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:
Oct. 28, 2025
Filed:
Oct. 10, 2024
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Tatsuhiko Toyosaki, Yokohama Kanagawa, JP;
Takao Furuhashi, Kawasaki Kanagawa, JP;
Kaori Kimura, Yokohama Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Abstract
A magnetic disk device includes a magnetic disk to which positional information for each track is written, an assist mechanism that heats the magnetic disk, a magnetic head that performs data reading and data writing on the magnetic disk, and a controller that controls the magnetic disk device. The controller is configured to cause the magnetic head to read the positional information written to the magnetic disk to learn a correction amount of a positional deviation generated in synchronization with rotation of the magnetic disk, in parallel with reading the positional information, cause, while supplying assist power to the assist mechanism to heat a learning target portion of the magnetic disk, the magnetic head to write a data pattern used for detection of a defective portion of the magnetic disk, and while supplying the assist power to the assist mechanism to heat a writing target portion of the correction amount of the magnetic disk, cause the magnetic head to write the learned correction amount to the magnetic disk.