SanDisk's HDD business generates approximately $4.2B in annual revenue from nearline enterprise drives sold primarily to hyperscaler data centers for capacity storage (warm/cold tiers). The business operates as a virtual duopoly with Seagate, which provides structural pricing stability. Nearline HDD demand is driven by exponential data growth from cloud services, AI training datasets, and compliance archival requirements. Technology advances through HAMR (heat-assisted magnetic recording) and MAMR enable 30TB+ drives, maintaining HDD cost-per-TB advantages over SSDs for capacity workloads. The long-term risk is SSD cost convergence: as NAND costs decline, the crossover point where SSDs become cheaper per TB for all workloads approaches, though industry estimates suggest this remains 3-5+ years away for capacity tiers.
SanDisk and Seagate operate as a duopoly in the nearline HDD market for data center capacity storage, providing structural pricing stability
Nearline HDDs serve hyperscaler data centers for warm and cold storage tiers where cost-per-TB is the primary decision criterion. Major customers include AWS, Google, Microsoft, and Meta, who deploy millions of drives annually. Demand is driven by exponential data growth from cloud services, AI training dataset storage, compliance archival, and video streaming. Despite SSD adoption for hot/performance tiers, nearline HDD shipments have remained stable to growing as data creation outpaces storage substitution. The AI training data explosion is a net positive for HDD demand: massive datasets need to be stored cheaply, and HDD cost advantages for capacity storage remain significant.
Hyperscaler data center demand for nearline HDDs remains strong as data growth outpaces SSD substitution for capacity storage tiers