Western Digital Corporation (WDC) | The Buildout — AI Infrastructure
The Verdict
Western Digital makes hard disk drives — sealed magnetic disks that store data on spinning platters. After separating from its flash business in 2025, it is a pure-play HDD company serving Cloud, Client and Consumer markets. Cloud is where AI matters: hyperscale data centers use high-capacity nearline drives as the cheap, persistent tier for the data that AI training, inference and agentic workloads generate and retain. That makes WDC an upstream supplier of bulk storage, not compute.
| Market Cap | — |
| Revenue (TTM) | $12.9B |
| Revenue Growth | +13.4% |
| EBITDA Margin (TTM) | 37.8% |
| Net Cash | $527M |
| Earnings Beats | 7 of 7 |
| P/E (TTM) | — |
| EV/EBITDA (TTM) | — |
What We Like
- Full fiscal 2026 revenue rose 36% to $12.9 billion, with gross margin up 970 bps to 49.1% and operating margin up 1,290 bps to 37.3%.
- Blended price per terabyte accelerated from high single digits to high teens y/y across two quarters; pricing, not just volume, is now driving growth.
- Management raised its long-term data-storage growth outlook to greater than 25% CAGR, from a prior 'low 20s' framing.
- The balance sheet moved to $527 million of net cash ($1,579 million cash against $1,052 million debt), and $3.1 billion was returned to shareholders in fiscal 2026.
- Cloud was 89% of revenue in fiscal Q4 and grew 43% y/y; management calls WDC a strategic partner to hyperscalers in the AI-driven data economy.
What We’re Watching
- Fiscal Q4 exabytes grew 22% y/y, down from 34% in Q3 and below the greater-than-25% long-term target. Management blames CMR/UltraSMR mix and lumpy customer buying, and expects reacceleration in the second half of FY2027.
- HAMR yield, reliability and quality still need work before volume ramp; the caveat carried forward unchanged between the two calls. The 44TB HAMR product ships in 1H CY2027.
- Pricing for the CY2029-2031 long-term agreements is still under negotiation — volume visibility is strong, but the commercial terms are not settled.
- Cost per terabyte fell about 8% y/y, below the ~10% long-term target, so margin expansion is being carried more by price than by cost.
The thesis looks to be strengthening. The company has delivered two consecutive beat-and-raise quarters, pushed gross margin through 50%, and extended its customer-commitment horizon into CY2029-2031, while the balance sheet turned to net cash. It has beaten expectations in seven of seven tracked quarters. The counterweight is execution and competition: volume growth slowed in the latest quarter, and management did not directly rebut an analyst's comparison to a main competitor that was seeing better sequential top-line growth and targeting gross margins nearly 200 bps above WDC's September-quarter guide. The key open question is how much of Cloud demand is truly AI-driven — management attributes it to AI and core cloud services alike and does not break out the split.
Earnings Beat
Fiscal Q4 2026 revenue was $3.75 billion, up 44% y/y. Gross margin was 54.1% (GAAP) and exabytes shipped were 231, up 22% y/y — the quarter's soft spot. Revenue, gross margin and EPS all landed at or above the high end of guidance, with EPS of $3.56, up 109% y/y. Cloud revenue was $3.3 billion (89% of the total, up 43%); Client was $225 million (up 61%) and Consumer $187 million (up 38%).
| Metric | Q4 FY2026 | Q3 FY2026 | Q4 FY2025 | YoY |
|---|---|---|---|---|
| Revenue | $3.7B | $3.3B | $2.6B | +43.8% |
| Gross margin | 54.1% | 50.2% | 41.0% | +1310bps |
| EBITDA | $1.7B | $1.3B | $766M | +117.0% |
| EPS | $8.50 | $8.52 | $0.71 | +1096.9% |
| Exabytes shipped | 231 | 222 (Q3 FY26) | n/a | +22% y/y |
Today, roughly 80% of data stored in a hyperscale data center resides on hard disk drives. That is likely to continue.— Irving Tan, CEO, 2026-08-05
Management tone: Management's tone was confident, and on the August call it became more structurally framed. The clearest shift was on gross margin: in April the CFO gave a non-committal answer when an analyst probed the 51-52% guide for embedded conservatism; by August he said he has 'high confidence' that gross margins keep improving for many quarters. Pricing language stepped up from 'up 9%' to 'high teens.' Management engaged directly on exabyte deceleration and confirmed the cost-per-terabyte shortfall, but reframed or declined on the competitor margin gap, sequential margin progression, and HAMR exabyte mix.
Management Guidance
For Q1 FY2027, management guided revenue of $4.1 billion ±$100 million — described as a 45% year-over-year increase at the midpoint — gross margin of 55% to 56%, diluted EPS of $4.00 ±$0.15, operating expenses of $390 million to $400 million, interest and other expense of about $15 million, a ~17% tax rate, and about 388 million diluted shares. Capital allocation is unchanged: return excess free cash flow through dividends and buybacks.
Trajectory
Revenue has grown sequentially for five straight quarters, reaching $3.75 billion in fiscal Q4 2026 from $2.61 billion a year earlier, a 44% gain. The sequential growth rate has moderated from 13.6% in Q4 FY2025 to 10.6%. Margins moved far more: GAAP gross margin rose from 41.0% to 54.1% over the period and EBITDA margin from 29.4% to 44.4%, on a mix shift toward higher-capacity drives and pricing that moved from high single digits to high teens per terabyte. Volume is the softer input, with exabytes up 22% as the mix tilted toward CMR product.
The Model
The model projects FY+1 revenue of $18,300 million and EBITDA of $8,876 million — a 48.5% EBITDA margin — and FY+2 revenue of $23,300 million and EBITDA of $12,116 million, a 52.0% margin. The near term anchors on the Q1 FY2027 guide and the Cloud nearline franchise; FY+2 turns on the ramp of 40TB ePMR, 44TB HAMR and 50TB products against the greater-than-25% long-term exabyte growth target. Across the five runs, FY+2 revenue dispersion is 12% (minimum $22,600 million, median $23,300 million, maximum $25,500 million).
| Metric | FY2026 | Next FY (E) | Following FY (E) |
|---|---|---|---|
| Revenue | $12.9B | $18.3B | $23.3B |
| YoY Growth | — | +41.7% | +27.3% |
| EBITDA | $4.9B | $8.9B | $12.1B |
| EBITDA Margin | 37.8% | 48.5% | 52.0% |
Projections are the median of 5 independent model runs. The model’s revenue sits 1.4% below analyst consensus.
For Q1 FY2027, management guided revenue of $4.1 billion ±$100 million — described as a 45% year-over-year increase at the midpoint — gross margin of 55% to 56%, diluted EPS of $4.00 ±$0.15, operating expenses of $390 million to $400 million, interest and other expense of about $15 million, a ~17% tax rate, and about 388 million diluted shares. Capital allocation is unchanged: return excess free cash flow through dividends and buybacks.
What Could Go Right — and Wrong
- Exabyte growth reaccelerates above 25% as 40TB ePMR reaches 50% of nearline bits by Q3 FY27 and UltraSMR reaches ~60% of nearline exabytes exiting FY27.
- 44TB HAMR ships on schedule in 1H CY2027 and clears its yield, reliability and quality caveat, opening the 50TB node in 2H CY2027.
- CY2029-2031 long-term agreements are signed with pricing that preserves the current margin structure, converting management's stated confidence into contracted economics.
- The AI-linked buyer set — neoclouds, frontier AI labs, sovereigns and physical AI companies — becomes a measurable share of Cloud revenue, easing concentration.
- UltraSMR's ~20% capacity uplift at little incremental cost keeps lifting bits per drive and, with firm pricing, sustains gross margin above current levels.
- Exabyte growth stays below 25% for several quarters, falling short of the greater-than-25% long-term target and the second-half FY2027 reacceleration management expects.
- Price per terabyte reverts from high teens toward flattish while cost per terabyte keeps declining only ~8% a year, stalling margin expansion.
- HAMR slips or its yield/reliability caveat persists, delaying the dense nodes the exabyte ramp depends on.
- A hyperscale customer shifts buying behavior or volume; Cloud is 89% of revenue and the top three customers were ~39% of fiscal 2025 net revenue.
- The CY2029-2031 agreements are signed at less favorable pricing than today's tight-supply environment implies, making the margin step-change look cyclical.
Looking Ahead
The next twelve months turn on execution against a set of dated commitments. Management guided fiscal Q1 2027 to $4.1 billion of revenue and 55-56% gross margin and expects exabyte growth to reaccelerate in the second half of fiscal 2027 as 40TB ePMR and 44TB HAMR ramp. HAMR ships in 1H CY2027, 50TB products are planned for 2H CY2027, and UltraSMR is targeted at ~60% of nearline exabytes exiting FY27, alongside continuing talks over CY2029-2031 supply agreements.
- Q1 FY2027 (next print)Q1 FY2027 results — Tests the 55-56% gross margin guide and whether exabytes reaccelerate.
- 1H CY202744TB HAMR ships — First shipments; tests yield, reliability and quality clearance.
- Q3 FY2740TB ePMR at 50% of bits — Tests the nearline platform-mix target.
- Exit FY27UltraSMR at ~60% of exabytes — Tests the capacity and margin lever at scale.
- 2H CY202750TB products launch — Extends the roadmap beyond 44TB HAMR.
Financials
Annual Summary
| Metric | FY2025 | FY2026 | TTM | YoY |
|---|---|---|---|---|
| Revenue | $11.4B | $12.9B | $12.9B | +13.4% |
| Gross Margin | 38.1% | 48.4% | 48.8% | +1,023bps |
| EBITDA | $3.1B | $4.9B | $4.9B | +58.4% |
| EBITDA Margin | 27.1% | 37.8% | 37.8% | +1,074bps |
| Net Income | $1.9B | $9.4B | $9.4B | +404.5% |
| Free Cash Flow | $1.3B | $3.2B | $3.2B | — |
| Net Cash | — | — | — | — |
Key Ratios (Trailing)
- P/E TTM—
- EV/EBITDA TTM—
- EV/Revenue TTM—
- Price/FCF TTM—
- Gross Margin (TTM)48.8%
- EBITDA Margin (TTM)37.8%
- Net Margin (TTM)72.9%
- ROIC42.7%
- FCF Conversion66.0%
- SBC / Revenue1.6%
The Company
Western Digital makes hard disk drives — sealed magnetic disks that store data on spinning platters. Since the February 21, 2025 separation of its HDD and Flash units, it is a pure-play HDD company; the Flash business became the public company Sandisk. It serves three markets: Cloud (high-capacity enterprise drives and storage platforms), Client (OEM and channel desktop and notebook drives) and Consumer (external storage drives sold through retail and channel). Cloud is 89% of revenue and the whole point of AI relevance — hyperscale data centers use nearline HDDs as the cheap, persistent tier for retained data.
The company owns and leases manufacturing and R&D sites across the U.S., China, Japan, Malaysia, the Philippines and Thailand, totaling over 11 million square feet, with its largest sites in San Jose, California and across Thailand, Malaysia and Japan. It does not plan to add drive-unit capacity; it raises capacity by improving areal density — more terabytes per disk — through denser products like 40TB ePMR and 44TB HAMR and the UltraSMR recording technique. Capex is light as a result: $108 million in fiscal Q4 2026.
Business Segments
Competitive Landscape
Hard-drive manufacturing is a three-player industry. The 10-K names the competitors: 'Our competitors include HDD competitors such as Seagate Technology Holdings plc, and Toshiba Electronic Devices & Storage Corporation.' A third-party wiring graph adds Pure Storage, framing the contest as HDD versus flash. Barriers are process and capital — areal-density roadmaps, HAMR head and media fabrication, and multi-year qualification cycles — which underpin WDC's pricing leverage. The counterweight is customer power: a handful of hyperscalers buy from all three makers, and management's stated pricing philosophy is 'predictable pricing.'
- Seagate Technology Holdings plcNamed in the 10-K as an HDD competitor; the source material does not provide Seagate exabyte or HAMR figures.
- Toshiba Electronic Devices & Storage CorporationNamed in the 10-K as an HDD competitor; not otherwise discussed in the source material.
- Pure Storage (PSTG)Listed in the third-party supply-chain wiring graph as a competitor in bulk storage (HDD versus flash); a spider-source mapping, not company-documented.
Supply Chain
WDC sits upstream in the storage chain: it buys heads, media, controllers and DRAM from a limited supplier base and sells finished nearline drives to hyperscale data centers. No neighbor transcript names WDC directly.
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