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Western Digital Unveils 40TB UltraSMR ePMR Hard Drive and Future Capacity Roadmap

Western Digital announces a 40TB UltraSMR ePMR hard drive for hyperscale customers, outlines High Bandwidth Drive Technology, power‑optimized models, and a roadmap to 55TB‑100TB capacities by 2030.
6 February 2026 by
TechStora Editorial Board

40TB UltraSMR ePMR Drive – Current Milestone

Western Digital has entered customer qualification with a 40TB UltraSMR ePMR hard drive, targeting hyperscale data‑center deployments. Volume production is slated for the second half of 2026.

Key Technologies Behind the New Drive

The drive combines two advanced recording methods:

  • UltraSMR (Shingled Magnetic Recording) – packs more data per track by overlapping magnetic writes.
  • ePMR (Energy‑Efficient Perpendicular Magnetic Recording) – maintains high reliability while allowing tighter track spacing.

Unlike earlier dual‑actuator concepts, this architecture does not require software changes on the client side and avoids capacity trade‑offs.

High Bandwidth Drive Technology

WD’s High Bandwidth Drive Technology (HBDT) enables simultaneous reading and writing across multiple heads and tracks. The result is up to four times the sequential I/O performance of current HDDs without increasing power draw.

Future Capacity Roadmap: 55TB to 100TB

Industry players are racing toward larger platters and new magnetic media. The projected timeline is:

  • 2026 – 40TB UltraSMR ePMR (WD)
  • 2027 – Power‑optimized 40TB drives (WD) for AI training/inference workloads
  • 2028 – 60TB ePMR and further HAMR scaling (WD)
  • 2029 – 100TB HAMR‑based drives enter broader production (WD)
  • 2030 – 55TB‑69TB drives from competitors; potential 70TB+ HDDs on the horizon

Power‑Optimized Drives for AI Workloads

To address the growing power budget of data centers, WD is developing drives that trade a modest amount of random I/O performance for up to 20% lower energy consumption while keeping sub‑second access times. These drives are aimed at large, frequently accessed datasets that are too costly to store entirely on SSDs.

Industry Impact and Outlook

The 40TB launch demonstrates that magnetic storage can still scale economically for massive data‑lake environments, even as SSDs dominate latency‑critical workloads. Success will depend on maintaining reliability, cost‑effectiveness, and power efficiency as capacities push toward the 100TB mark.