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Magnetic disk degaussing device and degaussing method

A degaussing method and magnetic disk technology, applied in erasing methods, recording/reproducing/deleting methods, magnetic recording, etc., can solve problems such as increased bit error rates in data areas

Inactive Publication Date: 2007-10-31
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] An increase in the bit error rate in the data area due to the leakage field generated by the residual magnetism of the magnetic disk is a problem in magnetic recording

Method used

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  • Magnetic disk degaussing device and degaussing method
  • Magnetic disk degaussing device and degaussing method
  • Magnetic disk degaussing device and degaussing method

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Embodiment Construction

[0028] Preferred embodiments of the present invention will be described. In the following specification and drawings, appropriate omissions and simplifications are made to make the description clearer. In the drawings, the same components are denoted by the same reference characters, and their repeated descriptions are omitted when necessary to avoid repetition.

[0029] FIG. 1 is a perspective view of a degaussing apparatus 100 in a first embodiment according to the present invention. A degaussing apparatus 100 is provided, in its central portion, having a disk holding unit 101 covered with a door 102 . The door 102 is opened, an unshown magnetic disk is put into the disk holding unit 101, the door 102 is closed, and then, the degaussing apparatus 100 is operated. The disk holding unit 102 is formed in a size sufficient to hold twenty-five disks.

[0030] FIG. 2 is a block diagram of a control system for controlling the degaussing device 100 in the first embodiment. The m...

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Abstract

Embodiments in accordance with the present invention provide a degaussing device and a degaussing method capable of efficiently degaussing a magnetic disk, especially, a magnetic disk of the perpendicular magnetic recording system, without resorting to a magnetic field of a high intensity. Embodiments in accordance with the present invention provide a degaussing method of degaussing a magnetic disk not yet installed in a magnetic disk drive by applying an external magnetic field to the magnetic disk by a degaussing device. In accordance with one embodiment, the method includes disposing the magnetic disk in the degaussing device such that the direction of an external magnetic field is inclined at an angle to the axis of easy magnetization of the magnetic disk.

Description

technical field [0001] The present invention relates to a degaussing device and a degaussing method for removing residual magnetism from a magnetic disk. Background technique [0002] An increase in the bit error rate in the data area due to a leakage field generated by the residual magnetism of the magnetic disk is a problem in magnetic recording. In a perpendicular magnetic recording system, particularly, remanence has a significant influence on a magnetic head, and therefore, the above-mentioned problem is important. The problems caused by remanence become more important with the increasing demands on perpendicular magnetic recording systems. [0003] For example, by the ac degaussing method, the remanence of the magnetic disks of the in-plane magnetic recording system and the perpendicular magnetic recording system is removed. When the ac degaussing method is applied to degaussing a magnetic disk such as an in-plane magnetic recording system, the direction of the magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/024G11B5/667
CPCG11B5/0245
Inventor 田村仁森裕树北村充峰邦彦滨口雄彦
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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