Toshiba is splurging 60 billion yen to expand HDD production, aiming to double its capacity, while Seagate Technology and Western Digital have suffered sharp declines.

Most U.S. stock storage-sector shares declined,$Seagate Technology (STX.US)$Down more than 14%,$Western Digital (WDC.US)$Down more than 10%,$SanDisk (SNDK.US)$Down more than 2%; the market has begun to reassess the supply-and-demand dynamics of the HDD industry in the context of AI data-center expansion.

On October 2, according to Nikkei, Toshiba plans to invest approximately 60 billion yen to expand its HDD plant in the Philippines, aiming to double its hard-drive capacity for AI data centers by the end of fiscal year 2027. For Seagate, this significant capacity expansion by a rival suggests that, despite the continued rapid growth in demand for high-capacity HDDs from AI data centers, industry supply will also increase in tandem. As a result, the currently tight supply‑demand balance may gradually ease, raising concerns that Seagate's future market share and pricing power could come under pressure.

Previously, the expansion of AI data centers has continued to drive strong demand for high-capacity HDDs. Despite SSDs costing roughly 20 times as much as HDDs, HDDs remain a key choice for large-scale data storage thanks to their cost advantage. In January this year, Seagate announced that its entire nearline HDD capacity for 2026 had already been sold out, underscoring that supply in the industry remains tight.

Toshiba's latest capacity expansion sends a clear signal: the surge in HDD demand driven by AI is far from over, yet manufacturers have already begun vying for market share by ramping up production and boosting per‑drive capacities. With Toshiba and Western Digital both stepping up their investments, the industry's focus is shifting from the pace of demand growth itself to whether this additional supply will disrupt the current tight balance in the HDD market.

Toshiba is investing a hefty 60 billion yen, doubling its HDD production capacity target.

According to reports, Toshiba plans to invest approximately 60 billion yen to expand its Philippine plant, marking the company's first major investment in its HDD business in roughly five years.

The expansion will include the addition of new production lines and the introduction of new products, boosting single-disk storage capacity by up to 40%. Toshiba will also continue to ramp up mass production of higher-capacity drives, aiming to achieve large-scale manufacturing of 65TB-class HDDs by 2030 and ultimately advancing toward 100TB-class products.

Toshiba is currently one of the three major players in the global HDD market, alongside U.S.-based Seagate Technology and Western Digital. By storage capacity, Toshiba's market share stands at just over 10%, and the company aims to increase this figure to 30% in the medium term.

In terms of production efficiency, Toshiba will also advance the automation of inspection processes and cleanroom operations at its Philippine plant, which is expected to reduce the additional manpower required for capacity expansion by approximately 40% while improving yield.

AI data is booming, and the HDD supply-and-demand landscape has entered a critical phase.

The surge in data volumes driven by AI model training, inference, and data center construction is steadily boosting demand for high-capacity nearline HDDs.

IDC forecasts that global annual data generation will grow roughly fourfold from 2024 levels, reaching 718 zettabytes (718 billion terabytes) by 2030, with approximately 60% of this data expected to be stored on HDDs.

Nearline HDDs constitute a high-capacity storage tier positioned between high-speed online storage and low-speed offline storage, and are increasingly becoming a critical component for AI data centers handling massive volumes of data. Given that SSDs are significantly more expensive than HDDs, HDDs continue to offer a distinct cost advantage in large-scale data‑storage deployments.

Strong demand has already begun to ripple through the supply chain. In January this year, Seagate announced that its nearline storage capacity for 2026 has been fully sold, indicating that AI data centers are securing HDD supplies well ahead of schedule.

Accordingly, the core impact of Toshiba's capacity expansion is not to alter the trajectory of growing AI‑related storage demand, but rather to potentially shift the supply‑demand balance in the HDD industry. As the additional capacity comes online gradually, the industry's bargaining power and high capacity utilization—currently sustained by tight supply—could come under pressure.

Western Digital ramps up its efforts, intensifying competition in the HDD market.

As Toshiba expands its production capacity, Western Digital is also ramping up its investments. The company plans to invest $1 billion in Japan by 2030, earmarked for next-generation technology R&D, talent recruitment, and collaboration with research institutions and universities.

For Toshiba, this capacity expansion is both a response to the growing demand driven by AI data centers and a key step toward increasing its market share. Currently, the company's market share, measured by storage capacity, stands at just over 10%, with an interim target of raising it to 30%.

Meanwhile, Toshiba's efforts to increase single-disk capacity and advance toward 65TB and even 100TB‑class products also mean that competition among HDD manufacturers will increasingly hinge on per‑terabyte cost and production‑capacity efficiency.

For Seagate, the biggest uncertainty at present is not whether AI‑related storage demand will grow, but rather whether the industry's tight supply‑demand balance can persist as competitors ramp up their offerings—and whether the company can maintain its market share and profitability throughout this growth cycle.

Editor/lambor