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:
Sep. 29, 2026
Filed:
Aug. 08, 2025
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Tatsuhiko Toyosaki, Yokohama, JP;
Takao Furuhashi, Kawasaki, JP;
Shuuichi Kojima, Tokyo, JP;
Kaori Kimura, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Abstract
A magnetic disk device is a magnetic disk device in which data write is performed by a thermal assist method, the magnetic disk device including: a magnetic disk that includes a plurality of tracks; and a controller that controls the magnetic disk device, wherein the controller measures, every a first period, a deviation amount from a reference height of a surface of the magnetic disk with respect to a track in which a duty ratio is equal to or greater than a predetermined value, the duty ratio being a time ratio at which data write is performed per unit time, among the plurality of tracks, and flattens the surface of the magnetic disk in a case where the deviation amount becomes equal to or greater than a first value.