Head mechanism control apparatus, disk drive, and head unload co

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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G11B 2102

Patent

active

061081574

ABSTRACT:
The invention relates to a head mechanism control apparatus for magnetic recording device which ensures that the transducer head has been unloaded in a head unloading operation. A head slider having a transducer head is mounted on a head arm and is unloaded from the disk by the swinging of the head arm. The retract position is at the limit portion of the swingable range of the head arm. When the head slider is successfully unloaded to the retract position, a drive force applied to the head arm in the unload direction causes little movement of the head arm. After an unloading is performed, a position check drive force is applied to the head arm and the moving speed of the head slider is detected. Based on the moving speed, it is judged whether the head slider has been unloaded to the retract position. If the head slider has not been unloaded to the retract position, re-unloading is performed for moving the head slider to the retract position.

REFERENCES:
patent: 5455723 (1995-10-01), Boutaghou et al.
patent: 5969899 (1995-10-01), Utenick et al.

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