Who makes HDD for AI data centers
HDD (nearline / object tiers)
Spinning hard disk drives used for the bulk, lower-cost nearline and object storage tier that holds data too large or too cold to justify keeping on flash.
HDD sits below NAND and enterprise SSDs (2.07, 2.08) in the storage hierarchy, typically inside the AI storage systems described next (2.10) as the capacity tier for raw and processed datasets, backups, and object stores rather than the latency-critical path a GPU reads from directly. The volume of training data, checkpoints, and generated content that needs affordable long-term retention keeps growing even as flash takes over the performance-sensitive tiers, which sustains nearline HDD demand alongside SSD growth rather than being displaced by it. For an investor, this is a consolidated supplier base of a small number of large-scale drive makers where areal-density roadmaps and qualification with the largest buyers gate competitive position, and the category competes for the same underlying manufacturing investment dollars against flash's continued growth.
AI delta: The sheer volume of training data, checkpoints, and generated content needing affordable long-term retention keeps nearline HDD demand growing alongside, not despite, flash's rise in performance-sensitive tiers.
Companies on this part (3)
| Company | Role | Ownership | Ticker | Price | 1d | Confidence | Note |
|---|---|---|---|---|---|---|---|
| Seagate | manufacturer | public | STX | 630 USD | +2.7% | inferred | |
| Western Digital | manufacturer | public | WDC | 344 USD | +3.8% | disclosed | · source |
| Toshiba | manufacturer | private | disclosed | · source |
Who competes here
The same table read the other way: every company above competes for HDD sockets. Confidence tags matter — an inferred placement is a lead, not a confirmed rivalry.
Seen in real machines
HDD is named in 1 of the rack teardowns and supercomputer breakdowns on this site. Each line below is a piece of that machine. The companies shown are the ones named on that line, not necessarily the maker of this part.
- Frontier · supercomputer
- Orion drives (Seagate Exos X18 18 TB HDDs, Samsung PM1733 NVMe performance tier, KIOXIA 30 TB NVMe metadata tier) — Seagate, Samsung Electronics, Kioxia
Nearby parts
- Previous in layer: Enterprise SSDs & controllers
- Next in layer: AI storage systems
- Layer: Layer 2 — Memory & storage
From the blog
- Part of the day: HDD 2026-09-02
Latest feed
- Western Digital bets on pricing and HAMR, not new capacity, as Toshiba plans to double output — DigiTimes, 2026-10-23Western Digital plans to increase pricing and density of its HDDs rather than building new capacity, relying on HAMR adoption while Toshiba aims to double its output.
- Western Digital argues AI's longer payoff lies in stored data, not compute — DigiTimes, 2026-10-23Western Digital stated that the demand for hard drives is sustained by multiple sources, including cloud services, model training, inference, and physical AI, rather than being solely reliant on the current AI compute spending.
- Western Digital widens margins on pricing and exabyte growth — DigiTimes, 2026-10-23Western Digital reported a significant increase in its hard-drive business gross margin for the first quarter due to pricing and increased demand.
- Everspin Expands MRAM Push into AI Servers, Data Centers, Satellite Systems — EE Times, 2026-10-22Everspin's CEO discussed the potential use of MRAM technology in AI servers and data centers, especially in the context of NOR flash supply shortages.
- SK hynix to place custom tiny CPU cores in its SSD controllers to ease Arm load as drive speeds rocket — Tom's Hardware, 2026-10-14SK hynix is introducing custom 'H-TPU' tiny processor cores into its enterprise SSD controllers to offload routine I/O tasks from Arm-based CPUs to improve performance.
- Samsung expands memory testing beyond Korea with US$4.08 billion Vietnam project — DigiTimes, 2026-10-08Samsung is investing $4.08 billion to expand its memory chip manufacturing and testing capabilities in Vietnam.
- Seagate and Toshiba battle for TDK's HDD head business, a critical hard drive component — Tom's Hardware, 2026-10-07Seagate and Toshiba are competing to acquire the hard drive head business from TDK, a critical component for high-capacity storage.
- Seagate, Toshiba reportedly compete for TDK's HDD head unit, a key AI storage link — DigiTimes, 2026-10-07Seagate and Toshiba are reportedly competing to secure a supply of HDD head units from TDK, which are essential components for high-capacity AI storage.
- Toshiba to double HDD production capacity amid devastating shortages — Tom's Hardware, 2026-10-02Toshiba is planning to double its hard disk drive production capacity to address significant supply shortages.
- Toshiba reportedly to double HDD production as AI drives storage demand — DigiTimes, 2026-10-02Toshiba is reportedly doubling its hard disk drive production to meet the surging storage demands driven by artificial intelligence.
Questions about HDD
- What is HDD?
- Spinning hard disk drives used for the bulk, lower-cost nearline and object storage tier that holds data too large or too cold to justify keeping on flash.
- Which companies make HDD for AI data centers?
- This catalog lists 3 companies on HDD, 2 of them with listed equity: Seagate, Western Digital, Toshiba.
- How does AI change demand for HDD?
- The sheer volume of training data, checkpoints, and generated content needing affordable long-term retention keeps nearline HDD demand growing alongside, not despite, flash's rise in performance-sensitive tiers.
- How reliable are these HDD supplier placements?
- The 3 placements on this part break down as 2 disclosed, 1 inferred. "disclosed" means the company or a filing says so; "reported" comes from trade press or a reference-design list; "inferred" is a taxonomy lead with no citation yet.
Sources: placements without a source URL come from the taxonomy seed and are tagged accordingly. How this data is built.· Markdown · JSON