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:
Nov. 06, 2001
Filed:
Sep. 23, 1998
Bernd Lamberts, Cupertino, CA (US);
Mantle Yu, San Jose, CA (US);
International Business Machines, Armonk, NY (US);
Abstract
In a disk drive system, a servo controller is operative to perform a process of inhibiting write operations for writing data to tracks of a disk during a head settling period following a track seek operation. During each of a first plurality of sampling intervals transpiring during a first time period, the servo controller determines a present position value indicative of the position of the head during the present sampling interval, and also determines a predicted position value indicative of the position of the head during a subsequent sampling interval. Also during each of the first plurality of sampling intervals, the servo controller determines: whether the present position value is within a first error margin from the center of a target track; and whether the predicted position value is within the first error margin. If the present position value and the predicted position value are both within the first error margin, the servo controller enables write operations. During each of a second plurality of the sampling intervals transpiring during a second time period, the servo controller determines a predicted position value indicative of the position of the head during a subsequent sampling interval. Also during each of the second plurality of sampling intervals, the servo controller determines whether the predicted position value is within a second error margin from the center of the target track. If the predicted position value is not within the second error margin, the servo controller inhibits write operations.