公开(公告)号：US20240096360A1

公开(公告)日：2024-03-21

申请号：US18182586

申请日：2023-03-13

申请人： Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

发明人： Hiroshi TANI ,  Kazuhiko TAKAISHI

IPC分类号： G11B5/596

CPC分类号： G11B5/59688

摘要： According to one embodiment, a magnetic disk device writes a plurality of simulated reference patterns to the magnetic disk on write conditions different from each other, detects a write state of each of the simulated reference patterns, selects one of the write conditions according to detection results, and writes a plurality of regular reference patterns which become criteria for predetermined processing to be executed on the magnetic disk to the magnetic disk on the selected write condition.

公开(公告)号：US20210082461A1

公开(公告)日：2021-03-18

申请号：US16803339

申请日：2020-02-27

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

发明人： Hiroshi TANI ,  Hiroyuki SUZUKI

IPC分类号： G11B5/55 ,  G11B20/18

摘要： A magnetic disk device includes a magnetic disk, a first read element, a second read element, and a controller. In the magnetic disk, first servo information is written. The controller controls the servo writing of second servo information on the magnetic disk, based on the first servo information. In addition, the controller controls acquisition of the first servo information by the first read element. The controller switches a read element to be used to control the servo writing from the first read element to the second read element based on quality of the first servo information acquired by the first read element.