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:
Jul. 20, 1999
Filed:
Mar. 24, 1997
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed is an off-track correcting method for a disk apparatus for measuring an off-track correction value by use of servo data on a data surface. The data surface on a disk medium is recorded with servo data for an off-track measurement. The data head seals a cylinder position recorded with the off-track measurement servo data. It is determined whether or not this cylinder position is a sensitivity abnormal position of the cylinder. The data head reads a first item of servo data after offset-moving the data head by a predetermined quantity on inner and outer sides of the disk medium, corresponding to detecting that the data head is located in the sensitivity abnormal position. An off-track correction value in the cylinder position is calculated from the plural pieces of first servo data read finally in a plurality of reading positions. This, even when enhancing a track density, the precise off-track correction value can be thereby measured.