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Method and apparatus for degaussing write head in a disk drive

A magnetic disk drive and writing head technology, applied to the demagnetization device of the magnetic head, the recording of information on the magnetic disk, the method of recording/reproducing/deleting, etc., can solve the problems that cannot be sufficiently suppressed

Inactive Publication Date: 2005-11-02
KK TOSHIBA
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AI Technical Summary

Problems solved by technology

[0007] In the logarithmic function shape of the degaussing current waveform, due to the characteristics of the write head used in the perpendicular magnetic recording type disk drive, even if the EAW phenomenon corresponds to the phenomenon A, sometimes a sufficient suppression effect cannot be obtained

Method used

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  • Method and apparatus for degaussing write head in a disk drive
  • Method and apparatus for degaussing write head in a disk drive
  • Method and apparatus for degaussing write head in a disk drive

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Embodiment Construction

[0019] An embodiment of the present invention will be described below with reference to the accompanying drawings.

[0020] figure 1 is a block diagram showing a main part of a perpendicular magnetic recording type disk drive according to an embodiment of the present invention.

[0021] figure 2 is a block diagram showing the main part of the head amplifier according to this embodiment.

[0022] (specific configuration of the disk drive)

[0023] The magnetic disk drive according to the present embodiment includes a magnetic disk 1 in which data is recorded in perpendicular magnetic recording, a magnetic head 2, a head amplifier 3, a read / write (R / W) channel 4, a disk controller (HDC) 5, and a buffer memory ( SDRAM)6.

[0024] The magnetic head 2 includes a write head capable of performing perpendicular magnetic recording on the magnetic disk 1 and a read head capable of reading recorded data from the magnetic disk 1 . The magnetic head 2 is configured to be held by a dr...

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Abstract

A disk drive which includes a head amplifier having a function of degaussing a magnetic head effective to suppression of an EAW phenomenon is disclosed. The head amplifier includes a degaussing controller which performs switching from write operation to degaussing operation, a write driver which outputs degaussing current necessary for the degaussing operation, and a current control unit which sets a current waveform of the degaussing current.

Description

field of invention [0001] The invention relates to a perpendicular magnetic recording disk drive, in particular to a head degaussing technology for degaussing a write head. Background technique [0002] In general, in a perpendicular magnetic recording type magnetic disk drive, an erase-after-write (EAW) phenomenon due to residual magnetization in a write head occurs when a write operation (perpendicular magnetic recording) ends. The EAW phenomenon is a phenomenon in which data recorded on a magnetic disk medium (hereinafter referred to as a magnetic disk) is erased. [0003] When the EAW phenomenon occurs, after the recording of a data sector on the magnetic disk is completed by the write head, all or some pieces of data in some data sectors recorded after the data sector are erased. If the next data sector is an access target data sector, a read error occurs when data recorded in the next data sector is read by the read head. If the next da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/09G11B5/012G11B5/02G11B5/03G11B5/465
CPCG11B5/465G11B5/02
Inventor 赤松学下村和人酒井裕儿
Owner KK TOSHIBA
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