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. 16, 1986
Filed:
Feb. 21, 1984
Ben Alaimo, Campbell, CA (US);
Robert F Couse, Saratoga, CA (US);
SyQuest Technology, Fremont, CA (US);
Abstract
Disclosed is a servo control apparatus for controlling a servo means that positions a recording head over a disk-shaped data storage medium. If the disk-shaped data storage medium is improperly mounted on a disk drive causing wobble of the disk as it turns, then the problem of runout occurs so that each of the tracks of data on the disk do not pass directly under the head throughout the whole rotation of the disk. The present invention provides a reference track near the outside circumference of the disk on which reference data is stored in a plurality of bursts spaced around the reference track. The servo control apparatus detects the reference data for each of the bursts and calculates the position of the centerline of the reference track with respect to the head for each of the bursts. From this calculation for 8 bursts spaced around the reference track, a computer means generates a runout factor which is used to control the servo means to position the head compensating for runout for each of the data tracks on the disk.