Seagate pushes HAMR hard drives toward the next phase of AI-scale storage

The economics of artificial intelligence infrastructure increasingly depend on the ability to store vast volumes of data efficiently. Seagate’s latest Mozaic 4+ platform reflects how storage vendors are responding to this shift, positioning high-capacity hard drives as a foundational layer for hyperscale data centres.

Seagate says the new generation of its HAMR-based platform is now qualified and in production with two hyperscale cloud providers. The drives support capacities of up to 44TB, signalling continued industry momentum toward higher density storage as AI workloads expand across cloud infrastructure.

Hyperscale storage moves toward higher density drives

The Mozaic 4+ platform represents Seagate’s next step in scaling hard drive capacity without changing the fundamental architecture of enterprise storage systems. The company said the platform supports per-disk densities above 4TB today and is designed to scale toward 10TB per disk in future generations.

That roadmap could enable hard drive capacities of up to 100TB. The approach relies on incremental density improvements rather than disruptive redesigns, allowing operators to expand storage capacity while maintaining existing data centre infrastructure.

“Data has become one of the most valuable assets for enterprises, fuelling business insights, enhancing productivity, and enabling competitive advantage. As the foundation of modern data centre infrastructure, data storage solutions are essential to manage ever-increasing data volumes and maximise returns on investments in today’s AI driven-world,” said Dave Mosley, Seagate’s chair and chief executive officer. “Seagate’s HAMR-based Mozaic products deliver the scale, performance, and efficiency customers need to unlock the full potential of their data.”

Seagate said a majority of the world’s largest cloud storage providers have already qualified its Mozaic platform. That level of adoption highlights the role of mass-capacity hard drives in the broader economics of hyperscale infrastructure.

Vertical integration shapes HAMR production

One of the defining features of the Mozaic 4+ platform is Seagate’s vertically integrated photonics technology used in HAMR recording. The system relies on custom laser components that enable higher density magnetic recording on hard drive platters.

Seagate said these photonic components are designed and manufactured in-house, giving the company greater control over yield, reliability and supply chain stability. Vertical integration also reduces the complexity of qualification cycles, which can be critical when hyperscale operators deploy storage at large scale.

Years of investment in nanophotonic engineering underpin the technology, according to the company. The approach aims to balance density gains with the reliability requirements expected in enterprise data centre environments.

AI workloads drive demand for mass-capacity storage

Artificial intelligence workloads increasingly rely on large and persistent data stores. Training datasets, historical archives and AI-generated content continue to expand, creating pressure on storage infrastructure across hyperscale data centres.

Hyperscalers depend on mass-capacity hard drives to store and manage these data pools economically. According to Seagate, improvements in per-disk capacity allow storage infrastructure to scale without increasing data centre footprint or energy consumption.

The company said the platform improves capacity per rack and per watt, which can lower total cost of ownership for operators running large storage deployments. These improvements are also intended to support long-term data retention and reactivation for AI workloads.

In a one-exabyte deployment, Seagate said Mozaic could improve infrastructure efficiency by around 47% compared with standard 30TB deployments. The company estimates this could reduce required data centre footprint by roughly 100 square feet and lower annual energy consumption by about 0.8 million kilowatt-hours.

“As AI models have evolved and GenAI-powered applications have expanded their capabilities and reach, it’s become abundantly clear that the need for massive amounts of data—both real and synthetically generated—are essential to keep AI advancements moving ahead,” said Bob O’Donnell, President of TECHnalysis Research. “Whether for large-scale model training or sophisticated fine-tuning, companies who build and use these AI models have found that high-capacity hard drive innovations like HAMR have become critical to quality and speed of their outputs.”

Seagate said Mozaic 4+ drives with capacities up to 44TB are already shipping in volume to two hyperscale cloud providers. Broader availability is expected as production continues to scale.