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:
Jun. 23, 2026
Filed:
Apr. 09, 2025
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Nobuhiro Maeto, Yokohama Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Abstract
According to one embodiment, a controller of a magnetic disk apparatus calculates a first threshold for each of first positions. The first threshold is calculated based on quality of second positions. The second positions correspond to the first positions. During a write operation on the first track, the controller calculates a first amount and compares the first amount with a second threshold. The first amount is obtained by accumulating an excess amount of a squeeze amount over the first threshold for all second positions included in a range adjacent to a part in the circumferential direction where write by the write operation is completed. The squeeze amount is a narrowed amount of a width of the second track from a design value by the write operation. Interruption of the write operation and a protection operation of the second track are performed based on a result of the comparison.