AI infrastructure isn’t powered by a single storage technology—it’s built on a tiered architecture designed to balance speed, scale, and cost at every stage of the AI lifecycle. From data ingestion and preparation to model training, inference, and long-term retention, different workloads demand different performance profiles. High-speed DRAM and SSDs accelerate active compute and real-time inference, while HDDs provide the massive, cost-efficient capacity required to store the growing volume of training data, logs, metadata, and AI-generated outputs. As AI scales, intelligent data tiering becomes essential to keeping infrastructure performant, economical, and sustainable.