Western Digital Corp. (WDC) closed at an all-time high of $746.23 on Thursday, capping a week of extraordinary gains driven by insatiable demand for hard disk drives (HDDs) from AI data centers. The stock rose 4.79% on the final trading day before the Juneteenth holiday, ending the four-session week up 32.6%, far outpacing the Nasdaq Composite's 2.43% gain over the same period.
The rally pushed WDC well above the average 12-month analyst price target of $554.13, based on a poll of 23 analysts. Even the most recent upgrade from Morgan Stanley's Erik Woodring, who raised his target to $650 from $488 while maintaining an Overweight rating, still sits below the current share price. Woodring highlighted HDDs as the "cleanest estimate revision and re-rating story" in hardware, citing a supply-demand imbalance that favors manufacturers.
AI Demand Driving Structural Shift
Industry commentary from both Western Digital and rival Seagate Technology underscores the scale of the shift. Western Digital CEO Irving Tan told investors in April that "virtually every AI workload" generates data requiring persistent storage, and that demand drivers are clear. The company reported fiscal third-quarter revenue of $3.34 billion, up 45% year-over-year, and guided fourth-quarter revenue to approximately $3.65 billion. Seagate CEO Dave Mosley echoed the sentiment, stating that "AI is amplifying demand across existing applications." Both companies have sold out their HDD capacity through the end of calendar 2026, according to Reuters.
The market's enthusiasm reflects a structural shortage. Woodring projects HDD demand growing 40% to 50% annually, while supply is expected to expand only 30% to 35%. This gap has created pricing power that is driving earnings revisions higher across the storage sector. The Philadelphia Semiconductor Index jumped 6.4% on Thursday, with chip stocks broadly strong, but WDC's weekly gain more than doubled that of the benchmark.
Corporate Restructuring Provides Clarity
Western Digital's strategic separation of its flash memory business, completed in 2025, has sharpened its focus on HDDs. The company now operates as a pure-play HDD manufacturer serving cloud, client, and consumer markets, while its former flash unit trades independently as Sandisk. This simplification has made WDC a more direct beneficiary of the AI storage narrative, as investors can now bet exclusively on the HDD cycle without exposure to the more cyclical NAND flash market.
The rally has also lifted Seagate shares, providing a strong read-through for the storage group. Both companies are benefiting from cloud providers' aggressive buildout of AI inference infrastructure, which generates and stores massive datasets. MarketWatch noted that the demand surge is not limited to training models but extends to ongoing inference operations that require persistent storage for retrieval-augmented generation and other applications.
Risks Loom at Elevated Valuations
Despite the bullish sentiment, risks are mounting. The stock now trades above even the most optimistic analyst targets, raising questions about valuation sustainability. If AI server spending decelerates, if customers begin to build inventory, or if HDD supply ramps faster than expected, the pricing strength that has driven estimate revisions could reverse. The average analyst target of $554.13 implies a 26% downside from current levels, a gap that suggests the market is pricing in continued scarcity that may not materialize.
Next week's trading will test whether investors continue to view WDC as a scarcity play or begin to take profits. For now, buyers are betting that the HDD shortage will persist, but the stock's elevated price demands more than steady demand—it requires the supply constraint to hold. With the company's capacity fully booked through 2026, the near-term outlook remains favorable, but the risk-reward balance has shifted as the stock has outpaced fundamentals.
