TW476933B - A servo format for hard disks, preferably hard disks - Google Patents

A servo format for hard disks, preferably hard disks Download PDF

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Publication number
TW476933B
TW476933B TW089108756A TW89108756A TW476933B TW 476933 B TW476933 B TW 476933B TW 089108756 A TW089108756 A TW 089108756A TW 89108756 A TW89108756 A TW 89108756A TW 476933 B TW476933 B TW 476933B
Authority
TW
Taiwan
Prior art keywords
bit sequence
magnetic disk
phase
servo
bit
Prior art date
Application number
TW089108756A
Other languages
English (en)
Chinese (zh)
Inventor
Johannes W M Bergmans
Kofi A A Makinwa
Johannes O Voorman
Original Assignee
Koninkl Philips Electronics Nv
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 Koninkl Philips Electronics Nv filed Critical Koninkl Philips Electronics Nv
Application granted granted Critical
Publication of TW476933B publication Critical patent/TW476933B/zh

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10268—Improvement or modification of read or write signals bit detection or demodulation methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1258—Formatting, e.g. arrangement of data block or words on the record carriers on discs where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
    • G11B2020/1232—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc sector, i.e. the minimal addressable physical data unit
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
    • G11B2020/1238—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1281—Servo information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1281—Servo information
    • G11B2020/1282—Servo information in embedded servo fields
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1287—Synchronisation pattern, e.g. VCO fields
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1291—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting serves a specific purpose
    • G11B2020/1298—Enhancement of the signal quality
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Digital Magnetic Recording (AREA)
TW089108756A 1999-04-20 2000-05-08 A servo format for hard disks, preferably hard disks TW476933B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99201246 1999-04-20

Publications (1)

Publication Number Publication Date
TW476933B true TW476933B (en) 2002-02-21

Family

ID=8240126

Family Applications (1)

Application Number Title Priority Date Filing Date
TW089108756A TW476933B (en) 1999-04-20 2000-05-08 A servo format for hard disks, preferably hard disks

Country Status (7)

Country Link
US (1) US6515812B1 (enExample)
EP (1) EP1090393B1 (enExample)
JP (1) JP2002542567A (enExample)
KR (1) KR100639525B1 (enExample)
DE (1) DE60030653T2 (enExample)
TW (1) TW476933B (enExample)
WO (1) WO2000063904A1 (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6833972B2 (en) * 2001-10-26 2004-12-21 Matsushita Electric Industrial Co., Ltd. Method for reproducing phase information signals in an information recording device
EP1496512A1 (en) * 2003-07-09 2005-01-12 Deutsche Thomson-Brandt Gmbh Method for adaptive bit recovery
US7342734B1 (en) * 2004-09-02 2008-03-11 Maxtor Corporation Disk drives with radially aligned servo burst patterns that generate orthogonal contributions to a read signal and related demodulators and methods
US7206146B2 (en) 2004-10-27 2007-04-17 Hitachi Global Storage Technologies Netherlands B.V. Biphase magnetic pattern detector using multiple matched filters for hard disk drive
US7502193B2 (en) * 2005-02-28 2009-03-10 Hitachi Global Storage Technologies Netherlands B.V. Positioning of a magnetic head in a magnetic data recording device using a multiple sensor array
US7349167B2 (en) * 2005-07-27 2008-03-25 Seagate Technology Llc Utilizing track identification fields for timing recovery
US7660077B2 (en) * 2006-01-10 2010-02-09 Hitachi Global Storage Technologies Netherlands B.V. Method and system for reduction of off-track write errors in disk drives
US7333290B1 (en) 2006-08-03 2008-02-19 Western Digital Technologies, Inc. Magnetic disk in a disk drive and method having improved null servo burst phasing
US7643235B2 (en) 2006-09-28 2010-01-05 Seagate Technology Llc Synchronization for data communication
US8922923B2 (en) 2011-03-01 2014-12-30 Seagate Technology Llc Interleaved automatic gain control for asymmetric data signals
US9019641B2 (en) * 2012-12-13 2015-04-28 Lsi Corporation Systems and methods for adaptive threshold pattern detection
WO2015062747A1 (en) * 2013-11-01 2015-05-07 Huawei Technologies Co.,Ltd Transmitter, receiver and method for generating synchronisation signals
US9105289B1 (en) 2014-10-15 2015-08-11 Seagate Technology Llc Integrated servo field for memory device
US12183376B1 (en) * 2023-06-16 2024-12-31 Western Digital Technologies, Inc. Data read synchronization from phase modulated synchronization fields in a data storage device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4024593A1 (de) 1990-08-02 1992-03-05 Sgs Thomson Microelectronics Verfahren und vorrichtung zur demodulation eines biphasenmodulierten signals
US5384671A (en) * 1993-12-23 1995-01-24 Quantum Corporation PRML sampled data channel synchronous servo detector
US5862005A (en) * 1994-10-11 1999-01-19 Quantum Corporation Synchronous detection of wide bi-phase coded servo information for disk drive
US5661760A (en) * 1995-10-23 1997-08-26 Quantum Corporation Wide biphase digital servo information detection, and estimation for disk drive using servo Viterbi detector
SG55370A1 (en) * 1996-09-09 1998-12-21 Texas Instruments Inc Servo demodulator and method for synchronous servo demodulation
US6049438A (en) * 1997-03-07 2000-04-11 International Business Machines Corporation Method and apparatus for encoding digital servo information in a servo burst
DE19882608T1 (de) * 1997-08-15 2000-08-24 Seagate Technology Plattenlaufwerk mit Servoinformation mit konstanter Dichte

Also Published As

Publication number Publication date
DE60030653D1 (de) 2006-10-26
KR100639525B1 (ko) 2006-10-31
EP1090393A1 (en) 2001-04-11
US6515812B1 (en) 2003-02-04
KR20010053053A (ko) 2001-06-25
EP1090393B1 (en) 2006-09-13
DE60030653T2 (de) 2007-09-06
JP2002542567A (ja) 2002-12-10
WO2000063904A1 (en) 2000-10-26

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