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Magnetic disk device

A magnetic disk device and magnetic disk technology, applied in the direction of magnetic recording, magnetic recording head, manufacturing magnetic head surface, etc., can solve problems such as easy deterioration

Active Publication Date: 2021-11-19
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even in the case of reducing the thickness and spacing of the magnetic disk, for example, it is required not to increase the frequency of errors during data writing or reading due to the deterioration of the positioning accuracy of the magnetic head.
The positioning accuracy of the magnetic head is affected by the torsion (torsion) of the rotation shaft of the actuator when the magnetic head is driven. Therefore, the more the magnetic head is arranged on the cover side and the base side of the housing of the magnetic disk device, the easier it is to position the magnetic head. deterioration

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0021] As the magnetic disk device, a hard disk drive (hereinafter referred to as HDD) according to the first embodiment will be described in detail. figure 1 is a block diagram schematically showing the HDD according to the first embodiment, figure 2 It is a side view showing the magnetic head and magnetic disk in a levitating state.

[0022] Such as figure 1 As shown, the HDD 10 includes a rectangular housing 11, a magnetic disk 12 as a recording medium disposed in the housing 11, a spindle motor 21 for supporting and rotating the magnetic disk 12, and a data writing process for the magnetic disk 12. (write), read (read) a plurality of magnetic heads 16. The frame body 11 has a rectangular box-shaped base (not shown) with an open top, and a cover (not shown) covering the opening of the base. The base includes, for example, a rectangular bottom wall and side walls standing along the periphery of the bottom wall, and is integrally formed of aluminum or the like. The cover...

no. 2 Embodiment approach

[0065] In the second embodiment, the magnetic head 16 is tested for operational performance before being assembled in the HDD 10, and is classified into a plurality of groups based on the test results. In this embodiment, the error rate of the magnetic head 16 is detected. The error rate is a recording pattern that is recorded beyond a recording track adjacent to the recording track (hereinafter referred to as an adjacent recording track) in one recording (writing) operation of the recording track of the magnetic disk 12 with the write head 58 proportion.

[0066] Figure 10 It is a graph schematically showing the relationship between the recording count (Write count) and the error rate (Error Rate) for adjacent recording tracks. exist Figure 10 The magnetic heads 16 are classified into three groups A, B, and C, and the relationship between the number of recording times for adjacent recording tracks in each group and the error rate after the number of recording times is sc...

no. 3 Embodiment approach

[0072]In the third embodiment, the operation performance of the magnetic disk 12 is tested before being assembled in the HDD 10, and is classified into a plurality of groups according to the test result. In the present embodiment, an index value indicating the overwrite characteristic (OW) of the magnetic disk 12 is detected. The overwrite characteristic is indexed by the amplitude difference of the recording pattern before and after overwriting when a recording pattern of a frequency different from the recording pattern is overwritten on a recording pattern of a certain frequency, and the quality is judged based on the value ( writing difficulty). For example, in the case of perpendicular magnetic recording, it is more difficult to write a low-frequency signal than a high-frequency signal, so the incomplete disappearance signal when writing a low-frequency signal after writing a high-frequency signal is expressed in dB The obtained value may be used as an index of the overwr...

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Abstract

Embodiments provide a magnetic disk device capable of increasing recording capacity in consideration of positioning accuracy of a magnetic head. A magnetic disk device according to an embodiment includes: a plurality of magnetic disks that have recording layers and are arranged coaxially at intervals; and a plurality of magnetic heads having magnetic poles for generating a recording magnetic field in a vertical direction with respect to the recording layer, the plurality of magnetic heads being arranged so as to be spaced apart from each other in the parallel direction of the magnetic disks. Among the plurality of magnetic heads, the magnetic head in which the magnetic pole width in the width direction of a recording track formed in the recording layer is wider, or the magnetic head in which the region width in the width direction, which is capable of reading magnetic characteristics of a region in which magnetic recording is performed on the recording layer by the magnetic head, is wider, and an outer portion disposed at an outer position farther from the center in the parallel direction.

Description

[0001] This application enjoys the priority of the basic application based on Japanese Patent Application No. 2020-85002 (filing date: May 14, 2020). This application incorporates the entire content of the basic application by referring to this basic application. technical field [0002] Embodiments of the present invention relate to magnetic disk devices. Background technique [0003] As one means for increasing the recording capacity of a magnetic disk device, it is effective to increase the number of magnetic disks mounted in the device. However, when the mounting space is limited, in order to increase the number of disks, it is necessary to reduce the thickness of the magnetic disks and the distance between adjacent magnetic disks. Even when the thickness and spacing of the magnetic disks are reduced, for example, it is required not to increase the frequency of errors during data writing or reading due to deterioration of the positioning accuracy of the magnetic head. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/23G11B25/04
CPCG11B5/23G11B25/043G11B5/4806G11B5/3116G11B2005/0018G11B5/4813G11B5/3983G11B5/3912G11B2005/0024G11B5/012
Inventor 矶川博
Owner KK TOSHIBA
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