Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-05-31
2008-10-14
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07436616
ABSTRACT:
A method and device for parking heads of a disk drive device involves receiving a command to immediately park the heads. A first pulse is provided to a voice coil motor causing the heads to move toward a parked position. After the first pulse, the VCM current is reduced substantially (e.g., close to zero) and back EMF in the voice coil motor is measured to determine speed of the heads. The voice coil motor is iteratively pulsed, and back EMF is measured between pulses to track a desired velocity profile to park the heads.
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Hansen Fred R.
Tanner Brian K.
Schwegman Lundberg & Woessner, P.A.
Toshiba Corporation
Tzeng Fred
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