HDDs come in 1.8, 2.5 and three.5 inch form components, as proven in Figure 1. The 3.5 inch form factor is standard for personal computer systems. 1.eight inch HDDs have been used in moveable media players and other mobile applications, however are seldom utilized in new units. The choice of motherboard kind issue determines how particular person parts attach to it, the kind of power supply required, and the shape of the pc case. Some producers also have proprietary form factors based mostly on the ATX design. This causes some motherboards, energy provides, and different elements to be incompatible with standard ATX cases.