Apparatus for positioning magnetic head and method of the same

Details Apparatus for positioning magnetic head and method of the same Apparatus for positioning magnetic head and method of the same

1997-03-25

1999-11-16

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 60, 360 7804, G11B 2102

Patent

active

059868457

ABSTRACT:
An apparatus for positioning a magnetic head includes a servo signal detection circuit for detecting a servo signal recorded on a magnetic disk in a predetermined first period, an acceleration measuring portion which is fitted to a part of a mechanism for mounting a magnetic head, outputs an acceleration signal in a direction of positioning the magnetic head, and samples the acceleration signal in a second period shorter than the first period, a comparison processing portion for comparing a deviation value computed from at least either one of the acceleration signal and the servo signal with a predetermined value, a write inhibit signal generating portion for generating a signal inhibiting write of data on a magnetic disk in accordance with the result of comparison in the comparison processing portion, and a manipulated variable compensation portion for generating manipulated variable for adjusting the position of the magnetic head from at least either one of the servo signal and the acceleration signal and a target value of the position of the magnetic head, whereby to prevent erroneous write operation of data onto a magnetic disk due to unsteady positioning error of the magnetic head.

REFERENCES:
patent: 4956831 (1990-09-01), Sarraf et al.
patent: 5257255 (1993-10-01), Morimoto et al.
patent: 5426545 (1995-06-01), Sidman et al.
patent: 5452612 (1995-09-01), Smith et al.
patent: 5521772 (1996-05-01), Lee et al.

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