Traditional magnetic storage is resisting the onslaught of solid-state drives. While the consumer market has almost entirely embraced SSDs, mechanical hard drives remain the cornerstone of data centers and cloud service providers thanks to their durability. extremely competitive cost per gigabyte ratio.
In this context, Western Digital has unveiled a very aggressive roadmap in which the main objective is to put on the market HAMR 100TB hard drives around 2029This move marks a turning point for mass storage in Europe and the rest of the world, with an escalation in density that directly addresses the needs of data centers and cloud giants.
Roadmap: from 40 TB UltraSMR to 100 TB HAMR
According to the company's plans, the next big step will come with a 40 TB UltraSMR hard drive slated for the second half of 2026. This model combines energy-assisted perpendicular magnetic recording (ePMR) with advanced stripe recording techniques, an approach that WD calls UltraSMRand is already in the certification process with large-scale data center clients.
These initial 40 TB models serve as a bridge to much larger capacities. The company plans to extend the ePMR technology to... 60 TB per unitpushing the limits of what can be achieved with current recording methods before making the definitive leap to heat-assisted magnetic recording (HAMR)which will be the basis of the 100 TB drives.
Western Digital's plan involves starting the Certification of the first HAMR units in 2027This first generation will already exceed 40 TB, placing it in the high end of the professional market, with a view to rapidly scaling up to 60 TB capacities and, within less than three years of its introduction, reaching the symbolic goal of... 100 TB per unit.
To achieve this, the company is working on new magnetic media and unified platforms that allow the integration of HAMR-derived innovations into the ePMR and UltraSMR lines without a surge in energy consumption, a factor that particularly concerns European data center operators due to their electricity costs and risks of power outages and sustainability goals.
HAMR technology: record densities and a leap in generation
Technology HAMR (Heat-Assisted Magnetic Recording) It is presented as the key to breaking the physical limitations of conventional magnetic recording. The principle is to use localized heat, usually generated by a tiny laser, to facilitate the writing heads on magnetic media of higher coercivity, thus allowing store more bits on the same surface without losing long-term stability.
In the most advanced architectures that Western Digital is preparing, the HAMR drives initially aim to offer around 4 TB per plateHowever, medium-term projections point to means capable of achieving 10 TB per platter in configurations of up to 14 plattersThis would place the technical ceiling at around 140 TB per unit if the roadmap is met.
To get there, the company works with next generation magnetic alloys, such as those based on platinum iron (FePt), which allow for areal densities far exceeding current capabilities. Combined with spot heating systems and a refined head design, these alloys form the physical basis that will make future 100 TB hard drives and beyond viable.
All this development is being carried out with one eye on cost and the other on compatibility. Western Digital insists that its approach will allow for a gradual transition for hyperscalers and large companiesavoiding disruptive changes to infrastructure and software. The idea is that each customer can adopt ePMR, UltraSMR, or HAMR according to their own schedule, maintaining predictable capacity planning.
High Bandwidth Drive and Dual Pivot: More bandwidth without sacrificing capacity
With the massive increase in hard drive capacity, another problem arises: how to prevent performance from falling behind. To address this, Western Digital is introducing two innovations that complement HAMR: High Bandwidth Drives and the technology of Dual Pivot.
The concept of High Bandwidth Drive aims to read and write simultaneously from multiple printheads on different tracks of the disc, thus making better use of the drive's mechanical potential. The company has already demonstrated prototypes capable of delivering a bandwidth of approximately double that of a conventional hard drive, and its stated goal is to multiply that performance by up to eight by 2030.
For its part, technology Dual Pivot It introduces a second set of independently controlled actuators within the classic 3,5-inch form factor. This allows the heads to operate in parallel on different areas of the disk, which in practice doubles the sequential transfer speed without the disadvantages of older dual actuator designs, such as loss of usable capacity or the need for deep changes to the customer's software.
The combination of HAMR, High Bandwidth Drive, and Dual Pivot is designed so that future 40, 60, and 100 TB drives will not only offer more storage space, but also... performance in line with the demands of current workloadsfrom large data lakes to streaming services and real-time analytics.
Impact on European data centers and the professional market
The push towards 100 TB hard drives comes at a time when data centers in Spain and the rest of Europe are facing sustained growth in traffic and the volume of stored information. Sectors such as banking, public administration, telecommunications, and data science depend on a scalable and predictable massive storage capacitywhere each increase in density can translate into significant savings in physical space and energy consumption.
Furthermore, the market has experienced in recent years voltages in the flash memory supply And price fluctuations have further reinforced the appeal of the traditional hard drive for large volumes of data, whether cold or warm. Although SSDs dominate the consumer PC market and a significant portion of high-performance servers, HDDs remain the primary choice for file storage, backups, and large content repositories.
Western Digital, as one of the world's leading hard drive suppliers, indicates that its planned production capacities for 2026 are practically complete. committed through agreements with their major clientswith commitments extending even into 2027 and 2028. Within those shipments, UltraSMR-based units already account for more than half of current volumes.
For data center operators in the EU, the staggered arrival of 40, 60 and up to 100 TB models means power Increase density per rack without multiplying infrastructure complexityA smaller number of units for the same capacity means fewer racks, less cabling, less aggregate power consumption, and, overall, a more manageable environment.
Cost advantage over QLC SSDs and scenario for 2029
Another key point of Western Digital's strategy is to maintain a clear cost advantage over QLC memory-based solid-state drivesAccording to the company's own estimates, the combination of ePMR, UltraSMR and HAMR technologies allows it to maintain a cost/capacity ratio between six and ten times higher compared to SSDs of equivalent capacity.
This difference is especially relevant for public cloud providers, hosting services, and businesses that continuously manage massive volumes of data. While SSDs will continue to gain ground in segments where latency and performance are critical, High-capacity magnetic storage will continue to be the economic foundation which many hybrid architectures and storage hierarchies rely on.
Looking ahead to 2029, WD's plan fits into a broader trend in the hard drive industry: pushing the 3,5-inch format to its limits in terms of density and bandwidth, while maintaining compatibility with existing infrastructure. The first HAMR drives will exceed 40 TB and scale rapidly to 60 TB, with the stated goal of reaching 100 TB in less than three years from the start of mass production.
If the deadlines are met, European data centers could begin the progressive migration towards three-digit HAMR units Towards the end of the decade, these solutions were combined with SSDs for the most performance-sensitive data layers. The result was a new generation of platforms where capacity was no longer the primary bottleneck, and the focus shifted to performance, energy efficiency, and intelligent data orchestration.
Everything points to the coming years being decisive for magnetic storage: between the maturation of UltraSMR, the arrival of HAMR, and bandwidth improvements like Dual Pivot, hard drives still have a long way to go to remain a central component of the data ecosystem, and the 100 TB models planned for 2029 They are emerging as a new benchmark for large-scale mass storage.
