Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-25
2006-04-25
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07035038
ABSTRACT:
A disk-shaped magnetic recording medium having a reference track and a plurality of data tracks is rotated by a motor which generates an index signal at a predetermined position. A magnetic head is slightly moved in the radial direction of the medium for each predetermined unit distance smaller than the data track width, and a reproduction output amplitude measuring circuit measures the reproduction output amplitude of a signal read from the data track for each index signal. A CPU obtains a position where the amplitude has the maximum value based on the number of head movements and the amplitude at that time so as to control data track positioning. Further, the CPU calculates a relative position between the data track position and the reference track position to perform reference track positioning. The data or reference track positioning of the magnetic head can be performed accurately in a short time.
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Hudspeth David
Slavitt Mitchell
Wenderoth , Lind & Ponack, L.L.P.
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