Western Digital Qualifies 40TB ePMR HDD, Eyes 100TB HAMR by 2029

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Western Digital qualified its 40TB ePMR HDD for H2 2026 volume production and plans HAMR HDD ramp in 2027, scaling ePMR to 60TB and HAMR to 100TB by 2029. It introduced High Bandwidth Drive Technology for 2x bandwidth and Dual Pivot actuators to deliver up to 4x IO by 2028.

1. Strategic Transformation Fuels Innovation Day 2026

At its Innovation Day 2026 in San Jose and New York, Western Digital outlined a new customer-centric storage roadmap engineered for the AI era. Over the past year the company shifted to multi-year customer commitments, more than doubled gross profit year-over-year through disciplined execution, refreshed leadership to accelerate decision-making and secured inclusion in the Nasdaq 100. These strategic moves underpin the rollout of scalable capacity, performance optimizations, power efficiency enhancements and an intelligent platform API designed to reduce total cost of ownership for hyperscalers and enterprise customers alike.

2. Dual-Path Capacity Expansion to 100TB+

Western Digital reaffirmed its leadership in both energy-assisted perpendicular magnetic recording (ePMR) and heat-assisted magnetic recording (HAMR). The company’s 40TB UltraSMR ePMR drives are in qualification with two hyperscale customers and volume production is slated for H2 2026. Concurrently, HAMR drives are in qualification ahead of a 2027 ramp. Leveraging a common architecture, WD will scale ePMR to 60TB and HAMR to 100TB by 2029 without increasing power draw, giving customers predictable capacity growth and seamless technology transitions on their own timelines.

3. Industry-First Performance Innovations Close Flash Gap

To address AI workload demands previously reserved for flash, WD introduced High Bandwidth Drive Technology—delivering up to 2× the bandwidth of conventional HDDs with no power penalty and a roadmap to 8× gains—and Dual Pivot Technology, which adds a second set of independent actuators to double sequential I/O within a 3.5-inch form factor. Combined, these features can quadruple sequential I/O and support 100TB drives at today’s I/O-per-terabyte ratios, reducing reliance on higher-cost SSD tiers. High Bandwidth is already in customer validation, with Dual Pivot drives entering labs for a 2028 release.

4. Power-Optimized HDDs and Platform Expansion

Recognizing the need for a sub-second access tier for cold AI data, WD showcased power-optimized HDDs that cut operating power substantially while maintaining a 3.5-inch form factor, with qualification planned for 2027. Additionally, the Platforms business will launch an open intelligent software layer in 2027 to bring hyperscale storage efficiency to customers operating at 200+ petabytes. This API-driven layer will streamline deployment across UltraSMR, ePMR, HAMR and flash, slashing qualification risk and accelerating time-to-value for AI-scale infrastructure.

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