Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1992-07-31
1997-08-12
Psitos, Aristolis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7807, G11B 5596
Patent
active
056571798
ABSTRACT:
A method for reducing noise during track seeking in a disc drive wherein transducers proximate the surfaces of discs of the drive are accelerated away from an initial track in a first sequence of successive time interval and subsequently decelerated toward a destination track in a second sequence of successive time intervals in proportion to the difference between the actual velocity of the transducers and a demand velocity for each of the intervals. The demand velocity in each time interval is the sum of the demand velocity for the previous interval and a velocity demand fraction of the difference between an adjusted profile velocity and the demand velocity for the previous time interval. The adjusted profile velocity is the difference between a stored profile velocity and an anticipator that is maintained at a selected value during acceleration of the transducers and decremented to zero during initial time intervals in which the transducers are decelerated. The velocity demand fraction is incremented from zero to a selected first maximum value during acceleration of the transducers and again incremented to a second maximum value during initial time intervals in which the transducers are decelerated.
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Heller III Edward P.
McCarthy Bill D.
McCarthy Randall K.
Psitos Aristolis
Seagate Technology Inc.
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