Platter
The platter is made of glass and then coated with a magnetic coating. These platters usually have a maximum of four or five plates. The smaller the platter, the better the reliability.
Power connector
The power for the hard disk is 12v 5v. For notebook computers, 5v is used… The power connector heads provided for the hard disk are called Molex connectors.
Ribbon cable
The ribbon cable connects to the logic board. Converts any analog signal read by the hard disk onto a logic board and converts it into a digital signal.