JP2005222684A - 書込みヘッド消磁方法および装置 - Google Patents

書込みヘッド消磁方法および装置 Download PDF

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Publication number
JP2005222684A
JP2005222684A JP2005028592A JP2005028592A JP2005222684A JP 2005222684 A JP2005222684 A JP 2005222684A JP 2005028592 A JP2005028592 A JP 2005028592A JP 2005028592 A JP2005028592 A JP 2005028592A JP 2005222684 A JP2005222684 A JP 2005222684A
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JP
Japan
Prior art keywords
current
degaussing
write
period
pulse
Prior art date
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Pending
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JP2005028592A
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English (en)
Japanese (ja)
Other versions
JP2005222684A5 (https=
Inventor
Ross S Wilson
エス．ウィルソン ロス
Carl F Elliott
エフ．エリオット カール
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agere Systems LLC
Original Assignee
Agere Systems LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agere Systems LLC filed Critical Agere Systems LLC
Publication of JP2005222684A publication Critical patent/JP2005222684A/ja
Publication of JP2005222684A5 publication Critical patent/JP2005222684A5/ja
Pending legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/465—Arrangements for demagnetisation of heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/0008—Magnetic conditionning of heads, e.g. biasing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
    • G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks

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  • Digital Magnetic Recording (AREA)
JP2005028592A 2004-02-06 2005-02-04 書込みヘッド消磁方法および装置 Pending JP2005222684A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US54256304P 2004-02-06 2004-02-06

Publications (2)

Publication Number Publication Date
JP2005222684A true JP2005222684A (ja) 2005-08-18
JP2005222684A5 JP2005222684A5 (https=) 2008-03-21

Family

ID=34998174

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005028592A Pending JP2005222684A (ja) 2004-02-06 2005-02-04 書込みヘッド消磁方法および装置

Country Status (2)

Country Link
US (1) US7411756B2 (https=)
JP (1) JP2005222684A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116206634A (zh) * 2018-08-21 2023-06-02 马维尔亚洲私人有限公司 用于磁存储介质的基于脉冲的写入

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7417817B1 (en) 2003-03-18 2008-08-26 Marvell International Ltd. Write driver circuit for magnetic data storage systems
KR100546404B1 (ko) * 2004-02-25 2006-01-26 삼성전자주식회사 하드디스크 드라이브의 데이터 기록 방법, 이에 적합한기록 장치 및 기록 매체
JP4519579B2 (ja) * 2004-08-31 2010-08-04 株式会社東芝 ディスク記憶装置
US7106536B2 (en) * 2004-09-30 2006-09-12 Agere Systems Inc. Write head demagnetizer
JP4250589B2 (ja) * 2004-12-28 2009-04-08 株式会社東芝 記録ヘッドの残留磁化消磁機能を有するヘッドアンプ回路及び同回路を備えた磁気ディスク装置
JP2006196107A (ja) * 2005-01-14 2006-07-27 Hitachi Global Storage Technologies Netherlands Bv 磁気記録装置及び記録方法
US7515371B1 (en) * 2005-05-19 2009-04-07 Maxtor Corporation Channel postamble extension to de-gauss pole tips
US20070058753A1 (en) * 2005-08-30 2007-03-15 Carlos Saavedra BPSK demodulator circuit using an anti-parallel synchronization loop
US20070153410A1 (en) * 2005-12-30 2007-07-05 Motomu Hashizume Degaussing for write head
KR100699900B1 (ko) * 2006-05-09 2007-03-28 삼성전자주식회사 자기 기록 장치의 기록 전류 최적화 결정 방법 및 이를이용한 디스크 드라이브
US7813068B2 (en) * 2008-05-14 2010-10-12 Texas Instruments Incorporated Degauss control for magnetic disk-drive preamplifier
US8503127B2 (en) 2010-11-03 2013-08-06 Texas Instruments Incorporated Method and circuitry for programmably controlling degauss write current decay in hard disk drives
US8705196B2 (en) 2012-04-16 2014-04-22 Lsi Corporation Storage device having degauss circuitry with separate control of degauss signal steady state and overshoot portions
US8773817B2 (en) * 2012-07-24 2014-07-08 Lsi Corporation Storage device having degauss circuitry with ramp generator for use in generating chirped degauss signal
US8737006B2 (en) 2012-09-07 2014-05-27 Lsi Corporation Storage device having degauss circuitry generating degauss signal with multiple decay segments
US9105276B2 (en) * 2013-02-13 2015-08-11 Avago Technologies General Ip (Singapore) Pte. Ltd. System and method for providing controllable steady state current waveshaping in a hard disk drive (HDD) preamplifier
US8873188B2 (en) * 2013-02-28 2014-10-28 Lsi Corporation Storage device having degauss circuitry configured for generating degauss signal with asymmetric decay envelopes
US9280993B2 (en) * 2013-12-12 2016-03-08 HGST Netherlands B.V. Implementing asymmetric degauss control for write head for hard disk drives
KR20160016386A (ko) * 2014-08-05 2016-02-15 에스케이하이닉스 주식회사 라이트 드라이버, 이를 포함하는 저항변화 메모리 장치 및 동작 방법
US9111561B1 (en) * 2014-10-28 2015-08-18 HGST Netherlands B.V. Magnetic recording disk drive with write current overshoot amplitude (OSA) responsive to data transitions
US9520148B1 (en) 2015-12-21 2016-12-13 Seagate Technology Llc Reset of magnetic domains in write head via external field
US10991391B1 (en) * 2020-02-04 2021-04-27 Headway Technologies, Inc. Circuits and methods for modifying the write current waveform to improve track density in HDD
JP7301800B2 (ja) * 2020-08-27 2023-07-03 株式会社東芝 磁気ディスク装置及びデータフォーマットの設定方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0264903A (ja) * 1988-08-30 1990-03-05 Toshiba Corp 磁気記録再生装置のデータ書込み回路
JPH04228103A (ja) * 1990-05-02 1992-08-18 Internatl Business Mach Corp <Ibm> 磁気記録システム
JPH07147009A (ja) * 1993-09-29 1995-06-06 Matsushita Electric Ind Co Ltd 磁気記録装置
WO2003055076A2 (en) * 2001-12-20 2003-07-03 Koninklijke Philips Electronics N.V. Analog-to-digital converter and method of generating an intermediate code for an analog-to-digital converter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4970621A (en) * 1988-09-09 1990-11-13 Hewlett-Packard Company Demagnetization of thin film magnetic recording transducers utilizing a decreasing AC current
US7088537B2 (en) * 2004-03-09 2006-08-08 Seagate Technology Llc Removing residual magnetization in a data transducer
US7106536B2 (en) * 2004-09-30 2006-09-12 Agere Systems Inc. Write head demagnetizer
US7092186B1 (en) * 2004-11-23 2006-08-15 Western Digital Technologies, Inc. Demagnetizing a head in a disk drive by increasing the frequency of an AC write signal while maintaining the write current amplitude

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0264903A (ja) * 1988-08-30 1990-03-05 Toshiba Corp 磁気記録再生装置のデータ書込み回路
JPH04228103A (ja) * 1990-05-02 1992-08-18 Internatl Business Mach Corp <Ibm> 磁気記録システム
JPH07147009A (ja) * 1993-09-29 1995-06-06 Matsushita Electric Ind Co Ltd 磁気記録装置
WO2003055076A2 (en) * 2001-12-20 2003-07-03 Koninklijke Philips Electronics N.V. Analog-to-digital converter and method of generating an intermediate code for an analog-to-digital converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116206634A (zh) * 2018-08-21 2023-06-02 马维尔亚洲私人有限公司 用于磁存储介质的基于脉冲的写入

Also Published As

Publication number Publication date
US7411756B2 (en) 2008-08-12
US20050190476A1 (en) 2005-09-01

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