Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-06-23
2000-02-15
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360105, 360 7801, 360 7804, 360 7812, 318561, G11B 2102
Patent
active
06025968&
ABSTRACT:
A data recording disk drive uses a circuit responsive to the removal of power to the spindle motor to generate a two-stage torque to retract the actuator and move it to a parking ramp. The spindle motor power removal circuit sends an initial signal to a first switch connected to a full-wave rectifier retract circuit and, after a predetermined delay time, a second signal to a second switch also connected to the rectifier circuit. Activation of the first switch causes only a portion of the available current from the spindle motor windings to reach the actuator, so that the actuator is moved with an initial low-level torque which is sufficient to bring the actuator to the disk OD of the disk under all circumstances. Activation of the second switch a predetermined delay time later allows all available current to reach the actuator so the actuator is then moved with a high-level torque which is sufficient to properly park the sliders on the load/unload ramp under all conditions. The spindle motor power removal circuit includes a resistor-capacitor (RC) circuit to generate the second signal. Selection of the desired delay time is made by design of the appropriate RC time constant of the RC circuit.
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Berthold Thomas R.
International Business Machines - Corporation
Psitos Aristotelis M.
Vann Joseph M
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