International Business Machines Corporation

Tatsuya Endoh

Sri Muthuthamby Sri-Jayantha

Hiroaki Suzuki

Hien Phu Dang

Arun Sharma

Hideo Asano

Tetsuo Ueda

Kenji Okada

Takao Matsui

Kaoru Umemura

Masayuki Takeuchi

Masaomi Ikeda

Akira Shibata

Junji Hashimoto

An RW offset setting method which includes recording a test pattern by a write head, reading the test pattern by a read head, measuring an amplitude of a read back signal at each tracking position, finding an approximate expression of a profile of the measured amplitude, finding a tracking position, and finding a RW offset based on this tracking position, setting a RW offset for all tracks in the disk device based on the RW offsets about the plurality of tracks to be measured. A read data error recovery method that includes the steps of determining an off-track direction where the amplitude increases, searching an off-track position where the amplitude becomes a local maximum, measuring the amplitude at each off-track position reading data recorded in the data sector.

System and method for setting a read/write offset and for recovering from data read errors

A method and apparatus for adaptive resonance cancellation in a rotating storage system, includes designing a set of digitally selectable optimum resonance cancellation filters, generating a series of excitation signals for injection into the filters, generating a characteristic resonance frequency based on the excitation signals, and computing an address pointer corresponding to the resonance frequency, to select an optimum resonance cancellation filter.

Method and apparatus for adaptive resonance mode cancellation servo in a rotating storage system

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Fujisawa, Japan

Tatsuya Endoh