disk The track on the is a group of concentric circles with different recording densities. Magnetic surface memory The magnetic material layer is coated on the carrier of different shapes (such as disc, ribbon, etc.). When working, the magnetic head moves at a high speed against the loaded magnet, and reads and writes on the magnetic layer. The information is recorded on the magnetic layer, and the track of these information is the magnetic track. The magnetic tracks of a disk are concentric circles. See the figure on the right. The magnetic tracks of a tape are straight lines along the length of the tape. These tracks are invisible to the naked eye because they are only magnetized areas on the disk surface in a special way. The information on the disk is stored along these tracks. Adjacent tracks are not close to each other, because the magnetism will affect each other when the magnetization units are too close, and it will also bring difficulties to read and write the magnetic head. An old 1.44MB 3.5-inch floppy disk has 80 tracks on one side Track density Is much greater than this value, and there are usually thousands of tracks on one side. [1] The physical structure of hard disk is generally composed of magnetic head and disk, motor, main control chip, flat cable and other components; When the main motor drives the disc to rotate, the auxiliary motor drives a group of（ head ）Go to the corresponding disk and determine whether to read the front side or the back side of the disk. The head is suspended on the disk and draws a circular track concentric with the disk（ Magnetic track Or called cylinder ）At this time, the magnetic induction coil of the head senses the magnetism on the disk surface and uses the reading time or data interval specified by the hard disk manufacturer to locate a sector To obtain the data content of the sector; [1]
When the disk rotates, if the head is kept in a position, each head will draw a circular track on the disk surface. These circular tracks are called tracks. [1]
In a disc group composed of multiple discs, a cylindrical surface composed of multiple tracks in the same radius circle and faces of different discs. [1]
Each track on the disk is divided into several arc segments, which are the sectors of the hard disk. The first sector of the hard disk is called the boot sector. [1]
