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Disk device

A magnetic disk device and magnetic disk technology, which is applied in the alignment of magnetic tracks on the magnetic disk, magnetic recording, configuration/installation of recording heads, etc., and can solve problems such as errors

Active Publication Date: 2021-10-26
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the gain is changed like this, an error may occur when estimating the gain of the microactuator

Method used

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Experimental program
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no. 1 Embodiment approach

[0016] figure 1 It is a block diagram showing an example of the configuration of the magnetic disk drive 1 according to the embodiment.

[0017] The magnetic disk device 1 is composed of a head-disk assembly (HDA) 10 , a head amplifier integrated circuit (hereinafter referred to as head amplifier IC) 16 , and a system on chip (SOC) 20 .

[0018] The HDA 10 has a magnetic disk 11, a spindle motor (SPM) 12, an arm 13, and a voice coil motor (VCM) PV as a first actuator. The magnetic disk 11 is rotated by the SPM 12 . A load beam 14 is attached to the front end of the arm 13 , and a magnetic head 15 is attached to the front end of the load beam 14 . The arm 13 is driven by the VCMPV to control the movement of the magnetic head 15 to a predetermined position on the magnetic disk 11 . In addition, a pair of piezoelectric elements (for example, Pb(Zr,Ti)O 3 ), namely PM, is arranged near the attachment portion of the load beam 14 at the front end portion of the arm 13 . By apply...

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Abstract

Embodiments provide a magnetic disk device capable of accurately obtaining a gain of a microactuator. The magnetic disk drive of embodiment has: the 1st actuator, makes the magnetic head that comprises magnetic head move; The 2nd actuator adjusts the position of magnetic head on the magnetic disk in the radial direction of magnetic disk; Determine the input amplitude when measuring the second transfer function based on the estimated value of the gain of the actuator and the amplitude of the input voltage to the second actuator when measuring the first transfer function, and calculate the second value based on the first transfer function and the second transfer function. The estimated gain value of the actuator is calculated, and the estimated gain value is updated using the calculated estimated gain value.

Description

[0001] Associate application [0002] This application enjoys the priority of the basic application based on Japanese Patent Application No. 2019-110485 (filing date: June 13, 2019). This application includes the entire content of the basic application by referring to this basic application. technical field [0003] Embodiments relate to magnetic disk devices. Background technique [0004] There is known a magnetic disk device equipped with a microactuator for micro-moving a magnetic head in the radial direction of the magnetic disk. The magnetic head can be precisely positioned with respect to the magnetic disk by the microactuator moving the magnetic head minutely at the time of reading / writing. In a magnetic disk device equipped with such a microactuator, it is necessary to grasp the gain (input-output ratio) of the microactuator for each magnetic head in order to perform positioning control of the magnetic head. [0005] However, in general, a magnetic disk device is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/596
CPCG11B5/59622G11B5/5552G11B5/4873G11B5/5534G11B5/5556G11B5/5578G11B5/5526G11B5/553G11B5/5582G11B5/5547
Inventor 松泽卓治
Owner KK TOSHIBA