According to Woofun AI, Bernstein strongly refuted recent market fears in the October 7, 2026 report, arguing that the dispute over the ownership of TDK's magnetic head business did not constitute a substantial threat to Seagate (STX.US) and Western Digital (WDC.US), and that the current reaction of 9% and 7% in a single day in stock prices was a serious mistake.
Although Bloomberg previously reported news that Seagate and Toshiba compete for TDK's magnetic head business, raising market concerns about supply chain breakdowns and worsening competition, Bernstein maintained Seagate and Western Digital's outperforming ratings and gave target prices of $1,350 and $770, respectively. The agency's core logic is that multiple barriers such as regulatory scrutiny, financing restrictions, and supply self-sufficiency make the probability that any acquisition deal will land extremely low, and even if the deal is completed, its direct impact on the two giants is far less than expected by the market.
In response to the three main concerns about market formation, Bernstein dismantled them one by one. First, the view that Toshiba's capacity expansion could threaten Seagate's and Western Digital's position has been exaggerated. Even if Toshiba acquired TDK's assets, its share of the EB-caliber mechanical hard drive market was only about 11%. Even though its EB production capacity doubled, and Seagate and Western Digital each increased 25%, Toshiba's EB share only increased from 11.2% to 16.8%. Bernstein believes that this 5.6 percentage point increase in share does not pose a significant threat, and that the acquisition of TDK mainly guarantees Toshiba's own supply of magnetic heads, rather than directly increasing hard drive manufacturing or head production capacity. Second, concerns about TDK's criticality about Seagate and Western Digital are also untenable.
According to data compiled by Woofun AI, TDK's share of the global hard drive head market is only 15% to 20%, with the remaining 80% to 85% produced by Seagate and Western Digital. Toshiba alone absorbed 70% to 90% of TDK's magnetic head production because of the low capacity of its hard drives per disc, accounting for 14% of the demand for magnetic heads. The remaining portion covers only 1% to 7% of Seagate and Western Digital's combined magnetic head requirements. Seagate clearly stated in the application document that the company designs and manufactures many key technologies, including reading and writing magnetic heads; Western Digital also indicated in the application document that it designs and manufactures almost all recording heads and magnetic recording media. Therefore, TDK is only marginally important and not a core source.
Furthermore, anti-monopoly regulatory barriers, Toshiba's financial shortcomings, and poor execution records further weakened the viability of the transaction. TDK is the only independent manufacturer among the three hard drive head manufacturers, and any successful bid will trigger strict antitrust scrutiny, as it means that the acquirer controls the competitor's input of critical components. The Seagate TDK combination is unlikely, as it would place more than half of the world's magnetic head output under one, with Seagate accounting for more than 40% and TDK accounting for 15% to 20%, causing Toshiba and Western Digital to lose purchasing options. Although the combination of Toshiba and TDK is relatively likely, Toshiba can still obtain pricing power and limit Seagate and Western Digital's production capacity increases during periods of storage shortages.
The more critical variable is Toshiba's own capital structure. Its corporate bonds have been graded BB by S&P, and the multi-billion dollar acquisition of TDK will increase existing debt and a potential proposed capital expenditure of $380 million. Given Toshiba's weak financial situation and weak execution of the hard drive business, Bernstein believes the deal could be a strategic mistake. In the past, Toshiba's execution record in the hard disk business was poor, capacity expansion and technology iteration were slower than in the industry, making integration extremely difficult.
Based on the above analysis, Bernstein suggested buying Seagate and Western Data in the midst of weakness, with Seagate being the first choice. Seagate's target price of $1,350 is based on 21x FY28 earnings of $64.40 per share. Improved fundamentals, a five-year compound annual growth rate of more than 70% in earnings per share, and HAMR's leading position are sufficient to support the valuation. Western Digital's target price of $770 is also based on 21x FY28 earnings per share. It is basically self-sufficient in HAMR technology. After the spin-off, the magnetic head business remained self-sufficient, and its marginal dependence on TDK was lower than market concerns. On the risk side, the two companies are under pressure to absorb hyperscale cloud capital expenses, changes in the procurement model of hyperscale vendors, and improvements in NAND technology to seize the share of hard drives. Western Digital also faces the risk that HAMR technology transformation could drag down gross margins and earnings per share. If the procurement model of hyperscale manufacturers shifts, demand for hard drives will be directly pressured. However, due to regulatory scrutiny and Toshiba's financial pressure, the probability that the TDK deal will pass is low, and the two companies' supply of magnetic heads is safe and controllable.