How data is read and written on a hard disk

Question

Briefly describe how data is read and written on a hard disk?

Answer 1

• In a hard disk data or information is written on the rotating platters through the write and read heads.
• The heads are not in really contact with the disk they are really faintly above the magnetic surface of the platter.
• The heads identifies the magnetization of the platter right under them. The actuator arm assists the heads in covering the platter region.
• The surface is separated into micro sized areas termed as magnetic domains. All magnetic domains have a magnetic dipole that has their own field.
• The write heads read or write through magnetizing the area. It produces a strong magnetic field for this reason.