Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-04-30
1993-02-23
Smith, Jerry
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, 360 7807, 369 32, G11B 2102, G11B 555
Patent
active
051895714
ABSTRACT:
A method for optimizing settle characteristics of a read/write head on a data track on a rotating disk of a hard disk drive following a seek to the data track wherein each data track is assigned to a selected on of a plurality of concentric zones defined on the surface of the disk. Seeks are performed by a servo system in relation to a compensated velocity demand profile that provides velocities the head is to have at selected distances from a destination track and is selected for each zone by adding a velocity increment specific to the zone to a stored velocity demand profile for movement of the head in one direction and subtracted from the stored velocity demand profile for movement in the opposite direction. The velocity increment is selected to cause oppositely directed movements of the head in each zone for a selected demand velocity taken from the stored velocity demand profile to occur at equal speeds when added to the selected demand velocity for movement in one direction and subtracted from the selected demand velocity for movement in the opposite direction. The servo AGC is adjusted for each zone to cause the average of actual velocities of head movement in opposite directions to be equal to the selected demand velocity.
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Genheimer Stephen R.
Murphy Robert D.
Garland Steven R.
Heller III Edward P.
McCarthy Bill D.
Seagate Technology Inc.
Smith Jerry
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