US 12,230,297 B2
Magnetic disk device with enhanced control of write processing based on a shift in drift of level (DOL)
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 Aug. 29, 2022, as Appl. No. 17/897,911.
Claims priority of application No. 2022-022153 (JP), filed on Feb. 16, 2022; and application No. 2022-113281 (JP), filed on Jul. 14, 2022.
Prior Publication US 2023/0260540 A1, Aug. 17, 2023
Int. Cl. G11B 5/09 (2006.01); G11B 5/012 (2006.01); G11B 5/55 (2006.01); G11B 5/56 (2006.01); G11B 5/596 (2006.01)
CPC G11B 5/09 (2013.01) [G11B 5/012 (2013.01); G11B 5/5556 (2013.01); G11B 5/56 (2013.01); G11B 5/59627 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a disk;
a head configured to write data to the disk and read the data from the disk; and
a controller configured to control write processing based on a first determination value corresponding to a first shift amount defined for an excessive number of times at which the first shift amount of the head in a radial direction of the disk exceeds a first threshold value causing a read error in a second track adjacent to a first track in the radial direction at a time of the write processing of the first track of the disk, and a second threshold value causing a change to the write processing.