capacity 3.5in Enterprise HDD for SATA Capacity Tiers with the ST12000NM000J

The ST12000NM000J is a 12TB 3.5in enterprise HDD engineered for data centre capacity tiers where predictable latency, sustained throughput, and 24x7 duty cycles are required across dense SATA storage planes. In modern server and storage architectures, the ST12000NM000J complements CPU-centric platforms by providing cost-effective bulk capacity for file services, object repositories, and VM backup sets while leaving PCIe lanes and memory channels available for compute acceleration and high-speed caching.

Designed for integration in RAID arrays and JBOD shelves, the ST12000NM000J uses CMR recording and 7200RPM mechanics to maintain consistent write behaviour under rebuild and scrub operations. The SATA interface supports wide compatibility across HBA backplanes and storage controllers, while Advanced Format options (512e/4Kn) simplify alignment with OS and hypervisor sector requirements. A 256MB cache helps smooth burst traffic in mixed workloads, enabling efficient staging from NVMe tiers and DRAM cache to high-capacity disks.

Why Choose the ST12000NM000J?

The ST12000NM000J delivers a strong density-to-slot profile for scalable capacity pools, enabling predictable expansion without changing server chassis or shelf footprints. With enterprise-class reliability design targets and a 2.5M-hour MTBF rating, the ST12000NM000J is suited for standardised deployments where operational consistency, serviceability, and long-duration uptime are mandatory.

Seagate designs Exos-class drives with a focus on sustained data centre operation, qualification for multi-drive enclosures, and alignment with modern storage standards for sector formatting and controller interoperability. This engineering approach supports stable integration into automated provisioning and monitoring environments.

Key Applications:

Data centre bulk storage tiers
RAID arrays and rebuild-intensive pools
JBOD expansion shelves
Backup and archival repositories
General-purpose server storage

At Happyware - Server Hardware you benefit from bulk order discount options for large storage rollouts and the ability to request non-binding offers tailored to your capacity planning, controller compatibility, and deployment timelines.

Technical details of ST12000NM000J

Capacity:

12TB

Form Factor:

3.5"

Interface:

SATA

Rotations:

7200RPM

Cache:

256 MB

How long is the Warranty and how you can get technical support for ST12000NM000J

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