A magnetic disc storage apparatus including a magnetic head for reading information
from a storage track on a magnetic storage disc driven to spin, a voice coil motor
for moving the magnetic head above the disc, and a magnetic head drive system for
executing a position control of the magnetic head by controlling driving current
of the voice coil motor by a feedback control while monitoring a state of reading
the magnetic head in which the magnetic head drive system includes multi-mode driving
means for executing a linear drive mode for controlling, as an analog amount, the
driving current of the voice coil motor when an amount of driving to move the magnetic
head is small and executing a pulse drive mode for controlling, as a digital amount,
the driving current of the voice coil motor when the amount of driving to move
the magnetic head is large.
By the invention, both of high accuracy formation of position control of the
magnetic
head in tracking and high speed formation of access by shortening seek time are
enabled while effectively reducing heating or EMI inducing read/write error.
