Computer Interfacing

Magnetic recording principles and methods

As already stated the head is positioned by a stepper

motor. This type of motor moves in specific increments

of so many degrees for each applied pulse. The program

that controls this motor must, therefore, generate a spe-

cific number of pulses in order to cause the stepper

motor to rotate through a particular angle. The position-

ing mechanism converts this rotation into the required

linear movement of the head across the tracks of the disk

to the one that has been selected. The head is then

loaded onto the disk, that is, it is lowered onto its sur-

face.

Once loaded, the track number is read to verif ...