The technology that uses magnets to store data on spinning platters is called hard disk drives (HDDs). These storage devices utilize magnetic recording to read and write digital data. Inside an HDD, data is stored on coated aluminum or glass platters that spin at high speeds. A read/write head moves across the surface of these platters to access the information. Although SSDs (solid-state drives) have become popular due to their speed, HDDs remain widely used for bulk storage due to their cost-effectiveness and large capacity for archival data.