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:
Feb. 16, 1993
Filed:
Jan. 30, 1990
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a composite servo system or a servo system using only a sector servo system, when a head switching mode is set during a read/write operation, a CPU checks whether the cylinder of a target track of a subsequent head after switching is the same as that of a target track of a preceding head. If the target tracks are located on the same cylinder, the CPU compares offset value data of a data surface corresponding to the head before switching with that of the head after switching. If an error, as a comparison result, falls within a predtermined allowable range, a read/write operation by the head after switching is continuously executed. The CPU generates correction data used for positional correction processing for positioning the head at the center of the target position of a hard disk and temporarily stores the correction data in a data memory. The CPU executes positional correction processing on the basis of the correction data stored in the data memory.