Direct:
The 100TB hard drive in the headlines is a 2029 target on Western Digital's (WDC) own roadmap, and some coverage puts volume closer to 2030. The constraint that matters right now is supply. WD's 2026 HDD output is sold out, driven by AI data-center demand, with some buyers already booking capacity into 2028. That allocation crunch shapes the market more than any future capacity slide.
The roadmap is still the strategic backdrop. WD laid out a plan in February 2026 to extend ePMR to 60TB using HAMR-derived techniques it says hold power consumption flat, then move to full HAMR to reach 100TB by 2029. Flat power is the part data center buyers care about. Capacity per watt and per rack slot are two of the metrics that drive hyperscale storage TCO, and a drive that grows capacity without growing power draw helps on both.
Seagate (STX) is further along on the HAMR transition. Its Mozaic 4+ platform is shipping 44TB HAMR drives in volume, with the platform qualified at two hyperscale cloud providers, while WD has leaned on ePMR and UltraSMR to keep shipped capacity competitive. Seagate committed to the HAMR transition earlier, while WD chose to extend its current recording methods before switching over.
The demand side is what gives this weight. AI training and inference produce enormous volumes of data that has to land somewhere cheaper than flash, and nearline HDD is that tier. Analysts expect over 90% of HDD units shipped to be nearline by 2030. The drives keep getting bigger, denser, and more efficient because that is precisely what the buyers are asking for.
For anyone shopping retail drives, this is the squeeze. HDD prices have posted their sharpest rise in two years, retail SKUs likely sit behind hyperscale orders in the queue, and the same AI-driven allocation pressure already running through DRAM and NAND has reached spinning disk.
Drafted with AI assistance against parallel reporting.
Sources:
- DigiTimes, “WD pushes toward 100TB hard drives as AI storage demand surges” (June 10, 2026)
- Western Digital newsroom, “Accelerates Storage Innovation for AI Era,” ePMR to 60TB and HAMR to 100TB by 2029 (February 3, 2026)
- Yahoo Finance / earnings coverage, WD sold out 2026 HDD production, bookings into 2028 (2026)
- Seagate investor relations, Mozaic 4+ 44TB HAMR shipping in volume, platform qualified at two hyperscalers (2026)
- Forbes (Tom Coughlin), nearline to exceed 90% of HDD shipments by 2030 (December 2025)
- DigiTimes, “WD says 2026 capacity sold out as HDD prices post sharpest rise in two years” (February 13, 2026)
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