As rising rack densities push cooling systems closer to their limits, Alex Segeda, Platforms Business Director, EMEAI at WD, explains why thermal resilience must be engineered into the storage infrastructure itself.

Data centre infrastructure is running hotter than it used to, and the causes aren’t hard to spot. AI workloads, expanding hyperscale storage and always-on digital services are driving growth at a pace few facilities were designed to accommodate. Compute and storage densities keep rising, but many thermal resilience strategies still rely on assumptions from an earlier generation of infrastructure.

That gap is turning into a real operational challenge. Higher rack densities, heavier power loads and tighter physical footprints are putting pressure on cooling systems that weren’t built with this level of density in mind. In environments where uptime isn’t optional, even modest temperature fluctuations can affect performance, increase energy costs or shorten the working life of hardware.

Operators planning for genuine resilience will need to stop treating thermal management as purely a facilities issue. It must also be addressed at the hardware level – through storage design, higher-capacity architectures and technologies that reduce heat generation at source.

Getting more capacity out of less space

There is a long-held perception that increasing storage capacity inevitably leads to higher heat output. Advances in enterprise HDD technology are changing this dynamic, however, by enabling organisations to store more data using fewer drives.

Higher-capacity HDDs allow operators to reduce the total number of drives required to achieve a given storage footprint. Fewer drives mean fewer mechanical components, lower aggregate power consumption and reduced thermal output at rack level. This is particularly relevant in hyperscale and cloud environments, where infrastructure is deployed at scale.

Enterprise HDDs are now available in capacities of up to 32TB within a standard 3.5-inch form factor, enabling organisations to increase storage density with only a minimal increase in thermal load.

At a time when data centre operators are under pressure to manage both cost and environmental impact, improving capacity efficiency alongside thermal resilience is becoming an important part of storage strategy.

Engineering hardware to run cooler by default

Cooling systems for servers and storage play a vital role in modern data centres. Increasingly, however, the industry is recognising that thermal resilience must also be considered in the design of the devices themselves.

This shift is contributing to developments in HDD design.

One example is helium-sealed HDD technology. Traditional air-filled drives experience higher levels of internal drag as spinning disks move through denser air. Helium is significantly less dense than air, reducing friction on rotating components.

This can lower power consumption and heat generation while supporting higher platter counts for increased capacity. Across large-scale deployments, the cumulative impact can contribute to improved energy efficiency and more stable operating conditions.

Power-optimised drives are also becoming increasingly relevant in modern cloud environments. Where workload requirements permit, drives designed to operate at lower spindle speeds can consume less power during operation and run cooler. While the reduction at individual drive level may appear incremental, the impact becomes more significant when drives are deployed across thousands of systems.

Every watt saved at the hardware layer can also reduce the cooling demand placed on the wider data centre environment. In high-density environments, this can support both operational efficiency and sustainability goals. Based on WD’s calculations, choosing 32TB HDDs rather than 26TB drives to deploy one exabyte (EB) of storage could reduce power consumption by 18.8%, with associated benefits for cooling demand.

Rethinking airflow systems

As infrastructure density increases, thermal resilience depends not only on individual components but also on how entire platforms are engineered.

Modern data centres operate in highly dynamic environments, where airflow disruption, uneven heat distribution and localised hotspots can affect efficiency even when individual components are running within acceptable ranges. Maintaining consistent airflow and stable temperatures across racks is therefore critical.

Platform-level design is becoming increasingly important in addressing this challenge. Improvements to airflow pathways can help maintain more consistent temperatures within the storage platform itself. By reducing airflow turbulence and minimising the recirculation of warm exhaust air, these architectures can help keep rack temperatures stable under demanding workloads.

Stable thermal conditions are important not only for hardware longevity but also for consistent system performance. Temperature variability can accelerate component wear, increase cooling overhead and introduce operational inefficiencies that scale quickly across large deployments.

Platform-based thermal optimisation can also support broader sustainability goals. As governments and enterprises place greater emphasis on energy efficiency and carbon reduction, operators are under increasing pressure to demonstrate more efficient use of infrastructure rather than simply increasing cooling capacity.

Bringing thermal resilience down into storage

Traditional thermal resilience models weren’t built for the pace at which cloud and enterprise infrastructure are now evolving. AI, hyperscale computing and increasingly data-intensive applications are pushing density growth to a point where legacy cooling approaches alone may struggle to maintain stable and efficient operations.

The response is therefore shifting, with thermal resilience increasingly being considered within the storage layer itself.

Higher-capacity drives mean fewer devices need to be deployed, reducing overall heat generation. Helium-sealed designs can reduce internal friction and improve energy efficiency. Power-optimised HDDs can help lower thermal output at scale, while platform-level design can help maintain stable rack temperatures as environments become denser.

The result is a broader shift in how the industry thinks about thermal management. It’s no longer only a cooling problem to be addressed after infrastructure has been deployed; it is increasingly becoming a consideration at the design stage as cloud-scale computing continues to evolve.