HDD supply shortage of 15% projected as AI demand scales

The widening gap between storage production and AI-driven demand creates a high-margin environment for dominant hardware providers. For streaming infrastructure, this shortage implies rising costs for long-term data retention, including inference logs and model versioning essential for personalized content engines. As AI infrastructure spending concerns mount, the industry may see a shift in capital expenditure toward securing long-term storage contracts rather than spot-market purchasing. Watch for Seagate’s gross margins to potentially exceed 57% in fiscal 2027 as a signal of sustained pricing power during the supply crunch.

Seagate's Mozaic 4+ platform, built on heat-assisted magnetic recording (HAMR) technology, has become the focal point of the company's strategy to capture AI-driven storage demand. In July 2025, Seagate reported that its Mozaic 4+ drives had reached volume production and were shipping to hyperscale customers, marking the first commercial HAMR deployment at scale in the HDD industry. Western Digital, meanwhile, has pursued a parallel path with its ePMR (energy-assisted perpendicular magnetic recording) architecture, announcing in early 2025 that its 32TB UltraSMR drives were shipping to major cloud providers ahead of its planned transition to HAMR in later generations. The two companies together control roughly 80% of the global HDD market, making their production roadmaps critical to whether the projected supply gap materializes or widens.

Morgan Stanley's supply-shortage thesis aligns with broader analyst consensus on storage pricing dynamics. In a June 2025 note, Morgan Stanley raised its price target on Seagate to $145, citing sustained nearline demand from AI training clusters and flagging that lead times for high-capacity nearline drives had stretched beyond 12 weeks. The firm also noted that Western Digital's spin-off of its flash memory business (completed in February 2024 as Sandisk) had sharpened investor focus on the HDD segment's standalone margin profile. Western Digital's fiscal Q3 2025 earnings call in April confirmed that nearline exabyte shipments grew 25% year over year, driven primarily by hyperscaler procurement for AI inference and data lake expansion.

The technical race between HAMR and ePMR carries direct implications for streaming infrastructure operators planning long-term archival strategies. Seagate has published internal benchmarks showing Mozaic 4+ achieving areal densities above 3 terabits per square inch, a figure that enables 44TB per drive in a standard 3.5-inch form factor. Western Digital's competing approach has reached approximately 2.7 Tb/in² with its current ePMR generation, with the company targeting HAMR-based drives exceeding 40TB for initial customer qualification in late 2026. For streaming platforms managing petabyte-scale content libraries and AI model training datasets, the supply constraint means that drive procurement decisions made in the next 12 to 18 months will likely determine storage cost structures through 2028.