Western Digital has posted a strong set of results for its fiscal 2026 fourth quarter, with total revenue surging 44% year-on-year to $3.75 billion. The company attributes this performance to the rapid growth of data generated by AI inference and physical AI systems, which it describes as a "compounding" effect. The company's full-year revenue for fiscal 2026 reached $12.9 billion, a 36% increase from the prior year, with earnings per share doubling. Guidance for the first quarter of fiscal 2027 was set at $4.1 billion, indicating a roughly 45% year-on-year increase.

During the earnings call, CEO Irving Tan highlighted a significant structural shift in the market. He argued that unlike computing cycles, which can be reused, data continues to compound and accumulate over time. This is driven by the transition of AI from answering simple questions to functioning as autonomous agents that generate data at every step of a workflow. The company sees AI as a "structural and step-function driver" for capacity storage demand, moving beyond a one-time infrastructure build to a continuous cycle of data creation and retention.

A key area of growth is "physical AI," which includes autonomous vehicles, humanoid robots, and industrial automation. Tan noted that the real-world data needed to train these systems is insufficient, forcing companies to generate and store synthetic datasets. He cited a specific example of an autonomous vehicle company whose demand for exabytes of storage has grown several times over the current calendar year. This, combined with the rise of sovereign clouds and new data centers, is creating powerful new demand engines for Western Digital's hard drives.

Long-term visibility and pricing power

Western Digital's cloud business now accounts for 89% of its total revenue. The company's visibility into future demand is extremely high, as it is actively negotiating long-term agreements (LTAs) with customers that extend through the 2029, 2030, and 2031 calendar years. The company reported that customer demand for extending these LTAs remains very strong, locking in exabyte-level demand growth, which the company expects to be above 25%. This tight supply environment gives Western Digital increased pricing leverage, as it provides customers with predictable pricing for long-term architecture decisions.

Despite the surge in demand, Western Digital is maintaining a disciplined approach to capital expenditure, focusing on productivity improvements rather than large-scale capacity expansion. The company's profitability is expected to expand through technological innovation. Its product roadmap includes the 40TB EPMR drive, which began shipping in the June quarter and is expected to account for 50% of nearline shipments by the third quarter of fiscal 2027. A 44TB HAMR drive is on track for the first half of the 2027 calendar year, followed by a 50TB product in the second half of the same year. This transition to higher-capacity drives is expected to reduce per-terabyte costs by approximately 10% year-over-year in the medium to long term, ensuring sustained profitability.

Financial performance and outlook

For the fiscal 2026 fourth quarter, Western Digital's gross margin expanded significantly to 54.4%, driven by a favorable shift to higher-capacity drives and firm pricing. The company generated free cash flow of $1.3 billion in the quarter, resulting in a robust free cash flow margin of 34%. The company is actively returning capital to shareholders, having repurchased shares and paid dividends. Guidance for the first quarter of fiscal 2027 points to continued strong performance, with revenue expected to be around $4.1 billion and gross margins between 55% and 56%.

In response to analyst questions, management confirmed that the company's strong pricing environment is supported by the value it provides to customers through better total cost of ownership (TCO). The company sees pricing power continuing in a predictable manner, especially as it rolls out higher-capacity drives. The company's technology leadership, deep customer relationships, and operational discipline are positioning it to capture the long-term tailwinds from the data revolution, which it believes is far from over.