US 11,705,154 B2
Manufacturing method of magnetic disk device and magnetic disk device
Takahiro Magome, Yokohama Kanagawa (JP); Satoshi Yamashita, Yokohama Kanagawa (JP); and Takahiro Aoki, 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 Mar. 15, 2022, as Appl. No. 17/695,579.
Claims priority of application No. 2021-153431 (JP), filed on Sep. 21, 2021.
Prior Publication US 2023/0088258 A1, Mar. 23, 2023
Int. Cl. G11B 5/596 (2006.01); G11B 5/84 (2006.01); G11B 5/60 (2006.01)
CPC G11B 5/59661 (2013.01) [G11B 5/59666 (2013.01); G11B 5/6029 (2013.01); G11B 5/84 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A manufacturing method of a magnetic disk device comprising a plurality of magnetic disks integrally rotated, the plurality of magnetic disks having a plurality of recording surfaces, and a plurality of magnetic heads corresponding to the plurality of recording surfaces integrally moved in a radial direction of the plurality of magnetic disks,
wherein the manufacturing method includes
measuring an initial value of a clearance at a first position between a blank first recording surface among the plurality of recording surfaces and a first magnetic head corresponding to the first recording surface among the plurality of magnetic heads,
estimating a first distribution that is a distribution in the radial direction of an initial value of a clearance between the first recording surface and the first magnetic head based on the measured initial value of the clearance at the first position of the first recording surface,
recording a plurality of first spiral signals on the first recording surface by using the first magnetic head while controlling a clearance between the first recording surface and the first magnetic head by using first data that is the estimated first distribution,
measuring a second distribution that is a distribution in the radial direction of an initial value of a clearance between a blank second recording surface different from the first recording surface among the plurality of recording surfaces and a second magnetic head corresponding to the second recording surface among the plurality of magnetic heads under positioning control using the plurality of first spiral signals recorded on the first recording surface,
recording the plurality of first spiral signals on the second recording surface using the second magnetic head while controlling a clearance between the second recording surface and the second magnetic head using the measured second distribution, and
recording a plurality of second spiral signals on a third recording surface different from any of the first recording surface and the second recording surface among the plurality of recording surfaces using a third magnetic head corresponding to the third recording surface among the plurality of magnetic heads under positioning control using the plurality of first spiral signals recorded on the second recording surface.