Patent ID: 6081400
Filing Date: 2000-06-27
Classification: G11B

Abstract:
A system including a storage unit having a magneto resistive head positioned on an actuator arm and a loading ramp, the storage unit for loading the magneto resistive head from a position adjacent to a surface of a magnetic disk to a position adjacent to the loading ramp, the storage unit comprising:a reset generator for asserting a reset signal;a switching circuit coupled to the reset generator for providing a limited reset signal for a first duration, and for providing a delayed reset signal for a second duration, in response to the reset signal;a spindle motor coupled to the magnetic disk and to the switching circuit for rotating the magnetic disk a first number of revolutions per minute, for creating an electro-motive force in response to the limited reset signal, and for rotating the magnetic disk a second number of revolutions per minute in response to the delayed reset signal;a first biasing circuit coupled to the actuator arm and to the spindle motor for biasing the magneto resistive head towards an edge of the magnetic disk in response to the electro-motive force;an energy storage device coupled to the reset generator for storing a biasing charge, and for outputting the biasing charge in response to the reset signal;a delay circuit coupled to the energy storage device and to the reset generator for delaying output of the biasing charge to form a delayed biasing charge in response to the reset signal; anda second biasing circuit coupled to the actuator arm and to the delay circuit for biasing the magneto resistive head towards the loading ramp in response to the delayed biasing charge.