How a binary bits are stored in a magnetic disk?

Binary bits are stored on a magnetic disk by using magnetized regions on the disk's surface to represent data. Each bit is encoded as a magnetic orientation: a specific direction of magnetization represents a binary '1', while the opposite direction represents a binary '0'. When the disk spins, read/write heads detect these magnetic changes to retrieve or store data. The disk's surface is divided into tracks and sectors, allowing for organized storage and access of the bits.