Why Western Digital and Seagate are seeing big stock drops today

Shares of Western Digital and Seagate fell sharply after reports that Toshiba plans to increase output of nearline hard drives—the high-capacity storage used in data centers running AI workloads. Investors read the news as a potential threat to the pricing power the two U.S. drive makers have enjoyed amid surging AI-related demand.

The logic is straightforward. Nearline drive supply has been tight, letting Western Digital and Seagate command stronger prices and protect margins. If Toshiba adds meaningful capacity, that balance could shift, giving large cloud buyers more leverage in negotiations. Because storage is a capital-intensive, cyclical business, even the prospect of looser supply can prompt investors to reassess earnings expectations quickly.

What to watch: whether Toshiba confirms specific capacity or timing, and how competitors respond. Also relevant are cloud providers' order patterns and any commentary from Western Digital and Seagate on pricing and lead times. For now, the selloff reflects anticipation rather than confirmed oversupply—an important distinction for anyone tracking the storage cycle.