Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-04-11
2006-04-11
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S125330
Reexamination Certificate
active
07027251
ABSTRACT:
A method and apparatus to control the amount by which thermal expansion causes a write head to extend toward a disk is provided. In one aspect, a single write operation uses two or more different write currents. A first write current is initially used, and is large enough to achieve desired magnetic flux at the disk. After the write current heats and expands the arm tip, and extends it toward the disk surface, the write current is reduced, to avoid or postpone the time at which thermal expansion might cause the tip to contact the disk, or cause other undesirable effects.
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Darragh Neil
Emo Bruce
Moline Jerry
Hansra Tejpal S.
Hudspeth David
Maxtor Corporation
Tzeng Fred F.
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