Hard disk drives (HDDs) have been proven and trusted for decades. They are the cornerstone of data centers, enterprises, and creative studios worldwide. This technology, using rotating platters and read/write heads, has been continuously improved over decades to achieve reliability, massive capacity, and long-term data storage.

Modern HDDs, such as the Western Digital Ultrastar series, with single-pane capacities up to 32TB, are the foundation of hyperscale data centers and enterprise storage infrastructure. With technologies such as energy-assisted perpendicular magnetic recording (ePMR) and heat-assisted magnetic recording (HAMR), HDD capacity continues to increase while maintaining cost advantages.