Why Western Digital Stock Just Crashed

WDC dropped 11.7% after reports that rival Toshiba plans to spend $400 million to double its HDD production capacity by fiscal 2027. The move sets up a direct threat to WDC's pricing power and a read-through for STX, the other named HDD player in focus.

Toshiba's expansion could lift its market share from 17% to 30%, a 13-point swing that would pull volume from incumbents. Interpretation: that scale of added supply raises the odds of price competition, which would pressure margins at WDC and potentially STX if rivals chase share.

The sell-off may be overdone, according to analysts cited in the source. WDC trades under 18x earnings, a valuation they argue already prices in a degree of competitive risk. That sets up a tension between a long-dated supply threat and a near-term pullback that some see as excessive.

Timing matters here. Toshiba's capacity doubling runs through fiscal 2027, so the margin impact is a forward risk rather than an immediate earnings hit. Interpretation: the market may be pricing years of potential compression into a single session.