Magnetic disk drive with flying height control, control...

Details Magnetic disk drive with flying height control, control... Magnetic disk drive with flying height control, control...

2006-03-08

2008-11-25

Feild, Joseph (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S078080, C360S294700

Reexamination Certificate

active

07457069

ABSTRACT:
Embodiments of the invention prevent a magnetic head from coming into contact with a protrusion on a magnetic disk. In one embodiment, a head gimbal assembly includes a piezoelectric actuator for changing the flying height of a head/slider assembly. The address of a protrusion on a magnetic disk is preregistered in a nonvolatile memory. When a seek operation or following operation is to be performed, the head/slider assembly flies at a reference flying height. Before the protrusion passes below the head/slider assembly, an operating voltage is applied to the piezoelectric actuator to increase the flying height. After the protrusion passes below the head/slider assembly, the head/slider assembly flies at the reference flying height with operating voltage application stopped.

REFERENCES:
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patent: 6504662 (2003-01-01), Sobey
patent: 6567229 (2003-05-01), Mallary et al.
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patent: 6798605 (2004-09-01), Kurita et al.
patent: 2002/0054447 (2002-05-01), Kurita et al.
patent: 10-069747 (1998-03-01), None
patent: 10-233070 (1998-09-01), None

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