Explain how data is read and written on a hard disk?

Explain how data is read and written on a hard disk?

- In a hard disk information / data is written on the rotating platters by the read and write heads.

- The heads are not in actual contact with the disk they are actually slightly above the magnetic surface of the platter.

- The heads detects the magnetization of the platter right below them. The actuator arm aids the heads in covering the platter area.

- The surface is divided into micro sized areas known as magnetic domains. Every magnetic domain has a magnetic dipole which has their own field.

- The write heads read/write by magnetizing the area. It generates a strong magnetic field for this purpose.