The HDD price increase cycle remains in its early stages, and HAMR advantages make STX the sector top pick

Overview

The report combines STX management NDR with recent NAND and HDD company results to assess demand, supply, pricing, and technology cycles in the storage industry. The core view is that the HDD price increase cycle remains in its early stages: cloud computing, enterprise storage, AI training, and inference are jointly driving incremental capacity demand, while vendors' decision not to expand unit capacity keeps supply restrained. STX, with its leading position in HAMR, has the potential for faster capacity growth, deeper cost declines, and greater share gains; SNDK benefits from NAND strength and earnings stability brought by long-term agreements.

Core views

First, STX establishes expected quantities through multi-year long-term agreements, which then convert into firm purchase orders 4 to 5 quarters before shipment, providing strong visibility into pricing and capacity over the next several quarters. Second, STX, WDC, and Toshiba have not significantly increased HDD unit capacity, and industry supply discipline is supportive of continued average selling price increases. Third, HAMR is key to increasing per-drive capacity and reducing cost per unit of capacity in the future, and STX's first-mover advantage gives it a better path than WDC in terms of capacity shipments, costs, and margins. Fourth, the context, outputs, metadata, and content generated by AI inference will continue to flow into low-cost HDDs, while longer data retention periods further strengthen long-term demand. Fifth, although SNDK's increased long-term agreement coverage may limit near-term pricing elasticity, it can provide downside protection, reduce cyclicality, and support a valuation re-rating.

Analysis framework

The report uses a combination of management interviews, order visibility analysis, industry supply-demand assessment, technology roadmap comparison, and forward P/E valuation. At the operating level, it compares STX and WDC in terms of HAMR progress, areal density improvement, capacity shipment growth, costs, and margins; at the valuation level, it uses FY28E earnings per share and cyclical earnings multiples to determine target prices.

Methodology notes

• Supply-demand analysisOrder visibility and capacity discipline analysis

  Assess future supply-demand and pricing trends through long-term agreements, purchase order lock-in periods, production lead times, and unit capacity plans.

  STX typically forms firm purchase orders 4 to 5 quarters before shipment, while the production lead time is approximately 3 quarters; major vendors have also not expanded unit capacity, so the report believes demand visibility is high and supply remains tight.

• Technology competitiveness analysisHAMR technology roadmap comparison

  Compare different vendors' ability to achieve capacity growth, cost reduction, and share expansion through areal density improvements.

  STX has actively scaled HAMR products, while WDC's HAMR transition is relatively behind. Based on this, the report judges that STX can achieve faster capacity shipment growth, larger cost reductions, and higher margins.

• Thematic demand analysisTransmission from AI data generation to storage demand

  Derive AI's long-term demand for HDDs and SSDs from computing activity, data generation, retention periods, and hot/cold tiered storage.

  SSDs mainly serve high-performance, caching, and warm storage scenarios, but larger-scale cold data ultimately still needs to enter low-cost HDDs; the adoption of AI inference and longer data retention periods will increase demand for incremental storage capacity.

• Relative valuationForward P/E valuation

  Apply target P/E multiples based on FY28E earnings per share and cyclical earnings levels.

  STX and WDC are both valued at 21x FY28E earnings per share; SNDK is valued at 11x FY28E earnings per share, or 14x average FY26 to FY30 earnings per share.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• STX

  Preferred name in the HDD upcycle

  Strengths

  HAMR leadership, high order visibility, faster areal density improvement, and the potential to achieve stronger capacity growth, cost reductions, and share gains.

  Weaknesses

  Capacity is close to full utilization, and HAMR production requires more equipment, space, and longer cycles, resulting in higher execution complexity.

  Comparison

  Compared with WDC, STX is more advanced in HAMR, and is expected to deliver better capacity shipment growth, cost improvements, and margins.

  Risks

  Cloud capital expenditure digestion, changes in hyperscaler purchasing methods, WDC accelerating its HAMR catch-up, and NAND technology advances.

• WDC

  Benefits from HDD price increases but is not the sector top pick

  Strengths

  Industry price improvements have driven results above expectations and guidance upgrades, and it can still share in the cyclical benefits brought by supply discipline.

  Weaknesses

  Its HAMR transition lags STX, limiting areal density improvement, capacity shipment growth, and cost reduction.

  Comparison

  The industry upturn benefits both STX and WDC, but STX's technology leadership makes its risk-reward more attractive.

  Risks

  HAMR transition weighing on gross margin and earnings per share, slowing cloud demand, and NAND substitution risk.

• SNDK

  Beneficiary of NAND strength and contract stability

  Strengths

  Strong FQ4’26 performance, with about two-thirds of sales volume covered by long-term agreements, helping provide downside protection, improve earnings durability, and reduce market concerns about cyclicality.

  Weaknesses

  Higher long-term agreement coverage may limit near-term pricing elasticity, and the company's disclosures and investor communications are viewed as relatively complex.

  Comparison

  Compared with pure HDD names, SNDK has more direct exposure to the NAND cycle, but higher contract coverage can improve earnings stability.

  Risks

  Downturn in the NAND pricing cycle, structurally weak industry conditions, asset value below replacement cost, and investor communications affecting valuation.

• HDD

  Low-cost, high-capacity storage carrier for AI and cloud data growth

  Strengths

  Clear cost advantage in cold storage, dominance of incremental capacity demand, longer data retention periods, and constrained industry supply.

  Weaknesses

  Demand is concentrated among hyperscale cloud customers, unit capacity expansion is limited, and advanced manufacturing conversion is complex.

  Comparison

  Compared with NAND and SSDs, HDDs have lower performance, but have a significant cost advantage in large-scale cold data storage.

  Risks

  Slowing cloud capital expenditures, changes in customer purchasing behavior, and substitution pressure from NAND technology cost improvements.

Key data

• STX June quarter price increaseapproximately 6% QoQMainly reflects price negotiations completed about four quarters earlier, helped by a small amount of market-based incremental shipments.
• Purchase order lock-in periodapproximately 4 to 5 quarters before shipmentOrders usually specify quantities, average selling prices, delivery timing, HDD counts, and per-drive capacity.
• Production lead timeapproximately 3 quartersThis enables STX to obtain relatively clear order information before committing production resources.
• STX nearline capacity growth targetapproximately 25% annual growthMainly relies on HAMR to increase per-drive capacity rather than increasing HDD unit capacity.
• HAMR share of STX nearline productsapproximately 40%Management expects HAMR to ultimately become the main technology in the nearline product mix.
• Recent HDD pricing trendmid-to-high single-digit QoQ growthThe report believes the pricing inflection point appeared only about two quarters ago, and the price increase cycle still has substantial room to run.
• SNDK long-term agreement coverageapproximately two-thirds of sales volumeHigher coverage may slow near-term average selling price growth but helps reduce earnings volatility.
• SNDK target price and closing price$3,000/$1,258.58Closing price as of August 6, 2026, corresponding to approximately 138.4% potential upside.
• STX valuation21x FY28 EPS of $64.40Corresponds to a target price of $1,350.
• WDC valuation21x FY28E earnings per shareCorresponds to a target price of $770.
• SNDK valuation11x FY28E earnings per shareAlso equivalent to 14x average FY26 to FY30 earnings per share, corresponding to a target price of $3,000.

Impact & implications

At the industry level, limited unit capacity, long order lock-in periods, and continuously increasing data volumes jointly support improvements in HDD average selling prices and profitability. At the company level, STX is most likely to use HAMR to expand its capacity share and achieve superior costs and margins; WDC still benefits from industry price increases but has a slower technology transition; SNDK trades higher long-term agreement coverage for more stable NAND earnings and potential valuation re-rating. Investors should view technology execution progress, cloud customer capital expenditures, and contract coverage as key variables determining the duration of the cycle and relative stock performance.

Risks

• Hyperscale cloud customer capital expenditures enter a digestion period, or purchasing models change unfavorably.
• WDC's HAMR progress is faster than expected, weakening STX's room for share and margin improvement.
• NAND technology and cost improvements exceed expectations, taking more storage share from HDDs.
• The increase in equipment, space, and production cycles required for the HAMR manufacturing transition may create yield, cost, or delivery risks.
• SNDK's recent earnings are at a high level, and a reversal in the NAND pricing cycle could lead to earnings downgrades.
• SNDK's disclosures and investor communications are complex, which may suppress participation by high-quality long-term investors and valuation re-rating.

What to watch

• STX's HDD average selling price QoQ increases over the next several quarters and the pace of exit from early HAMR discounts.
• STX's nearline HAMR share, per-drive capacity, capacity shipment growth, and cost per unit of capacity changes.
• WDC's HAMR qualification, mass production timetable, and whether its technology gap with STX narrows.
• Cloud service provider capital expenditures, enterprise storage demand, and growth in AI inference data volumes.
• Whether new cloud service providers shift from simply providing compute to building complete storage infrastructure themselves.
• SNDK's long-term agreement coverage, contract pricing, and NAND average selling price trends.
• The ratio of incremental capacity to equipment refresh demand, and whether data retention periods continue to lengthen.