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Western Digital is the more direct way to invest in hard-disk drives (HDDs); Sandisk is the flash-memory and NAND play. Both reported strong fiscal 2026 results as demand for data storage grew, but Sandisk’s much faster revenue growth coincided with a sharp pricing increase, not just higher volumes. Neither is demonstrably the better stock without comparing its current valuation with normalized earnings, cash flows and risks.
Are Western Digital and Sandisk still the same company?
No. Western Digital completed the separation of its flash business on February 21, 2025. Sandisk began trading independently on Nasdaq under SNDK on February 24, 2025. WD continued as the HDD-focused company, and it had disposed of its Sandisk stake by July 3, 2026. Investors are comparing two independent businesses, not a parent with a subsidiary or two brands under one company.
What part of AI-related storage does each company sell?
Western Digital: HDD capacity
WD’s FY2026 filing describes an HDD business serving Cloud, Client and Consumer markets. Cloud is its largest and fastest-growing end market. Its drives serve cloud data centers and enterprise systems as well as edge computing, smart video, client devices and consumer uses. High-capacity HDDs are relevant to data-center storage needs, but AI investment does not automatically translate into orders for WD: demand depends on how infrastructure is built and what customers buy.
Sandisk: flash and NAND
Sandisk is the flash/NAND business separated from WD. Its FY2026 results group sales into Datacenter, Edge and Consumer markets. The company says AI infrastructure is driving demand for high-performance and NAND storage products. Flash and HDDs are distinct technologies with different roles; they should not be treated as interchangeable products in every workload or as a simple winner-takes-all contest.
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How did the companies perform in fiscal 2026?
The figures below are company-reported results for fiscal years ended July 3, 2026—not independent forecasts. WD reported its results in 2026; Sandisk also reported its FY2026 results in 2026.
| Measure | Western Digital | Sandisk |
|---|---|---|
| FY2026 revenue | $12.919 billion, up 36% year over year (WD, 2026) | $20.248 billion, up 175% year over year (Sandisk, 2026) |
| FY2026 GAAP operating income | $4.453 billion (WD, 2026) | $12.389 billion (Sandisk, 2026) |
| Other reported operating-income measure | Not stated in the cited WD FY2026 figures | $12.700 billion non-GAAP operating income (Sandisk, 2026) |
| FY2026 Q4 revenue | $3.747 billion, up 44% year over year (WD, 2026) | $8.965 billion, up 51% sequentially (Sandisk, 2026) |
| FY2026 Q4 gross margin | 54.1% GAAP gross margin (WD, 2026) | Not stated in the cited Sandisk FY2026 figures |
Those headline rates do not make the companies directly comparable on profitability or valuation. Sandisk reports both GAAP and non-GAAP income; the measures use different definitions, so investors should review the company’s reconciliation and unusual items rather than compare an adjusted figure with a GAAP figure.
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How much of Sandisk’s growth came from pricing?
Sandisk’s FY2026 Q4 revenue rose 51% sequentially. Management attributed approximately one-third of that increase to higher volumes and two-thirds to higher pricing. Its Datacenter revenue was $2.977 billion, up 103% sequentially. Consumer revenue, by contrast, fell sequentially in the quarter. This mix matters: rapid reported growth can reflect favorable price and product mix as well as unit demand, and those factors may not persist at the same rate.
WD reported 36% FY2026 revenue growth and 44% year-over-year Q4 growth. Its results do not by themselves show how much future growth will come from unit shipments, capacity mix or pricing. For either company, track those components over time rather than projecting one strong year forward unchanged.
What could make either company benefit from AI demand?
WD says long-term growth in cloud data storage and AI- and hybrid-data workloads are benefiting its HDD business. It also reports that higher-capacity drives are more complex to manufacture and have longer production lead times, while customers are partnering earlier and extending commercial arrangements. These are management’s descriptions of its market and operations, not independent proof that AI spending will convert into a particular level of HDD sales.
Sandisk says rapid AI-infrastructure growth drove demand for high-performance storage and NAND, while favorable pricing trends supported revenue and cash flow. Its New Business Model agreements with Datacenter and Edge customers generally set volumes for delivery and purchase over mostly multi-year periods, with fixed and variable pricing components. The company cautions that these agreements do not eliminate demand, market or execution risks.
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Which is the better AI storage stock?
The evidence supports a distinction in exposure, not a stock-picking verdict. WD is the more direct HDD thesis; Sandisk offers NAND/flash exposure and posted the faster FY2026 growth. To decide whether either is attractive at its current share price, compare what the market already expects with earnings and cash flows that could hold up across a storage cycle.
- Choose the operating exposure first. Consider whether your thesis is centered on high-capacity HDDs, NAND/flash, or a mix of storage technologies. AI is a demand driver to investigate, not a substitute for understanding the business.
- Separate units, pricing and mix. Sandisk’s Q4 explanation shows why revenue growth alone can mislead. For WD, examine reported shipments, capacity mix and pricing disclosures rather than assuming that all cloud growth benefits every product equally.
- Test delivery and execution. WD flags manufacturing complexity and longer lead times for higher-capacity drives. Sandisk identifies supply-chain, product-ramp and partner risks. Demand matters only if a company can supply products profitably and on time.
- Compare financials on a consistent basis. Review GAAP results, non-GAAP reconciliations, cash generation, debt, share count and capital returns. A high operating-income figure is not by itself a measure of cash available to shareholders.
- Use a valuation and cycle range. Compare current share prices and market capitalization with normalized, mid-cycle earnings and cash flows, then test less favorable pricing and demand scenarios. FY2026 growth rates alone cannot establish which stock is cheaper or likely to outperform.
What risks could upset the AI storage case?
Both companies warn that demand can vary, competition can pressure pricing, and manufacturing or supply interruptions can delay deliveries. Trade policy can also raise costs or change demand. WD additionally identifies supplier dependence, customer relationships, debt and execution on new technologies as risks. Sandisk cites key partners including Kioxia, customer concentration or relationship changes, product defects, product ramps, technology transitions, tariffs and the difficulty of forecasting cyclical demand.
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These risks make it especially hazardous to treat Sandisk’s 175% FY2026 revenue growth as a durable run rate: the company reported that higher pricing contributed most of its Q4 sequential increase. WD’s lower reported growth does not make it automatically safer or cheaper; its own capacity, supply, customer and balance-sheet exposures still matter.
What should investors check before buying?
WD paid $0.50 per share in FY2026 and declared a $0.15 dividend after year-end, according to its FY2026 results. Sandisk said it did not currently intend to pay cash dividends and announced an additional share-repurchase authorization in August 2026. These are company-reported capital-allocation choices, not permanent commitments; check later filings and announcements for changes.
Before acting, check each company’s latest filings and results for updated demand, pricing, customer commitments, debt, cash flow and capital returns. Then compare those operating facts with dated market data and your own assumptions about the storage cycle. Without current valuation and normalized earnings estimates, reported growth cannot answer which security is the better purchase.
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