US 12,456,487 B1
Magnetic disk device and method
Tatsuhiko Toyosaki, Yokohama Kanagawa (JP); Takao Furuhashi, Kawasaki Kanagawa (JP); and Kaori Kimura, Yokohama Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Kawasaki (JP); and Toshiba Electronic Devices & Storage Corporation, Kawasaki (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Oct. 10, 2024, as Appl. No. 18/912,217.
Claims priority of application No. 2024-097158 (JP), filed on Jun. 17, 2024.
Int. Cl. G11B 5/596 (2006.01); G11B 20/18 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/59627 (2013.01) [G11B 20/18 (2013.01); G11B 2005/0021 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A magnetic disk device in which data writing is performed by a thermal assist method, the magnetic disk device comprising:
a magnetic disk to which positional information for each track is written;
an assist mechanism that heats the magnetic disk;
a magnetic head that performs data reading and data writing on the magnetic disk; and
a controller that controls the magnetic disk device, wherein
the controller is configured to
cause the magnetic head to read the positional information written to the magnetic disk to learn a correction amount of a positional deviation generated in synchronization with rotation of the magnetic disk,
in parallel with reading the positional information, cause, while supplying assist power to the assist mechanism to heat a learning target portion of the magnetic disk, the magnetic head to write a data pattern used for detection of a defective portion of the magnetic disk, and
while supplying the assist power to the assist mechanism to heat a writing target portion of the correction amount of the magnetic disk, cause the magnetic head to write the learned correction amount to the magnetic disk.