The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 1990
Filed:
Jan. 13, 1989
NEC Corporation, Tokyo, JP;
Abstract
A track-following control system for a magnetic disk drive according to the present invention includes a magnetic disk, a magnetic head, a position error signal generator, a controller, and a stepping motor. One or more track position signals indicating a position of a track are recorded in the magnetic disk in numbers of sectors. The magnetic head writes and reads out normal data in and from the magnetic disk, and reads out the track position signal from the magnetic disk in the same manner. The position error signal generator generates a position error signal indicating a position error between the magnetic head and the track based on a track position signal. The controller calculates intra-sector errors by calculating an average position error of each sector and a desired number of estimated position errors of the corresponding sector by interpolation. Then, the controller produces, in numbers of the secotrs, position error signals having a larger number than that of the sectors by using a position error signal supplied from the position error signal generator. The stepping motor 18performs positioning of the magnetic head in accordance with the position error signals having the larger number than that of the sectors.