US 12,094,505 B2
Magnetic disk device and reference pattern writing method of the same preliminary class
Hiroshi Tani, Kawasaki Kanagawa (JP); and Kazuhiko Takaishi, Machida Tokyo (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 Mar. 13, 2023, as Appl. No. 18/182,586.
Claims priority of application No. 2022-147201 (JP), filed on Sep. 15, 2022.
Prior Publication US 2024/0096360 A1, Mar. 21, 2024
Int. Cl. G11B 20/18 (2006.01); G11B 5/55 (2006.01); G11B 5/596 (2006.01)
CPC G11B 5/59688 (2013.01) 9 Claims
OG exemplary drawing
 
1. A magnetic disk device comprising:
a magnetic head including a write element to be used to write data to a rotatable magnetic disk and a read element to be used to read data from the disk and movable in a radial direction of the magnetic disk; and
a controller which controls rotation of the magnetic disk and movement of the magnetic head, wherein the controller includes:
a first control section which makes the magnetic head seek in a radial direction of the magnetic disk, executes the seek of the magnetic head in a circumferential direction of the magnetic disk a plurality of times, and writes, when each of the seeks is within an acceleration range, a simulated reference pattern to the magnetic disk on one of write conditions differing from seek to seek by means of the write element;
a second control section which reads simulated reference patterns that correspond to the seeks and have been written to the magnetic disk by means of the read element;
a detecting section which detects a write state of each of the simulated reference patterns on the magnetic disk from each reading result of the second control section;
a selecting section which selects one of the write conditions according to detection results of the detecting section; and
a third control section which makes the magnetic head seek in the radial direction of the magnetic disk, executes the seek of the magnetic head in the circumferential direction of the magnetic disk a plurality of times, and writes, for each of the seeks, a regular reference pattern which becomes a criterion for predetermined processing to be executed on the magnetic disk to the magnetic disk on the write condition selected by the selecting section by means of the write element.