A hard drive can be considered as consisting of three major assemblies. It can be divided neatly into the data platters and the motor which spins them inside the hard drive chassis, the read/write arm assembly and the printed circuit board (with all of the electrical components which commonly can be seen on the outside of the hard drive chassis).
The platters are coated with a chemical substrate which holds an electromagnetic signal which is essentially your data. These platters are spun at a constant speed by a DC motor (controlled by a chip on printed circuit board).
The read/write heads move across the surface of the platters (but during the normal course of events will never physically make contact with those platters) reading and writing the data. The motion across the surface of the platters is the same as that of an old-style stylus arm over a turntable.
The printed circuit board carries out all the signal processing as well as controlling the speed of platter motor. It also interfaces with the outside world, i.e. Your computer.
The remedial action needed to to carry out successful data retrieval will of course depend upon which particular area of the drive is affected by a failure.
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