Hard disk is a type of secondary memory which is used to store data for permanent time period. It can store data in the form of magnetic flux. Hard disk is consists of a circular plate known as platter which was made of aluminum glass or plastic. Both surface disk plate is coated with metallic oxide. The disk plate is fixed on a motor which rotates disk plate. For each platter there are two heads (upper surface and other for lower one0. Both heads are fixed on a head arm which is controlled by head actuator. The surface of this plate contains number of circle known as tracks. Section of tracks is known as sector. In hard disk data is stored from outer track to inner one. The read/write heads leaner magnetic flux one the disk plate. The read/write head acts as a magnet which leaves data signals in the form of magnetic charge.
No comments:
Post a Comment