US 12,308,055 B2
Magnetic disk device
Nobuhiro Maeto, Yokohama Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Nov. 21, 2023, as Appl. No. 18/515,762.
Application 18/515,762 is a continuation of application No. 17/865,226, filed on Jul. 14, 2022, granted, now 11,862,213.
Claims priority of application No. 2022-028065 (JP), filed on Feb. 25, 2022.
Prior Publication US 2024/0087603 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/09 (2006.01); G11B 5/596 (2006.01); G11B 15/087 (2006.01); G11B 20/12 (2006.01)
CPC G11B 5/59644 (2013.01) [G11B 20/1217 (2013.01); G11B 2020/1281 (2013.01); G11B 2220/2516 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a disk that includes a track including a first servo sector and a second servo sector that is different from the first servo sector;
a head that includes a write head that writes data to the disk, and a first read head and a second read head that read data from the disk; and
a controller that calculates first signal strength data related to a signal strength at which first target servo data that is a target of the first servo sector is read by the first read head, calculates second signal strength data related to a signal strength at which the first target servo is read by the second read head, and calculates first averaged signal strength data in which the first signal strength data and the second signal strength data are averaged,
wherein
the controller records first averaged signal strength record data related to the first averaged signal strength data, and calculates first standardized data by standardizing based on the first averaged signal strength record data when the first averaged signal strength data is calculated.