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FLOPPY DISK DRIVE OPERATION
DENSITY AND COERCIVITY

Fire Controlman Volume 03-Digital Data Systems
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Figure  10-7.—A  typical  floppy  disk  drive. Drive Electronics Circuit Board Mounted to the disk drive is the drive electronics circuit board. This board contains the circuitry that (1) controls the electromechanical parts of the disk drive, (2) controls the operation of the read/write heads, and (3) interfaces the floppy disk drive to the disk controller in  the  computer. Connectors On the back of the drive electronics circuit board are at least two connectors. The 4-pin, in-line connector supplies  power  to  the  drive.  The  34-pin  edge  connector provides control signals to the drive and exchanges data between  the  drive  and  the  disk  controller  in  the computer. Head Actuator The head actuator assembly is a mechanical motor assembly that actually moves the heads over the disk. It does this by using a stepper motor. This motor moves in  very  small  fixed  increments  or  steps.  Each  increment of the stepper motor defines one track; therefore, if we want to read data on track 20, and the heads are at track 10, the stepper motor must be incremented 10 times to reach track 20. Read/Write Head Assembly Floppy  disk  drives  have  two  read/write  head assemblies, one for each side of the floppy disk. The heads are mounted on arms that connect to the head actuator assembly. Since the heads are mounted to a single head  actuator, they move in unison with each other. 10-9






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