[News] Seagate, Toshiba Reportedly Vie for TDK’s HDD Head Unit, a Key Independent Supply Source

As Toshiba moves to double HDD capacity by fiscal 2027 to capture booming AI data-center demand, it could be making another push to secure its supply chain. According to Bloomberg, the Japanese storage giant is battling Seagate for TDK’s magnetic-head business, a critical component for ramping HDD output.

Bloomberg, citing people familiar with the matter, notes that Toshiba opened talks with TDK in the spring, but the bidding heated up over the summer when Seagate entered with a higher offer. A potential deal could be worth several billion dollars, the sources said.

However, any transaction would also likely draw close antitrust scrutiny, as regulators increasingly view data-center storage capacity as strategically important to economic security, the report suggests.

The bidding battle comes as the global HDD market remains highly concentrated. TrendForce projects Western Digital to hold a 48% share in 2026, followed by Seagate at 42%, while Toshiba trails at 10%.

TDK’s Strategic Importance

That makes TDK a particularly strategic prize. Bloomberg notes that the winning bidder could gain greater pricing power and tighter control over a critical link in the HDD supply chain, potentially constraining rivals’ ability to ramp production as demand accelerates.

TDK, per Bloomberg, is the only independent supplier of magnetic recording heads—the components responsible for writing and retrieving data on hard drives—and currently supplies all three HDD giants: Seagate, Toshiba and Western Digital.

The stakes are especially high for Toshiba. As explained by Bloomberg, while Seagate and Western Digital manufacture magnetic heads in-house and turn to TDK mainly when demand spikes, Toshiba relies entirely on the Japanese supplier. Access to TDK’s technology is also critical to Toshiba’s plans to mass-produce high-capacity heat-assisted magnetic recording (HAMR) drives, a key part of its push to narrow the gap with its larger rivals, the report adds.

TDK Accelerates Strategic Shift

The potential sale also puts TDK’s broader portfolio shift in the spotlight. While the Tokyo-based company has benefited from booming demand for AI-related hardware, Bloomberg reports that it is weighing an exit from its volatile, historically low-margin HDD head business, which requires continuous investment to keep pace with advances in recording technology.

TDK is instead looking to redirect more resources toward batteries, passive components and sensors, seeking to strengthen its position in these businesses while capturing growing AI-driven demand from wearables such as smart glasses, Bloomberg notes, adding that a sale of the HDD head unit could also provide a sizable cash injection to accelerate those investments.

According to Kaisha Shikiho Online, the company has made “strengthening business portfolio management” a key pillar of its medium-term plan through fiscal 2026, with investment allocated based on return on invested capital (ROIC) and each business’s long-term growth prospects. Among its segments, magnetic application products currently post the lowest ROIC, at just 4%.

Read more

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• [News] AI Data Center Demand Revives HDD; Japanese Component Makers TDK, Resonac Expand Capacity

(Photo credit: TDK)