Seagate 44TB Hard Drives Revealed (ST4400NM002M)
Seagate Shows Off It’s 44TB Hard Drive at NAB 2026
At the 2026 NAB Show 2026, Seagate Technology formally introduced its latest generation of high-capacity enterprise hard drives built on the Mozaic 4+ platform. These drives, (model ID ST4400NM002M) reaching up to 44TB, represent the current peak of commercially deployed hard disk capacity and are already being shipped to select hyperscale cloud providers. The announcement reflects ongoing demand for higher-density storage as data generation continues to accelerate, particularly in artificial intelligence and large-scale cloud environments.
Rather than targeting general consumers, these drives are designed specifically for hyperscale data centres where efficiency, density, and cost per terabyte are critical considerations. The Mozaic 4+ platform is also notable for its reliance on heat-assisted magnetic recording (HAMR), a technology that has moved from experimental development into production-scale deployment. With broader qualification underway, the 44TB model serves as both a milestone in current storage capabilities and a step toward projected capacities approaching 100TB in future generations.

Everything we know about the Seagate 44TB Hard Drives
The 44TB drives are built on Seagate’s Mozaic 4+ platform, which represents the company’s production-ready implementation of heat-assisted magnetic recording (HAMR). Unlike earlier perpendicular magnetic recording approaches, HAMR uses localized heating via a nanophotonic laser to temporarily reduce the coercivity of the disk surface, allowing data to be written at much higher densities. This enables significantly greater areal density without requiring a complete redesign of the underlying hard drive architecture, allowing Seagate to scale capacity incrementally across generations.
At a physical level, the drives use a multi-platter design, widely understood to consist of 10 platters, each delivering over 4TB of capacity. This results in the total 44TB figure within a standard 3.5-inch enterprise form factor. The spindle speed is expected to remain at 7200 RPM, consistent with other enterprise-capacity drives, balancing throughput, reliability, and power consumption. Early estimates suggest sustained transfer rates in the region of 300 MB/s, though final performance characteristics depend on deployment conditions and firmware tuning. I think we are likely much more liekly to hit 280MB/s or so, such as you find in the 30TBs.

A key aspect of the Mozaic 4+ design is its vertically integrated photonics system. Seagate has developed its own laser components in-house, embedding them directly into the recording head. This allows precise, nanosecond-scale heating during write operations, which is critical for maintaining data integrity at such high densities. Vertical integration also gives Seagate tighter control over manufacturing consistency, yield, and long-term reliability, all of which are essential when deploying drives at hyperscale volumes.
The recording stack itself incorporates several advanced components. These include a Gen 2 superlattice platinum-alloy media designed for improved magnetic stability, a Gen 2 plasmonic writer responsible for delivering the heat-assisted write process, and a Gen 8 spintronic reader that improves read accuracy from increasingly smaller data bits. Together, these components enable higher density while maintaining error rates and durability within enterprise requirements.

Supporting these physical advancements is a 7nm integrated controller, which manages drive operations with improved precision. This controller enhances servo control, allowing the read/write heads to maintain accurate positioning over narrower tracks. It also contributes to improved power efficiency, reducing watts per terabyte and helping data centres optimize energy usage at scale. These gains are particularly relevant in large deployments where power and cooling costs scale with capacity.
From a manufacturing perspective, the Mozaic platform is designed to scale without requiring disruptive architectural changes between generations. Each iteration builds on existing processes, allowing Seagate to increase per-platter capacity over time. The company has indicated a roadmap toward 10TB per platter, which would enable drives approaching 100TB within a similar physical footprint. This approach prioritizes continuity in deployment while steadily increasing storage density.
| Specification | Details |
|---|---|
| Platform | Mozaic 4+ |
| Recording Technology | HAMR (Heat-Assisted Magnetic Recording) |
| Maximum Capacity | 44TB |
| Form Factor | 3.5-inch |
| Number of Platters | 10 |
| Capacity per Platter | 4TB+ |
| Spindle Speed | 7200 RPM (expected) |
| Recording Method | CMR |
| Estimated Throughput | ~300 MB/s (speculative) |
| Target Market | Hyperscale data centres |
| Controller | 7nm integrated SoC |

Seagate 44TB HDDs – SMR or CMR?
Despite the push toward higher capacities, the 44TB drives based on the Mozaic 4+ platform use conventional magnetic recording (CMR) rather than shingled magnetic recording (SMR). This distinction is relevant because SMR typically achieves higher capacities by overlapping data tracks, which can negatively impact rewrite performance and latency in certain workloads. By retaining CMR, Seagate is prioritising predictable performance characteristics, particularly for enterprise environments where consistent throughput and low latency are required.
This approach also differentiates Seagate’s offering from competing high-capacity drives, such as those being developed by Western Digital, which have explored SMR and related technologies like UltraSMR to reach similar capacity points. While SMR can be effective for archival or sequential workloads, CMR remains better suited to mixed or write-intensive applications commonly found in hyperscale deployments. In this context, the use of HAMR allows Seagate to increase density without relying on SMR trade-offs, maintaining compatibility with existing data centre workloads and software stacks.

The introduction of 44TB hard drives based on the Mozaic 4+ platform reflects a continued focus on increasing storage density within the constraints of existing data centre infrastructure. By combining HAMR with incremental architectural improvements, Seagate Technology has demonstrated that higher capacities can be achieved without fundamental changes to form factor or deployment models. The emphasis remains on scaling capacity per rack and per watt, which aligns with the operational priorities of hyperscale environments.
At the same time, these drives remain firmly positioned within enterprise and cloud use cases, with limited relevance to consumer or small-scale storage in the near term. Factors such as cost, workload requirements, and integration complexity restrict their adoption outside large data centres. However, as with previous generations, advancements at this level are likely to influence broader storage markets over time, particularly as manufacturing scales and newer technologies mature.

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