Unlock instant, AI-driven research and patent intelligence for your innovation.

Magnetic disk device

A magnetic disk device and actuator technology, which is applied in the direction of the transducing head device, alignment of the magnetic track on the magnetic disk, magnetic recording, etc., and can solve the problem of difficult positioning of the magnetic disk device to the predetermined track.

Active Publication Date: 2020-11-17
KK TOSHIBA +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the head is changed to another head, it becomes difficult for the magnetic disk device to position each head on a predetermined track.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetic disk device
  • Magnetic disk device
  • Magnetic disk device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0032] figure 1 It is a schematic diagram showing an example of the configuration of the magnetic disk device 1 according to the first embodiment.

[0033] The magnetic disk drive 1 includes a housing HS, a head disk assembly (HDA) 10, a driver IC 20, a head amplifier integrated circuit (hereinafter referred to as a head amplifier IC or a preamplifier) ​​30, a volatile memory 70, a buffer memory (cache) 80, a The volatile memory 90 and the system controller 130 as a one-chip integrated circuit. In addition, the magnetic disk device 1 is connected to a host system (hereinafter simply referred to as a host) 100 . figure 1 A cross section of HDA10 is shown.

[0034] The HDA 10 has a magnetic disk (hereinafter referred to as disk) DK, a spindle motor (hereinafter referred to as SPM) 13 that rotates disk DK around a spindle 12 , an arm AM on which head HD is mounted, and a voice coil motor (hereinafter referred to as VCM) 14 . SPM13 and VCM14 are fixed to case HS. The disk DK i...

Deformed example 1

[0085] The configuration of the disturbance suppression processing system SY2 of the magnetic disk device 1 according to Modification 1 is different from that of the above-mentioned embodiment.

[0086] Figure 12 It is a block diagram showing an example of an interference suppression processing system SY2 according to Modification 1.

[0087] The interference suppression processing system SY2 further includes a gain G3, a gain G4, a storage area SR2, and a calculation unit C4. The storage area SR2 may be, for example, a memory or the like.

[0088] The filter FT calculates the suppression amount Uls0, and outputs the suppression amount Uls0 to the storage area SR1, the gain G3, and the storage area SR2. Inhibition amount Uls0 and Figure 8 The indicated inhibition amounts Uls correspond to. The gain G3 is input to the suppression amount Uls0. The gain G3 outputs the suppression amount Uls1 obtained by multiplying the suppression amount Uls0 by the variable gain to the co...

Deformed example 2

[0096] The configuration of the disturbance suppression processing system SY2 of the magnetic disk device 1 according to Modification 2 is different from that of the above-mentioned embodiment.

[0097] Figure 15 It is a block diagram showing an example of an interference suppression processing system SY2 according to Modification 2.

[0098] Interference suppression processing system SY2 and Figure 12 The interference suppression processing system SY2 shown does not have the storage area SR2 in comparison.

[0099] The filter FT calculates the suppression amount Uls0, and outputs the suppression amount Uls0 to the gain G3 and the gain G4. The gain G3 is input to the suppression amount Uls0. The gain G3 outputs the suppression amount Uls1 obtained by multiplying the suppression amount Uls0 by the variable gain to the computing unit C4. The gain G4 is input to the suppression amount Uls0. The gain G4 outputs the suppression amount Uls2 obtained by multiplying the suppres...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An embodiment of the invention provides a magnetic disk device capable of improving the precision of servo control. The magnetic disk device according to an embodiment of the present invention is provided with a disk having a first surface and a second surface on the opposite side to the first surface; a first head that performs read / write processing on the first surface; a second head that performs read / write processing on the second surface; an actuator that positions the first head and the second head on the disk; and a controller that controls the actuator on the basis of a first value that suppresses an interference component, the controller adjusting the first value on the basis of at least one of a correction of a phase and a ratio of a first amplitude of the first head to a secondamplitude of the second head when the actuator is changed from the first head to the second head at a first timing.

Description

[0001] This application is a divisional application of the application with the application number 201810605644.1, the application date is June 13, 2018, and the invention title is "Disk Device and Actuator Control Method". technical field [0002] Embodiments of the present invention relate to magnetic disk devices. Background technique [0003] A magnetic disk device includes at least one disk and a head. When a plurality of discs vibrate due to disturbance or the like, the plurality of heads may deviate to different positions. Therefore, when the head is changed to another head, it becomes difficult for the magnetic disk device to position each head on a predetermined track. Contents of the invention [0004] Embodiments of the present invention provide a magnetic disk drive capable of improving the accuracy of servo control. [0005] The magnetic disk device according to this embodiment includes: a disk having a first surface and a second surface opposite to the firs...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/596G11B21/02G11B21/08
CPCG11B5/59683G11B21/025G11B21/083G11B5/5547G11B5/5582G11B5/59622G11B5/59694G11B5/5556
Inventor 须藤大辅
Owner KK TOSHIBA