Data pattern for fly height measurement

Details Data pattern for fly height measurement Data pattern for fly height measurement

2008-06-27

2010-11-02

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000

Reexamination Certificate

active

07826166

ABSTRACT:
A hard disk drive that includes a disk and a head that is separated from the disk by a flying height. The disk drive also includes a circuit that determines the flying height from an equation that uses a third harmonic of a read signal. The read signal includes a data pattern that is a product of a first data pattern and a second data pattern. The resultant data pattern provides a third harmonic with a relatively high magnitude and improved signal to noise ratio.

REFERENCES:
patent: 5130866 (1992-07-01), Klaassen et al.
patent: 7199961 (2007-04-01), Wu et al.
patent: 7342736 (2008-03-01), Turner et al.
patent: 7715135 (2010-05-01), Sutardja et al.

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