Magnetic disk apparatus

A magnetic disk device, magnetic disk technology, applied in magnetic recording, configuration/installation of recording head, instruments, etc., can solve problems such as unstable seek control

Active Publication Date: 2018-10-09
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In a magnetic disk device, when the VCM resistance changes due to heat generation during seeking, or the equivalent curren

Method used

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  • Magnetic disk apparatus
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Embodiment Construction

[0013] Hereinafter, the magnetic disk device according to the embodiment will be described in detail with reference to the attached drawings. In addition, this invention is not limited by these embodiment.

[0014] figure 1 (a) is a plan view showing the seek operation of the magnetic head on the magnetic disk according to the embodiment, figure 1 (b) is a block diagram showing a schematic configuration of the magnetic disk device according to the embodiment.

[0015] exist figure 1 (a) and figure 1 In (b), the magnetic disk 2 is provided in the magnetic disk device, and the magnetic disk 2 is supported by the housing 1 via the spindle 10 .

[0016] In addition, a head slider (head slider) HM is provided in the magnetic disk device, and a write head HW and a read head HR are provided on the head slider HM as magnetic heads. The write head HW and the read head HR are arranged to face the magnetic disk 2 . The head slider HM is held on the magnetic disk 2 via a suspension ...

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PUM

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Abstract

The invention provides a magnetic disk apparatus capable of stabilizing seek control. A VCM resistance estimation unit (9A) estimates a VCM resistance in a voice coil motor (4) based on an acceleration and a velocity of a magnetic head with a VCM voltage saturated, and an equivalent current force constant estimation unit (9B) estimates an equivalent current force constant of the voice coil motor (4) based on the acceleration and the velocity of the magnetic head with the VCM voltage saturated. A seek control unit (9C) performs a seek control based on the VCM resistance and the equivalent current force constant of the voice coil motor (4).

Description

[0001] This application enjoys the priority of the earlier application with Japanese Patent Application No. 2017-52225 (filing date is March 17, 2017). This application incorporates the entire content of the earlier application by referring to this earlier application. technical field [0002] Embodiments of the invention generally relate to magnetic disk devices. Background technique [0003] In the magnetic disk device, when the VCM resistance changes due to heat generation during seek, or the equivalent current constant changes due to characteristic variation of components and / or environmental changes, seek control may become unstable. Contents of the invention [0004] One embodiment of the present invention provides a magnetic disk device capable of stabilizing seek control. [0005] According to one embodiment of the present invention, a magnetic disk, a magnetic head, a voice coil motor, a drive circuit, a VCM resistance estimating unit, and an equivalent current f...

Claims

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Application Information

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IPC IPC(8): G11B5/55
CPCG11B5/5547
Inventor 须藤大辅原武生
Owner KK TOSHIBA
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