Circuits, systems, and methods for capacitive fly height...

Details Circuits, systems, and methods for capacitive fly height... Circuits, systems, and methods for capacitive fly height...

2007-08-14

2007-08-14

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000

Reexamination Certificate

active

11325760

ABSTRACT:
Circuitry, systems, and methods for measuring the fly height of a read/write head in a magnetic data storage system. The circuitry generally includes a capacitance measurement circuit configured to measure the capacitance between the read/write head and the surface of the magnetic recording medium (or a derivative of that capacitance), and a fly height converter configured to produce an output signal corresponding to the fly height. The capacitance measurement circuit generally includes an input receiving a periodic signal with a generally constant voltage slew rate, coupled to the read/write head, and a current measuring circuit coupled to the read/write head. The present invention advantageously provides for electronically measuring the fly height of a read/write head in situ in a magnetic storage system. The sensed fly height may then be used by the system to control fly height actuation.

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Rahgozar et al., “Circuits, architechtures, apparatus, systems, and methods for maintaining constant spacing in a read/write apparatus for data storage,” U.S. Appl. No. 11/355,459, filed Feb. 15, 2006.

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