US 11,862,204 B2
Magnetic disk device and method
Kana Furuhashi, Kawasaki 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 Aug. 26, 2022, as Appl. No. 17/897,062.
Claims priority of application No. 2022-046432 (JP), filed on Mar. 23, 2022.
Prior Publication US 2023/0306987 A1, Sep. 28, 2023
Int. Cl. G11B 27/36 (2006.01); G11B 20/18 (2006.01); G11B 5/012 (2006.01); G11B 21/10 (2006.01)
CPC G11B 5/012 (2013.01) [G11B 21/106 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a magnetic disk including a track having a plurality of sectors;
a motor configured to rotate the magnetic disk;
a magnetic head; and
a controller configured to:
perform a first read operation of reading target sectors among the sectors of the track, with the magnetic head during a first revolution of the magnetic disk;
detect an off-track state of the magnetic head during the first revolution of the magnetic disk;
perform a first error correction with respect to data read from the target sectors during the first read operation; and
perform a second read operation of selectively reading a part of the target sectors for which the off-track state has been detected or for which the first error correction is unsuccessful, with the magnetic head during a second revolution of the magnetic disk.