Circuit board, drive motor, and mechanical frame

Circuit board.
It contains all of the electronics to handle the data read from or written to the diskette and also controls the stepper-motor control circuits used to move the read/write heads to each track, as well as the movement of the read/write heads toward the diskette surface.

Drive Motor.
Drive motor is a very small spindle motor which is connected with metal hub at the center of the diskette, spinning it at either 300 or 360 rotations per minute (RMP).

Mechanical Frame
It is a frame in which a system of levers that opens the little protective window on the diskette to allow the read/write heads to touch the dual-sided diskette media. An external button allows the diskette to be ejected, at which point the spring-loaded protective window on the diskette closes.

Read/write heads and steeper motor

Read/Write Heads: Established on both sides of a diskette, the read/write heads move together on the same assembly. The heads are not directly opposite each other in an effort to prevent interaction between write operations on each of the two media surfaces. The same head is used fro reading and writing, while a second, wider head is used for erasing a track just prior to it being written. This allows the data to be with the analog data on an adjacent track.

Steeper Motor: This motor creates a precise number of stepped revolutions to move the read/write head assembly is fixed firmly to the stepper motor shaft.