Key Takeaways
- Both Seagate Technology stock and Western Digital stock have roughly doubled on the same nearline hard drive demand surge, but TIKR’s valuation model shows the two stocks pricing in very different amounts of the remaining upside.
- TIKR’s model targets around $2,639 for Seagate Technology stock at roughly 25% per year versus around $1,251 for Western Digital stock at roughly 14% per year, an IRR gap that makes STX the clearer data-backed choice.
- Seagate’s nearline capacity is almost fully allocated through calendar 2027 with build-to-order contracts finalized for fiscal 2027, giving STX unusual earnings visibility for a cyclical hardware company.
- Western Digital stock carries a net cash balance sheet after monetizing its SanDisk stake, and consensus FCF margins reach 33% by mid-2027, making WDC the stronger near-term capital return story.
Seagate Technology and Western Digital Sell the Same Drive Into the Same Boom, but Their Technology Timelines Are Not the Same
Seagate Technology (STX) makes hard disk drives, the high-capacity spinning disks that sit inside data center storage racks and hold most of the world’s accumulated data.
A small number of companies make nearline hard drives, the type used at massive scale inside cloud infrastructure, and demand from hyperscalers has been growing fast enough that both supply and pricing are tight.
Seagate is the pure expression of that thesis, with every dollar of revenue coming from hard drives and the company’s entire technology bet resting on HAMR, a recording technology called Heat-Assisted Magnetic Recording that packs dramatically more data onto each disk.
CEO Dave Mosley told analysts in Q3 earnings call that two of the world’s largest cloud providers have now fully qualified Seagate’s Mozaic 4 platform, which delivers up to 44 terabytes per drive.
Nearline products accounted for close to 90% of Seagate’s total exabyte shipments in the March quarter, and CFO Gianluca Romano confirmed that nearline capacity is almost fully allocated through calendar 2027 with build-to-order contracts finalized for the full fiscal 2027.
Meanwhile, Western Digital Corporation (WDC) arrived at the same business from a different direction, spending years as a diversified storage player before spinning off its NAND flash business, SanDisk (SNDK), and becoming a focused hard drive company.
That transformation is recent enough that the financial history carries noise from a prior structure, but the forward business is straightforward: Western Digital makes nearline hard drives for cloud and enterprise customers and is now the only pure-play competitor to Seagate in the high-capacity segment.
CEO Irving Tan told analysts in Q3 earnings call that cloud represented 89% of total revenue and that Western Digital’s long-term agreements now extend into calendar 2029.
The company’s technology path differs slightly, ramping a next-generation ePMR (energy-assisted perpendicular magnetic recording) drive to 40 terabytes before its HAMR platform reaches volume, with HAMR currently in qualification with four customers.
The distinction that matters for valuation is timing: Seagate’s HAMR platform is already generating revenue and contributing to margins, while Western Digital’s HAMR is still in qualification with volume ramp expected in 2027.
Both stocks have priced in the demand story, but what they have not priced in equally is the technology execution risk between here and full HAMR scale.
Analysts See the Same Demand at Seagate Technology and Western Digital but Are Not Paying the Same Price for It
Seagate has a shorter path between current production and peak-cycle margins because HAMR is already shipping at scale, while Western Digital is building toward that same margin profile with a product transition still in progress.
Seagate Technology stock carries consensus revenue estimates of $3.48B for the June quarter (42% YoY growth), stepping to $4.54B by the June 2027 quarter (30% YoY growth).
Normalized EPS reaches $8.00 by that same period, up from $4.10 in the most recent actual quarter, with FCF margins holding around 28%.
The HAMR revenue ramp, combined with a build-to-order model that locks in pricing before production starts, is the operational anchor for those EPS estimates.
On the other hand, Western Digital stock carries consensus revenue estimates of $3.69B for the June quarter (42% YoY growth), stepping to $4.91B by the June 2027 quarter (33% YoY growth).
Normalized EPS reaches $5.28 by that same period, with FCF margins expanding to around 33%.
The higher FCF margin reflects Western Digital’s leaner capital structure after the SanDisk monetization and aggressive share repurchases.
The Street sees more absolute dollar upside remaining in Seagate Technology stock on a model-adjusted basis, while Western Digital stock has re-rated more sharply relative to where it traded a year ago, compressing the forward implied upside relative to what the model suggests the business is worth.
Seagate Technology and Western Digital Are Both Recovering Fast, but Western Digital Carries the Higher Gross Margin Floor
Seagate Technology started from a lower gross margin base and has been closing the gap through a combination of HAMR product mix, pricing discipline, and operating leverage, with gross margin expanding from 32% in the June 2024 quarter to 47% in the most recent March 2026 quarter, and operating margin moving from 15% to 36% over the same eight-quarter stretch.
Western Digital’s gross margin moved from 35% in June 2024 to 50% in the March 2026 quarter, and operating margin expanded from 12% to 37%, meaning both companies arrived at nearly identical operating margin levels but Western Digital got there with a higher gross margin base.
That gross margin gap is the most important structural distinction in these two income statements: Western Digital at 50% converts every dollar of incremental revenue to profit at a higher rate before operating expenses, while Seagate at 47% is closing that gap as HAMR mix increases, because higher-capacity HAMR drives carry better unit economics than the PMR drives they replace.
CFO Romano noted that the move to 40-terabyte HAMR, and then to the Mozaic 5 platform targeting 50 terabytes, is the primary driver of ongoing cost reduction independent of adding manufacturing units, and if HAMR mix continues to accelerate at the rate Seagate has guided, the gross margin gap between the two companies narrows further over the next four to six quarters.
Seagate carries R&D spend at around $190M per quarter against a $3.1B revenue base, a reflection of a company fully committed to a single technology platform.
Western Digital, by contrast, carries roughly $290M in R&D against a $3.3B revenue base, the cost of running ePMR and HAMR development simultaneously rather than committing fully to one track.
Seagate generated $1.11B in operating cash flow in the March 2026 quarter after $161M in capex, producing free cash flow of approximately $950M, while Western Digital generated $1.12B in operating cash flow after $145M in capex, producing free cash flow of approximately $978M.
At the operating cash generation level, these two businesses are nearly identical in the current quarter.
TIKR’s Model Shows Seagate Technology Offering Nearly Double the Annualized Return of Western Digital at Current Prices
TIKR’s model values Seagate Technology at approximately $2,639 by June 2030, implying around 147% total return from the current price of approximately $1,070, or roughly 25% per year.
The build-to-order contracts already finalized for fiscal 2027 lock in the revenue trajectory the model depends on.
HAMR mix expanding toward 70% of nearline exabytes by fiscal year-end is what gets net income margins into the low-40% range, and CFO Romano confirmed operating margin in the lower-40% range for the June quarter alone.
Seagate produced free cash flow of approximately $950 million in a single quarter, and if the business compounds FCF at that rate while capex stays inside 4% to 6% of revenue, the equity value accretes toward the model’s target on the math alone.
The SanDisk spin removed the structural overhang that had suppressed the multiple for years, and Western Digital now generates clean, growing free cash flow from a single-segment hard drive business.
CFO Sennesael confirmed a 29% FCF margin in the March quarter, approaching the company’s stated 30%-plus target, and consensus sees that expanding to 33% by mid-2027 as ePMR volumes ramp.
The target holds if HAMR yields reach production-level reliability before demand cycles down, which the pace of qualifications with four customers currently suggests is on track.
Should You Invest in Seagate Technology Holdings plc or Western Digital Corporation?
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Pull up Seagate Technology Holdings plc stock and Western Digital Corporation stock and you’ll see years of historical financials, what Wall Street analysts expect for revenue and earnings in the quarters ahead, how valuation multiples have moved over time, and whether price targets are trending up or down for both companies.
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