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:
Mar. 06, 2001
Filed:
Apr. 30, 1998
Raffi Codilian, San Dimas, CA (US);
Ara W. Nazarian, Tustin, CA (US);
Brian Tanner, San Jose, CA (US);
Western Digital Corporation, Irvine, CA (US);
Abstract
A disk drive with a disk having a servo pattern including a special “calibration track” wherein a plurality of staggered calibration burst pairs define null points that are radially shifted from a burst pair centerline by precise, predefined, fractional track amounts to collectively provide accurate information about servo signal values generated as a function of real displacement. The staggered calibration bursts beneficially allows for calibrating the PES signal after the drive is removed from the servowriter during a manufacturing phase called Intelligent Burn-In. The staggered calibration bursts are preferably written in data regions so that they are disposable and may be selectively written over with data to maximize storage space. Some or all of the calibration bursts may alternatively be retained for a subsequent recalibration.