What is the process by which sector markings are defined on a hard disk known as?

The process by which sector markings are defined on a hard disk is known as "low-level formatting." During this process, the disk is divided into sectors and tracks, establishing a structure for data storage. Low-level formatting creates the necessary markers that allow the disk's read/write heads to locate and access data efficiently. This step is typically performed by the manufacturer, and users usually interact with higher-level formatting when preparing a disk for use.