WO1997012363A3 - Improved fault tolerant sync mark detector for sampled amplitude magnetic recording - Google Patents

Improved fault tolerant sync mark detector for sampled amplitude magnetic recording Download PDF

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Publication number
WO1997012363A3
WO1997012363A3 PCT/US1996/015582 US9615582W WO9712363A3 WO 1997012363 A3 WO1997012363 A3 WO 1997012363A3 US 9615582 W US9615582 W US 9615582W WO 9712363 A3 WO9712363 A3 WO 9712363A3
Authority
WO
WIPO (PCT)
Prior art keywords
sync mark
preamble field
field
preamble
data
Prior art date
Application number
PCT/US1996/015582
Other languages
French (fr)
Other versions
WO1997012363A2 (en
Inventor
Christopher P Zook
Original Assignee
Cirrus Logic Inc
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 Cirrus Logic Inc filed Critical Cirrus Logic Inc
Priority to DE69617630T priority Critical patent/DE69617630T2/en
Priority to EP96936042A priority patent/EP0793843B1/en
Priority to JP9513716A priority patent/JPH10510089A/en
Publication of WO1997012363A2 publication Critical patent/WO1997012363A2/en
Publication of WO1997012363A3 publication Critical patent/WO1997012363A3/en
Priority to HK98102007A priority patent/HK1002885A1/en

Links

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
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • 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
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • 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
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters 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
    • G11B20/14—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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • 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
    • 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
    • G11B2020/1476—Synchronisation patterns; Coping with defects thereof

Abstract

A sampled amplitude read channel reads data from a magnetic medium by detecting digital data from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over the magnetic medium. The digital data comprises a preamble field followed by a sync mark followed by a data field. Timing recovery (28) in the read channel synchronizes to a phase and frequency of the preamble field and a sync detector (A120) detects the sync mark in order to frame operation of an RLL decoder (36, A122) for decoding the detected data field. To decrease the probability of early misdetection, the sync mark is chosen to have minimum correlation with shifted versions of the sync mark concatenated with the preamble field. To further increase the fault tolerance, the sync mark detector is enabled by timing recovery relative to the end of the preamble field. A timing recovery state machine generates expected sample values used to acquire the preamble field, and a current state of the state machine indicates when the preamble ends relative to a predetermined clock interval. As a result, the search for an appropriate sync mark need only look for minimum correlation during shifts at the predetermined clock interval, thereby increasing the fault tolerant characteristic of the sync mark. In one embodiment, both the sign and magnitude of the data are used in the correlation to further increase the fault tolerance.
PCT/US1996/015582 1995-09-26 1996-09-26 Improved fault tolerant sync mark detector for sampled amplitude magnetic recording WO1997012363A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69617630T DE69617630T2 (en) 1995-09-26 1996-09-26 IMPROVED ERROR-TOLERANT SYNC BRAND DETECTOR FOR MAGNETIC RECORDING WITH AMPLITUDE SCAN
EP96936042A EP0793843B1 (en) 1995-09-26 1996-09-26 Improved fault tolerant sync mark detector for sampled amplitude magnetic recording
JP9513716A JPH10510089A (en) 1995-09-26 1996-09-26 Improved fault-tolerant synchronous mark detector for sampled amplitude magnetic recording
HK98102007A HK1002885A1 (en) 1995-09-26 1998-03-13 Improved fault tolerant sync mark detector for sampled amplitude magnetic recording

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/533,797 US5793548A (en) 1995-05-12 1995-09-26 Fault tolerant sync mark detector for comparing a sign and magnitude of a detected sequence to a target sync mark in sampled amplitude magnetic recording
US08/533,797 1995-09-26

Publications (2)

Publication Number Publication Date
WO1997012363A2 WO1997012363A2 (en) 1997-04-03
WO1997012363A3 true WO1997012363A3 (en) 1997-05-22

Family

ID=24127478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/015582 WO1997012363A2 (en) 1995-09-26 1996-09-26 Improved fault tolerant sync mark detector for sampled amplitude magnetic recording

Country Status (7)

Country Link
US (1) US5793548A (en)
EP (1) EP0793843B1 (en)
JP (4) JPH10510089A (en)
KR (1) KR100495715B1 (en)
DE (1) DE69617630T2 (en)
HK (1) HK1002885A1 (en)
WO (1) WO1997012363A2 (en)

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US6604204B1 (en) * 1999-09-30 2003-08-05 Stmicroelectronics, Inc. Circuit and method for recovering synchronization information from a signal
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US7239592B2 (en) 2000-04-03 2007-07-03 Stmicroelectronics S.A. Method for indicating a sector on a data medium and data medium suited to this method
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US6639748B1 (en) * 2001-02-28 2003-10-28 Western Digital Technologies, Inc. Disk drive that discerns the polarity of a head signal from a sync mark to enhance data detection
US6369969B1 (en) 2001-02-28 2002-04-09 Western Digital Technologies, Inc. Disk drive for detecting a polarity error of a magnetoresistive head by detecting a sync mark
US7054398B1 (en) 2001-07-18 2006-05-30 Marvell International Ltd. Method for selecting sync marks and sync mark detectors
JP3668202B2 (en) * 2002-03-13 2005-07-06 株式会社東芝 Information recording / reproducing apparatus and signal evaluation method thereof
US8861667B1 (en) * 2002-07-12 2014-10-14 Rambus Inc. Clock data recovery circuit with equalizer clock calibration
US6999534B2 (en) * 2002-07-31 2006-02-14 Texas Instruments Incorporated Method for mitigating DC offset in a sign bit correlator
JP4098660B2 (en) * 2003-04-23 2008-06-11 株式会社東芝 Disk storage device and sync mark detection method
US7440210B1 (en) 2004-06-23 2008-10-21 Western Digital Technologies, Inc. Servo writing a disk drive by writing multi-bit sync marks in spiral tracks for improved servo writing
US7596940B2 (en) * 2005-03-22 2009-10-06 Pratt & Whitney Rocketdyne, Inc. Rocket engine nozzle and method of fabricating a rocket engine nozzle using pressure brazing
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US7672071B2 (en) * 2006-06-12 2010-03-02 Broadcom Corporation Servo field preamble detector and methods for use therewith
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US8358566B1 (en) 2006-07-13 2013-01-22 Marvell International Ltd. Method and device for detecting a sync mark
KR100884003B1 (en) * 2007-01-26 2009-02-17 삼성전자주식회사 Method for preventing write fault and Hard Disk Drive thereof
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US8261171B2 (en) * 2011-01-27 2012-09-04 Lsi Corporation Systems and methods for diversity combined data detection
US8687301B1 (en) 2013-01-08 2014-04-01 Lsi Corporation Parallel no-sync-mark retry
US9111573B1 (en) * 2014-04-01 2015-08-18 Avago Technologies General Ip (Singapore) Pte. Ltd. Detection of end of preamble in read channel without interpolation
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US10164760B1 (en) 2016-10-18 2018-12-25 Seagate Technology Llc Timing excursion recovery
US10152457B1 (en) 2016-10-25 2018-12-11 Seagate Technology Llc Target parameter adaptation
US10277718B1 (en) 2016-11-22 2019-04-30 Seagate Technology Llc Preamble defect detection and mitigation
US10084553B1 (en) 2016-12-22 2018-09-25 Seagate Technology Llc Iterative recovery from baseline or timing disturbances
US9954537B1 (en) 2016-12-23 2018-04-24 Seagate Technology Llc Wide frequency range clock generation with phase interpolation
US9979573B1 (en) 2016-12-23 2018-05-22 Seagate Technology Llc Position error signal burst demodulation
US9998136B1 (en) 2017-02-17 2018-06-12 Seagate Technology Llc Loop consistency using multiple channel estimates
US10382166B1 (en) 2017-02-22 2019-08-13 Seagate Technology Llc Constrained receiver parameter optimization
US9928854B1 (en) 2017-05-03 2018-03-27 Seagate Technology Llc MISO equalization with ADC averaging

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Also Published As

Publication number Publication date
US5793548A (en) 1998-08-11
JP2009043408A (en) 2009-02-26
DE69617630T2 (en) 2002-05-08
JP4793945B2 (en) 2011-10-12
EP0793843A1 (en) 1997-09-10
WO1997012363A2 (en) 1997-04-03
JPH10510089A (en) 1998-09-29
KR980700653A (en) 1998-03-30
JP2007080514A (en) 2007-03-29
DE69617630D1 (en) 2002-01-17
KR100495715B1 (en) 2005-10-12
JP2011216182A (en) 2011-10-27
HK1002885A1 (en) 1998-09-25
EP0793843B1 (en) 2001-12-05

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