US 12,230,305 B2
Magnetic disk device having heater to adjust spacing between magnetic disk and magnetic head
Masayuki Kondo, 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. 30, 2023, as Appl. No. 18/458,923.
Claims priority of application No. 2023-041995 (JP), filed on Mar. 16, 2023.
Prior Publication US 2024/0312479 A1, Sep. 19, 2024
Int. Cl. G11B 5/60 (2006.01); G11B 5/49 (2006.01); G11B 5/58 (2006.01); G11B 5/596 (2006.01); G11B 21/21 (2006.01); G11B 5/00 (2006.01); G11B 5/008 (2006.01)
CPC G11B 5/607 (2013.01) [G11B 5/4961 (2013.01); G11B 5/581 (2013.01); G11B 5/59638 (2013.01); G11B 21/21 (2013.01); G11B 2005/0021 (2013.01); G11B 5/00821 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a magnetic disk;
a magnetic head including a write element used to write data to the magnetic disk, a read element used to read data from the magnetic disk, and further including a heater which generates heat by electric power supplied thereto and expands the magnetic head toward the magnetic disk side; and
a controller which supplies, at the time of startup of data write, fixed additional electric power for an initial first time of a specified time while supplying steady electric power to the heater for the specified time, and supplies gradually-decreasing additional electric power for a remaining second time of the specified time, the steady electric power being used to make spacing between the magnetic disk and the magnetic head become saturated at a target value.