JP2005222684A5 - - Google Patents

Download PDF

Info

Publication number
JP2005222684A5
JP2005222684A5 JP2005028592A JP2005028592A JP2005222684A5 JP 2005222684 A5 JP2005222684 A5 JP 2005222684A5 JP 2005028592 A JP2005028592 A JP 2005028592A JP 2005028592 A JP2005028592 A JP 2005028592A JP 2005222684 A5 JP2005222684 A5 JP 2005222684A5
Authority
JP
Japan
Prior art keywords
control signal
degaussing
pulse
response
current
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2005028592A
Other languages
English (en)
Japanese (ja)
Other versions
JP2005222684A (ja
Filing date
Publication date
Application filed filed Critical
Publication of JP2005222684A publication Critical patent/JP2005222684A/ja
Publication of JP2005222684A5 publication Critical patent/JP2005222684A5/ja
Pending legal-status Critical Current

Links

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 JP2005222684A (ja) 2005-08-18
JP2005222684A5 true 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=)

Families Citing this family (24)

* 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
US10734016B2 (en) * 2018-08-21 2020-08-04 Marvell Asia Pte, Ltd. Pulse-based writing for magnetic storage media
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

Family Cites Families (8)

* 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
US4970621A (en) * 1988-09-09 1990-11-13 Hewlett-Packard Company Demagnetization of thin film magnetic recording transducers utilizing a decreasing AC current
US5168395A (en) * 1990-05-02 1992-12-01 International Business Machines Corporation Controlled magnetic recording head relaxation in a magnetic recording system
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
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

Similar Documents

Publication Publication Date Title
JP2005222684A5 (https=)
US4456905A (en) Method and apparatus for encoding binary data
JP2722585B2 (ja) 誘導性負荷の駆動回路
US10095263B1 (en) Apparatus and method for calibrating signal synchronization
KR920002576B1 (ko) 데이타 기록시스템에서의 어드레스 마크발생방법 및 그 장치
JP2008306234A (ja) パルス幅変調回路、パルス幅変調方法、パラメトリックスピーカ、及びパルス幅変調制御プログラム
JPH11219524A (ja) レーザ駆動装置およびこれを用いた光ディスク記録装置
US20130154730A1 (en) Using a new synchronization scheme for a multi-channel class-d amplifier
RU2004136513A (ru) Способ формирования команд управления на ракете, вращающейся по углу крена, система управления ракетой, способ формирования линеаризированного сигнала и линеаризатор сигнала для его осуществления
JP3068027B2 (ja) 記録信号補正方法及びディスク装置
US6950118B2 (en) Laser imaging device including a pulse width modulator system
JP3826813B2 (ja) ディジタル信号処理装置及びディジタル信号処理方法
JPH0981937A (ja) 光ディスク記録装置
JPH09190615A (ja) 磁気ディスク装置のヘッド消磁方法とその回路
JP3144107B2 (ja) 記録再生制御信号の伝送方法及び記録再生制御装置
KR19980024420A (ko) 데이타 전송 장치 및 데이타 전송 방법
SU1525732A1 (ru) Устройство дл воспроизведени цифровой информации с носител магнитной записи
SU838715A1 (ru) Устройство дл записи и воспроизве-дЕНи цифРОВОй иНфОРМАции
KR101252566B1 (ko) 디지털 기반 조명의 색상 시퀀스 재생시 색상 간 변화를 제어하기 위한 조명제어 방법, 그리고 디지털 기반 조명의 색상 시퀀스 재생시 색상 간 변화를 제어하기 위한 조명제어 프로그램을 기록한 컴퓨터로 판독가능한 기록매체
JPS62172508A (ja) デイジタル磁気記録装置
SU957260A2 (ru) Устройство цифровой магнитной записи
JP2702276B2 (ja) フロッピーディスク装置のリニアパルスモータ駆動回路
SU1674230A1 (ru) Способ магнитной записи-воспроизведени цифровой информации и устройство дл его осуществлени
JPH084230B2 (ja) １−７変調データ生成装置
JP2637383B2 (ja) ブレーキ解除信号発生装置