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. 24, 2026
Filed:
Feb. 18, 2025
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Gabor Szita, Mountain View, CA (US);
Anton Gerasimov, Santa Clara, CA (US);
Li Zhang, Fremont, CA (US);
Gary W. Calfee, Santa Clara, CA (US);
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Abstract
Self-servo write (SSW) is performed in a disk drive while rotating disks at an SSW rotational speed, such that the resultant product servo patterns have near-zero coherent runout when rotating the disks at an operational rotational speed. The natural uncontrolled path of a magnetic head of the drive is characterized at the operational rotational speed and at the SSW rotational speed, and the difference between the two uncontrolled paths is injected into the servo loop to modify the path of the magnetic head during the SSW process. Specifically, the natural uncontrolled path of the magnetic head of the drive at the normal operating rotational speed is characterized with a first set of non-circularity values, and the natural uncontrolled path of the magnetic head of the drive at the SSW rotational speed is characterized with a second set of non-circularity values.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile