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Head positioning apparatus and method therefor

Imported: 23 Feb '17 | Published: 22 Oct '02

Yoshikazu Onuki, Hideaki Ishioka

USPTO - Utility Patents

Abstract

A head positioning control apparatus and method which compensates for positional deviation of a magnetic head with respect to the positioning of the head on a particular track of a disc recording medium via a tracking control. Additionally, during a seek mode of the apparatus, a head that was positioned as a result of the tracking control is moved to a neighboring track of the disc recording medium. The seek mode uses the information obtained during the tracking mode to correct any disturbance frequencies occurring in synchronism with the rotational frequency of the disc recording medium, even if the head travels over a large distance.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings:

FIG. 1 is a block diagram used for describing the principle of an AFC control system;

FIG. 2 is a block diagram illustrating the configuration of a conventional magnetic disc apparatus;

FIG. 3 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a first embodiment;

FIG. 4 is a flow chart illustrating an AFC calculation processing procedure in a tracking mode;

FIG. 5 is a flow chart illustrating an AFC calculation processing procedure in a seek mode;

FIG. 6 is a flow chart illustrating an AFC calculation processing procedure in the seek mode according to another embodiment;

FIG. 7 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a second embodiment;

FIG. 8 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a third embodiment;

FIG. 9 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a fourth embodiment;

FIG. 10 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a fifth embodiment; and

FIG. 11 is a block diagram illustrating the configuration of a magnetic disc apparatus according to a sixth embodiment.

Claims

1. A head positioning control apparatus comprising:

2. The head positioning control apparatus according to claim 1, wherein said frequency correcting means divides said disturbance frequency into a plurality of frequency components for each predetermined level, and generates said frequency correction coefficients for correcting a predetermined number of frequency components within said plurality of frequency components.

3. The head positioning control apparatus according to claim 1, wherein

4. A head positioning control method comprising the steps of:

5. The head positioning control method according to claim 4, wherein said step of generating frequency correction coefficients includes dividing said disturbance frequency into a plurality of frequency components for each predetermined level, and correcting a predetermined number of frequency components within said plurality of frequency components based on said frequency correction coefficients.

6. The head positioning control method according to claim 4, wherein said step of generating frequency correction coefficients includes dividing said disc recording medium in a radial direction into a plurality of regions, assigning each of said regions for one of said frequency correction coefficients generated when said tracking control is performed, and storing said frequency correction coefficients in a storage means; and