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Timing based servo system for magnetic tape systems

Info

Publication number
CA2148390A1
CA2148390A1 CA 2148390 CA2148390A CA2148390A1 CA 2148390 A1 CA2148390 A1 CA 2148390A1 CA 2148390 CA2148390 CA 2148390 CA 2148390 A CA2148390 A CA 2148390A CA 2148390 A1 CA2148390 A1 CA 2148390A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
servo
head
tape
read
pattern
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.)
Granted
Application number
CA 2148390
Other languages
French (fr)
Other versions
CA2148390C (en )
Inventor
Thomas Robert Albrecht
Robert Carl Barrett
James Howard Eaton
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.)
International Business Machines Corp
Original Assignee
Thomas Robert Albrecht
Robert Carl Barrett
James Howard Eaton
International Business Machines Corporation
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
Family has litigation

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/584Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes

Abstract

A track following servo system is disclosed for use with magnetic tape systems in which magnetic servo track patterns contain transitions recorded at more than on azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern is read by a servo read head whose width is small compared to the servo track pattern.
The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern on the tape, wear of the head or tape, or debris collection on the head or tape.
Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to tape speed during reading. The servo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple gap servo write head whose magnetic gaps have geometries appropriate to generate the desired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ring head structure.
CA 2148390 1994-06-30 1995-05-02 Timing based servo system for magnetic tape systems Expired - Lifetime CA2148390C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US270,207 1994-06-30
US08270207 US5689384A (en) 1994-06-30 1994-06-30 Timing based servo system for magnetic tape systems

Publications (2)

Publication Number Publication Date
CA2148390A1 true true CA2148390A1 (en) 1995-12-31
CA2148390C CA2148390C (en) 2004-04-27

Family

ID=23030359

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2148390 Expired - Lifetime CA2148390C (en) 1994-06-30 1995-05-02 Timing based servo system for magnetic tape systems

Country Status (7)

Country Link
US (5) US5689384A (en)
JP (5) JP3158015B2 (en)
KR (1) KR100209832B1 (en)
CN (5) CN100363985C (en)
CA (1) CA2148390C (en)
DE (2) DE69507210D1 (en)
EP (1) EP0690442B1 (en)

Families Citing this family (250)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5689384A (en) * 1994-06-30 1997-11-18 International Business Machines Corporation Timing based servo system for magnetic tape systems
JP3048878B2 (en) * 1995-03-31 2000-06-05 インターナショナル・ビジネス・マシーンズ・コーポレイション Information recording medium, a head position identification method, and information recording apparatus
US6009537A (en) * 1996-03-29 1999-12-28 Kabushiki Kaisha Toshiba Disk wear prevention by relocating data in response to a head slide count
US6067204A (en) * 1996-06-03 2000-05-23 Seagate Technology, Inc. Disc drive servo pattern insensitive to read head
US6018434A (en) * 1997-01-14 2000-01-25 Quantum Corporation Tape cartridge having written-in-defect servo patterns for rapid head position calibration
US5822285A (en) * 1997-03-31 1998-10-13 International Business Machines Corporation Atomic force microscopy disk data storage system with nonradial tracking lines
US5995315A (en) * 1997-05-09 1999-11-30 Hewlett-Packard Company Servo system for following a magnetic track having identifying pulse widths
US5880456A (en) * 1997-05-09 1999-03-09 Hewlett-Packard Company Circuit provides a normalized position signal for lateral photoeffect position sensor
US5930065A (en) * 1997-05-16 1999-07-27 International Business Machines Corporation Timing based servo longitudinal addressing
US6134070A (en) * 1997-05-22 2000-10-17 Imation Corp. Encoded servo track configurations, servo writer and systems/method regarding same
US5923272A (en) * 1997-07-08 1999-07-13 International Business Machines Corporation Serial bitstream code for timing-based servo
US6018444A (en) * 1997-10-28 2000-01-25 Hewlett-Packard Company Batch fabricated servo write head having low write-gap linewidth variation
US6031673A (en) * 1998-03-04 2000-02-29 Hewlett-Packard Company Servo band verification in linear tape systems having timing-based servo formats
EP0940812B1 (en) * 1998-03-04 2006-11-15 Hewlett-Packard Company, A Delaware Corporation Absolute longitudinal position encoding in linear tape systems
US6111719A (en) * 1998-03-06 2000-08-29 Hewlett-Packard Company Linear speed measurement independent of lateral position in linear tape systems
JPH11339254A (en) 1998-03-24 1999-12-10 Quantum Corp Magnetic recording tape, information storage medium and magnetic tape recording and reproducing system
US6222698B1 (en) 1998-05-22 2001-04-24 Hewlett-Packard Company Magnetic tape dimensional instability compensation by varying recording head azimuth angle
JP4157204B2 (en) * 1998-10-19 2008-10-01 セイコーインスツル株式会社 Information reproducing apparatus, information recording apparatus, information reproducing method and information recording method
US6122124A (en) * 1998-10-20 2000-09-19 Hewlett-Packard Co. Servo system and method with digitally controlled oscillator
US6124996A (en) * 1998-10-20 2000-09-26 Hewlett-Packard Co. Servo system and method with multiple phase clock
US6741415B1 (en) 1999-02-16 2004-05-25 Quantum Corporation Method of writing servo signal on magnetic tape
US6365061B1 (en) * 1999-02-17 2002-04-02 Imation Corp. Multibeam laser servowriting of magnetic data storage media
EP1205913A4 (en) 1999-02-17 2002-08-14 Quantum Corp Method of writing servo signal on magnetic tape
US6433951B1 (en) 1999-02-17 2002-08-13 Imation Corp. Magnetic data storage tape with etched servo pattern, method of manufacturing same, and method of servo positioning on same
US6269533B2 (en) * 1999-02-23 2001-08-07 Advanced Research Corporation Method of making a patterned magnetic recording head
US7773340B2 (en) * 1999-02-23 2010-08-10 Advanced Research Corporation Patterned magnetic recording head having a gap pattern with substantially elliptical or substantially diamond-shaped termination pattern
US7196870B2 (en) * 1999-02-23 2007-03-27 Advanced Research Corporation Patterned magnetic recording head with termination pattern having a curved portion
US20030093894A1 (en) * 1999-02-23 2003-05-22 Dugas Matthew P. Double layer patterning and technique for making a magnetic recording head
US6542325B1 (en) * 1999-03-10 2003-04-01 Imation Corp. Time-based servo for magnetic storage media
US6532128B1 (en) 1999-05-19 2003-03-11 International Business Machines Corporation Data set to recording media registration and synchronization
US6278571B1 (en) * 1999-05-19 2001-08-21 International Business Machines Corporation Adaptive servo gap detection for timing based servo
US6710956B1 (en) * 1999-06-30 2004-03-23 Housan Dakroub Preamp using pulsed write currents
US6571205B1 (en) * 1999-07-07 2003-05-27 Nortel Networks Limited Method and apparatus for transferring information between devices using a tape drive
US7029726B1 (en) * 1999-07-27 2006-04-18 Quantum Corporation Method for forming a servo pattern on a magnetic tape
US6961200B2 (en) 1999-07-27 2005-11-01 Quantum Corporation Optical servo track identification on tape storage media
US6525898B1 (en) 1999-08-03 2003-02-25 International Business Machines Corporation Detection of indexed servo positions displaced from servo track edges
US6239939B1 (en) 1999-08-09 2001-05-29 International Business Machines Corporation Robust detection of data modulated into a timing based servo
US6558774B1 (en) 1999-08-17 2003-05-06 Quantum Corporation Multiple-layer backcoating for magnetic tape
US6545836B1 (en) * 1999-11-12 2003-04-08 Acorn Technologies, Inc. Servo control apparatus and method using absolute value input signals
US6496328B1 (en) 1999-12-30 2002-12-17 Advanced Research Corporation Low inductance, ferrite sub-gap substrate structure for surface film magnetic recording heads
US6989960B2 (en) * 1999-12-30 2006-01-24 Advanced Research Corporation Wear pads for timing-based surface film servo heads
US6493174B1 (en) 2000-02-17 2002-12-10 Imation Corp. Optical servo system for use with magnetic data storage tape having magnetic reference indicators
US6574066B1 (en) 2000-02-17 2003-06-03 Imation Corp. Time-based optical servo system and method
US6865041B1 (en) * 2000-02-29 2005-03-08 Hitachi Global Storage Technologies Netherlands B.V. Method and apparatus for servowriting using a unipolar write current
US6721126B1 (en) * 2000-08-16 2004-04-13 International Business Machines Corporation Position identification for a coarse actuator portion of a compound actuator
US6580581B1 (en) * 2000-08-16 2003-06-17 International Business Machines Corporation Recovery of lateral position of a servo system with respect to longitudinal servo bands of a magnetic tape
US6639753B1 (en) * 2000-09-01 2003-10-28 Hewlett-Packard Development Company, L.P. Method of forming a head assembly, a head assembly, and a linear tape drive
US6700729B1 (en) * 2000-10-17 2004-03-02 Hewlett-Packard Development Company Alignment marks for tape head positioning
US6961203B1 (en) 2001-03-06 2005-11-01 Maxtor Corporation Hybrid printed servo patterns for magnetic media and hard disk systems implementing same
JP3861197B2 (en) * 2001-03-22 2006-12-20 株式会社東芝 The method of manufacturing a recording medium
US6771456B2 (en) 2001-05-31 2004-08-03 International Business Machines Corporation System and method for miniaturization of read/write heads
US6865050B2 (en) * 2001-06-07 2005-03-08 Fuji Photo Film Co., Ltd. Servo signal recording device and servo signal verifying device using edge detection
JP2002373411A (en) * 2001-06-15 2002-12-26 Fuji Photo Film Co Ltd Magnetic recording medium and drive apparatus thereof
US6781778B1 (en) * 2001-07-16 2004-08-24 Imation Corp. Time-based sectored servo data format
US6754022B1 (en) 2001-07-16 2004-06-22 Imation Corp. High-speed current driver
US6738210B1 (en) 2001-07-16 2004-05-18 Imation Corp. Amplitude detection for full band servo verification
US6762900B2 (en) * 2001-07-17 2004-07-13 International Business Machines Corporation Method and apparatus for performing position error signal conditioning of LTO media servo format written-in velocity variation
US7072133B1 (en) * 2001-10-15 2006-07-04 Imation Corp. Servo mark verify head
US7023650B2 (en) 2001-11-07 2006-04-04 Quantum Corporation Optical sensor to recording head alignment
JP2003157634A (en) * 2001-11-19 2003-05-30 Fuji Photo Film Co Ltd Servo signal writing system
US6873487B2 (en) * 2001-11-26 2005-03-29 Imation Corp. Hybrid servopositioning systems
JP3830088B2 (en) * 2001-11-29 2006-10-04 富士写真フイルム株式会社 Servo control method, a magnetic tape, and a magnetic tape recording and reproducing apparatus
US20030123174A1 (en) * 2001-12-28 2003-07-03 Mark Hennecken Continuously variable storage device data transfer rate
US6744594B2 (en) 2001-12-28 2004-06-01 Storage Technology Corporation Servo write head with gaps for writing high and low frequency transitions
US6710967B2 (en) * 2001-12-28 2004-03-23 Storage Technology Corporation High frequency and low frequency servo pattern
US6950269B1 (en) 2002-01-18 2005-09-27 Imation Corp. System and methods for using servopositioning signals
US6879457B2 (en) 2002-02-13 2005-04-12 International Business Machines Corporation Timing based servo with fixed distances between transitions
US6999258B2 (en) * 2002-03-01 2006-02-14 Imation Ccorp. Time-based servopositioning systems
US6735039B1 (en) 2002-03-29 2004-05-11 Imation Corp. Linear positioning encoding in amplitude-based servopositioning systems
US6934115B1 (en) 2002-04-25 2005-08-23 Storage Technology Corporation Band identification using a single C-core servo write head for timing based servo patterns
US6912104B2 (en) 2002-04-30 2005-06-28 Storage Technology Corporation Timing based servo pattern incorporating band encoding
US7130140B1 (en) * 2002-05-06 2006-10-31 Storage Technology Corporation Polarity encoded pattern for timing based servo
US6639529B1 (en) * 2002-05-14 2003-10-28 Mitutoyo Corporation System and method for delay calibration in position encoders
WO2004001724A1 (en) * 2002-06-19 2003-12-31 Advanced Research Corporation Optical waveguide path for a thermal-assisted magnetic recording head
US6865052B2 (en) * 2002-06-27 2005-03-08 International Business Machines Corporation Apparatus and method to calibrate servo sensors in a noisy environment
JP2004145949A (en) * 2002-10-23 2004-05-20 Fuji Photo Film Co Ltd Servo signal-testing device
JP2004145948A (en) 2002-10-23 2004-05-20 Fuji Photo Film Co Ltd Magnetic tape drive
US7511912B2 (en) * 2002-11-22 2009-03-31 Seagate Technology Llc Writing multiple servo sector patterns to improve servo sector alignment on multiple surfaces
JP2004185765A (en) * 2002-12-06 2004-07-02 Fuji Photo Film Co Ltd Inspection method of magnetic tape drive, and manufacturing method of inspection tape used for inspection method
US6970312B2 (en) * 2002-12-23 2005-11-29 Imation Corp. Full amplitude time-based servopositioning signals
US6934108B2 (en) * 2003-01-22 2005-08-23 International Business Machines Corporation Servo pattern based tape tension control for tape drives
US7139151B2 (en) * 2003-03-03 2006-11-21 Imation Corp. Band identification in time-based servopositioning formats
US6947247B2 (en) 2003-03-05 2005-09-20 Advanced Research Corporation Large angle azimuth recording and head configurations
JP2004318977A (en) * 2003-04-15 2004-11-11 Fuji Photo Film Co Ltd Magnetic tape and its manufacturing method, and servo writer
JP4157412B2 (en) * 2003-04-15 2008-10-01 富士フイルム株式会社 Magnetic tape, a manufacturing method thereof, a servo writer, and the servo band identification method and apparatus
JP3966512B2 (en) * 2003-04-22 2007-08-29 富士フイルム株式会社 Servo write head assembly and servo writer
US7106544B2 (en) * 2003-05-09 2006-09-12 Advanced Research Corporation Servo systems, servo heads, servo patterns for data storage especially for reading, writing, and recording in magnetic recording tape
US7035040B2 (en) * 2003-05-16 2006-04-25 Imation Corp. Sequenced time-based servo techniques
US6952317B2 (en) * 2003-06-17 2005-10-04 Imation Corp. Amplitude-based servo patterns for magnetic media
JP2005025820A (en) * 2003-06-30 2005-01-27 Fuji Photo Film Co Ltd Magnetic recording medium
EP1494215A1 (en) * 2003-06-30 2005-01-05 Fuji Photo Film Co., Ltd. Magnetic recording medium
US7259927B2 (en) * 2003-07-14 2007-08-21 Agere Systems, Inc. Method and apparatus for improving signal-to-noise ratio for hard disk drives
US6937413B2 (en) * 2003-08-08 2005-08-30 International Business Machines Corporation Tape servo information with superimposed data information providing servo band identification
US7002763B2 (en) * 2003-08-08 2006-02-21 International Business Machines Corporation Identification of laterally positioned servo bands employing differentiating characteristics of servo patterns
JP2005063623A (en) * 2003-08-20 2005-03-10 Fuji Photo Film Co Ltd Servo writer and servo writing method
JP2005078724A (en) * 2003-09-01 2005-03-24 Fuji Photo Film Co Ltd Magnetic head for magnetic tape drive
JP4095513B2 (en) * 2003-09-05 2008-06-04 富士フイルム株式会社 Servo writer and a servo writing method
JP2005085390A (en) * 2003-09-09 2005-03-31 Fuji Photo Film Co Ltd Complex type magnetic head and manufacturing method therefor
JP2005085361A (en) * 2003-09-09 2005-03-31 Fuji Photo Film Co Ltd Servo writer
JP4046284B2 (en) * 2003-09-11 2008-02-13 富士フイルム株式会社 Magnetic tape and a method for producing the same, and a method of writing servo writer and servo signals
JP2005085421A (en) * 2003-09-11 2005-03-31 Fuji Photo Film Co Ltd Magnetic tape and its manufacturing method, servo writer, and servo signal writing method
JP2005092941A (en) * 2003-09-16 2005-04-07 Fuji Photo Film Co Ltd Magnetic tape and servo writer
EP1528540A1 (en) * 2003-10-29 2005-05-04 Storage Technology Corporation Timing based servo pattern incorporating band encoding
US7038872B2 (en) * 2003-11-10 2006-05-02 Imation Corp. Servo patterns with inherent track ID
JP2005166230A (en) 2003-11-10 2005-06-23 Sony Corp Recording method for magnetic recording medium, recording device for magnetic recording medium, and magnetic recording medium
US7038871B2 (en) * 2003-11-10 2006-05-02 Imation Corp. Multi-band servo patterns with inherent track ID
US7142381B2 (en) * 2003-11-10 2006-11-28 Imation Corp. Servo writing devices for creating servo patterns with inherent track ID
JP2005166140A (en) * 2003-12-01 2005-06-23 Fuji Photo Film Co Ltd Magnetic tape cartridge, servo writer, magnetic tape drive, and servo signal reading method
JP2005166164A (en) * 2003-12-02 2005-06-23 Fuji Photo Film Co Ltd Optical tape, optical tape cartridge, optical tape drive, and method for recording data to optical tape
JP2005166163A (en) * 2003-12-02 2005-06-23 Fuji Photo Film Co Ltd Magnetic tape, magnetic tape cartridge, magnetic tape drive, and method for recording data to magnetic tape
JP2005166193A (en) * 2003-12-04 2005-06-23 Fuji Photo Film Co Ltd Composite magnetic head and manufacturing method thereof
US8144424B2 (en) 2003-12-19 2012-03-27 Dugas Matthew P Timing-based servo verify head and magnetic media made therewith
JP2005196915A (en) * 2004-01-09 2005-07-21 Fuji Photo Film Co Ltd Magnetic tape feeding device
US7283317B2 (en) * 2004-01-30 2007-10-16 Advanced Research Corporation Apparatuses and methods for pre-erasing during manufacture of magnetic tape
US7590801B1 (en) * 2004-02-12 2009-09-15 Netapp, Inc. Identifying suspect disks
US7301716B2 (en) * 2004-02-17 2007-11-27 Advanced Research Corporation Stepped time based servo pattern and head
US7511907B2 (en) 2004-02-17 2009-03-31 Advanced Research Corporation Stepped time based servo pattern and head
US20100321824A1 (en) * 2004-02-18 2010-12-23 Dugas Matthew P Magnetic recording head having secondary sub-gaps
US7800862B1 (en) 2004-02-18 2010-09-21 Advanced Research Corporation Magnetic recording head having secondary sub-gaps
US7199957B2 (en) * 2004-03-30 2007-04-03 Imation Corp. Write head alignment for full amplitude time-based servo
US7450341B2 (en) * 2004-05-04 2008-11-11 Advanced Research Corporation Intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording heads and method of making the same
JP2005327386A (en) * 2004-05-14 2005-11-24 Fuji Photo Film Co Ltd Magnetic recording medium, servo signal write head unit, and servo writer
JP2005327392A (en) * 2004-05-14 2005-11-24 Fuji Photo Film Co Ltd Tape drive
US7206170B2 (en) 2004-05-19 2007-04-17 Imetion Corp. Thin film servo head apparatus with canted servo gaps
US7158338B2 (en) * 2004-05-24 2007-01-02 Quantum Corporation Servo track having periodic frames of tone field and embedded synchronization marks
US7095583B2 (en) * 2004-06-02 2006-08-22 Imation Corp. Dual mode servo pattern
US6956709B1 (en) * 2004-06-07 2005-10-18 Storage Technology Corporation Write velocity identification in a PRML system
US7092200B2 (en) * 2004-06-25 2006-08-15 Fuji Photo Film Co., Ltd. Magnetic tape drive with recording head group providing high density data signal recording
US7016143B2 (en) * 2004-07-07 2006-03-21 International Business Machines Corporation Utilization of tape head electronic lapping guides (ELG's) as servo format verifiers
US7196859B2 (en) * 2004-07-09 2007-03-27 Imation Corp. Processing techniques for time-based servo patterns
US7405907B2 (en) * 2004-08-03 2008-07-29 O-Mass As Adjacent magnetoresistive read head and method for obtaining position error signal
US7269687B2 (en) * 2004-08-20 2007-09-11 Quantum Corporation Bounding defective regions of a tape storage medium
JP2006059461A (en) * 2004-08-20 2006-03-02 Fuji Photo Film Co Ltd Servo writer
US7199958B2 (en) * 2004-08-25 2007-04-03 Imation Corp. Servo head with varying write gap width
US7394618B2 (en) * 2004-09-10 2008-07-01 International Business Machines Corporation System and method for cleaning a tape drive
JP2006092586A (en) * 2004-09-21 2006-04-06 Fuji Photo Film Co Ltd Servo signal inspection apparatus and servo signal inspection method
JP4095600B2 (en) 2004-09-27 2008-06-04 富士フイルム株式会社 Magnetic tape running device
US7280294B2 (en) * 2004-11-30 2007-10-09 International Business Machines Corporation Tri-state servowriter driver with slow return to zero
US7110212B2 (en) * 2004-12-15 2006-09-19 International Business Machines Corporation Compensator for a synchronous sampling time-base servo system
US7265935B2 (en) * 2004-12-15 2007-09-04 International Business Machines Corporation Velocity adaptive compensator for a synchronous sampling time-based servo system
US7119976B2 (en) * 2005-01-12 2006-10-10 International Business Machines Corporation Planar servo format verifier head
JP2006196065A (en) * 2005-01-12 2006-07-27 Fuji Photo Film Co Ltd Servo writer
JP4287827B2 (en) * 2005-02-18 2009-07-01 富士フイルム株式会社 Servo track inspection apparatus and a servo writer
US7466510B2 (en) * 2005-06-03 2008-12-16 Imation Corp. Distributed servo patterns for data storage media
US7230783B2 (en) * 2005-06-16 2007-06-12 International Business Machines Corporation Mitigation of MR read head distortion
US7379254B2 (en) * 2005-06-29 2008-05-27 Imation Corp. Mixed frequency amplitude-based servo pattern
US7362525B2 (en) * 2005-07-22 2008-04-22 Quantum Corporation PRML based magnetic servo position demodulator
US20070047122A1 (en) * 2005-08-30 2007-03-01 International Business Machines Corporation Tape head having write devices and narrower read devices
US7760465B2 (en) * 2005-10-25 2010-07-20 International Business Machines Corporation Magnetic head having selectively defined reader gap thicknesses
US7474486B2 (en) * 2005-11-18 2009-01-06 International Business Machines Corporation Magnetic storage media
US7679858B2 (en) * 2005-11-18 2010-03-16 International Business Machines Corporation Method for differential timing based servo pattern for magnetic-based storage media
US7511908B2 (en) * 2005-11-18 2009-03-31 International Business Machines Corporation Magnetic-polarity encoded servo position information for magnetic-based storage media
US7369342B2 (en) 2005-11-22 2008-05-06 International Business Machines Corporation Peak detection for magnetic tape timing based servo
US7428118B2 (en) * 2005-11-28 2008-09-23 Quantum Corporation LTM compensation methods and systems for magnetic servo writing
US7365929B2 (en) * 2006-07-30 2008-04-29 International Business Machines Corporation Synchronous servo channel for tape drive systems
US7436622B2 (en) * 2006-07-31 2008-10-14 Imation Corp. Concurrent servo and data track writing
US7791834B2 (en) * 2006-08-14 2010-09-07 International Business Machines Corporation Magnetic head having a ratio of back gap width to front gap width in about a defined range
US7535668B2 (en) * 2006-08-28 2009-05-19 International Business Machines Corporation Modulated timing based servo pattern strings for magnetic-based storage media
US7388728B1 (en) * 2006-09-22 2008-06-17 Western Digital Technologies, Inc. System and method for writing servo sectors in a perpendicular media recording environment
US7466509B1 (en) 2006-09-22 2008-12-16 Western Digital Technologies, Inc. Disk drive operable with first and second servo patterns in a perpendicular media recording environment
JP4163729B2 (en) * 2006-10-03 2008-10-08 株式会社東芝 Magnetic recording medium, a method of manufacturing the same, and magnetic recording apparatus
US20080144211A1 (en) * 2006-12-18 2008-06-19 Weber Mark P Servo techniques that mitigate an effect of read and write velocity variations on position error signal calculations
US7489465B2 (en) * 2007-01-18 2009-02-10 International Business Machines Corporation Apparatus, system, and method for timing based servo tape formating
JP4137987B1 (en) * 2007-01-25 2008-08-20 日立マクセル株式会社 Servo signal recording apparatus, a servo signal recording method, and a magnetic tape
JP5016446B2 (en) 2007-01-29 2012-09-05 日立マクセル株式会社 A servo signal recording method, a servo signal recording apparatus, and a magnetic recording medium
US20080186610A1 (en) * 2007-02-02 2008-08-07 Nhan Xuan Bui Apparatus, system, and method for an "m" servo pattern
JP4139428B1 (en) * 2007-02-06 2008-08-27 日立マクセル株式会社 Head tracking servo method, recording and reproducing apparatus, a magnetic tape, and a magnetic tape cartridge
US7502197B1 (en) 2007-02-06 2009-03-10 Western Digital Technologies, Inc. Disk drive demodulating a time-based servo pattern
US7495859B2 (en) * 2007-02-20 2009-02-24 Imation Corp. Interleaved servo pattern
US7477474B2 (en) 2007-03-28 2009-01-13 Quantum Corporation Servo writing and decoding position error signal for linear tape drives
US7652839B2 (en) 2007-04-26 2010-01-26 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk with identical servo patterns formed on each disk surface by single master template and disk drive using the disk
JP4918407B2 (en) * 2007-05-21 2012-04-18 日立マクセル株式会社 Servo signal recording apparatus
JP2008299902A (en) * 2007-05-29 2008-12-11 Hitachi Maxell Ltd Data recording device, and data recording method
US7466506B1 (en) 2007-06-19 2008-12-16 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk drive with head positioning servo control system for disk surfaces with identical servo patterns
US20090040643A1 (en) * 2007-07-19 2009-02-12 Quantum Corporation Method and apparatus for writing timing based servo tracks on magnetic tape using complementary servo writer pairs
US7773333B2 (en) * 2007-08-10 2010-08-10 International Business Machines Corporation Recording data simultaneously at two depths of a tilted magnetic medium
US7551380B2 (en) * 2007-09-26 2009-06-23 Sun Microsystems, Inc. Method for writing a servo pattern in tape
US8089716B2 (en) * 2007-12-19 2012-01-03 Sony Corporation Magnetic tape, magnetic tape apparatus, servo pattern recording apparatus, magnetic tape producing method, and magnetic tape recording method
WO2009094516A1 (en) * 2008-01-23 2009-07-30 Advanced Research Corporation Recording heads with embedded tape guides and magnetic media made by such recording heads
US7903368B2 (en) * 2008-02-01 2011-03-08 International Business Machines Corporation Tape cartridge having tape media with longitudinally shifted servo pattern for increased sampling rate
US7529061B2 (en) * 2008-02-01 2009-05-05 International Business Machines Corporation Tape drive for maintaining lateral position utilizing longitudinally shifted servo pattern with increased sampling rate
US7920356B2 (en) * 2008-02-01 2011-04-05 International Business Machines Corporation Method and system for providing a longitudinally shifted servo pattern for increased sampling rate
US7724466B2 (en) * 2008-02-25 2010-05-25 International Business Machines Corporation Method and system for servo stripe width detection and compensation
US7852599B2 (en) * 2008-02-25 2010-12-14 International Business Machines Corporation Apparatus, system, and method for tape drive head
US7684141B2 (en) * 2008-02-29 2010-03-23 International Business Machines Corporation Determining a reel motor angle using an estimated interval to degrees translation factor
US7684140B2 (en) * 2008-02-29 2010-03-23 International Business Machines Corporation Determining angular position of a tape reel using timing based servo format
WO2009121073A1 (en) 2008-03-28 2009-10-01 Advanced Research Corporation Thin film planar arbitrary gap pattern magnetic head
US7864487B2 (en) * 2008-05-09 2011-01-04 International Business Machines Corporation Head design for writing servo patterns on magnetic tape
US7881008B2 (en) * 2008-05-09 2011-02-01 International Business Machines Corporation Joint specification of servo format and servo reader parameters for tape drive systems
JP5207833B2 (en) * 2008-06-02 2013-06-12 日立マクセル株式会社 Servo signal recording apparatus, a magnetic tape device, and a tracking servo method
US7961423B2 (en) * 2008-06-12 2011-06-14 Hitachi Maxell, Ltd. Information recording apparatus
JP4950134B2 (en) * 2008-06-12 2012-06-13 日立マクセル株式会社 Magnetic tape unit
US8310784B2 (en) * 2008-06-18 2012-11-13 International Business Machines Corporation Tandem magnetic writer with independently addressable coils
US8913340B2 (en) * 2008-06-18 2014-12-16 International Business Machines Corporation Systems and methods for writing servo patterns
US20100177437A1 (en) * 2008-08-11 2010-07-15 Gregory Lawrence Wagner Method for Bipolar Trailing Edge Timing-Based Servo Track Recording and Magnetic Tape Made Therewith
US7746594B1 (en) 2008-09-29 2010-06-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo burst sets offset radially
US7916416B1 (en) 2008-09-29 2011-03-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo bursts having a varying tilt angle
US7746595B1 (en) 2008-09-29 2010-06-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo bursts having reverse polarity segments
WO2010044785A1 (en) * 2008-10-15 2010-04-22 Hewlett-Packard Development Company, L.P. Locating a head element of a tape storage device using servo information in a data track
US7898763B2 (en) * 2009-01-13 2011-03-01 International Business Machines Corporation Servo pattern architecture to uncouple position error determination from linear position information
US7986485B2 (en) * 2009-03-31 2011-07-26 Oracle America, Inc. Servo writer providing a pre-writing, longitudinal magnetic bias in a magnetically unoriented tape supply
US8767331B2 (en) 2009-07-31 2014-07-01 Advanced Research Corporation Erase drive system and methods of erasure for tape data cartridge
US8094407B2 (en) * 2009-08-18 2012-01-10 International Business Machines Corporation Servomechanism with adjustable predictor filter
US9034660B2 (en) * 2009-09-28 2015-05-19 International Business Machines Corporation Detection of analytes via nanoparticle-labeled substances with electromagnetic read-write heads
US8213105B2 (en) * 2009-11-05 2012-07-03 International Business Machines Corporation Cancellation of time-varying periodic disturbances in servo control systems
US8054568B2 (en) 2010-02-24 2011-11-08 International Business Machines Corporation Synchronization of symmetric timing based servo bursts
US8139312B2 (en) 2010-03-02 2012-03-20 International Business Machines Corporation Timing alternative intervals within a timing based servo band
JP4930617B2 (en) * 2010-03-26 2012-05-16 ソニー株式会社 Magnetic tape unit
JP5259645B2 (en) 2010-04-14 2013-08-07 株式会社東芝 The magnetic recording medium and a manufacturing method thereof
US8665552B2 (en) 2010-07-12 2014-03-04 Hewlett-Packard Development Company, L.P. Controlling positions of storage media heads
JP5658512B2 (en) * 2010-08-31 2015-01-28 富士フイルム株式会社 Production method and a servo writer of the magnetic tape servo signal is written
US20150049401A1 (en) * 2010-12-09 2015-02-19 Matthew P. Dugas Perpendicular timing-based servo heads
US9304130B2 (en) 2010-12-16 2016-04-05 International Business Machines Corporation Trenched sample assembly for detection of analytes with electromagnetic read-write heads
US8855957B2 (en) 2011-05-03 2014-10-07 International Business Machines Corporation Method for calibrating read sensors of electromagnetic read-write heads
US9040311B2 (en) 2011-05-03 2015-05-26 International Business Machines Corporation Calibration assembly for aide in detection of analytes with electromagnetic read-write heads
US9229071B2 (en) 2011-06-01 2016-01-05 International Business Machines Corporation Identification of molecules based on frequency responses using electromagnetic write-heads and magneto-resistive sensors
US8767342B2 (en) 2011-06-13 2014-07-01 Imation Corp. Erasure and servowriting of magnetic storage media having perpendicular anistropy
US8797674B2 (en) * 2011-06-13 2014-08-05 Imation Corp. Servo mark length matched to write head gap for magnetic storage media
US8804276B2 (en) 2011-06-13 2014-08-12 Imation Corp. Continuous biasing and servowriting of magnetic storage media having perpendicular anisotropy
US8817415B2 (en) 2011-06-13 2014-08-26 Imation Corp. Erasure of magnetic storage media having perpendicular anisotropy
WO2013046067A1 (en) * 2011-09-29 2013-04-04 International Business Machines Corporation Servo control
US8711512B2 (en) * 2011-10-24 2014-04-29 International Business Machines Corporation Servo write assembly
WO2013151612A1 (en) 2012-04-04 2013-10-10 Imation Corp. Perpendicular pole head for servo writing magnetic media
US8760802B2 (en) 2012-04-26 2014-06-24 Imation Corp. Systems and methods for processing magnetic media with first and second magnetic gaps adjacent opposite sides of the recording layer
US8867167B2 (en) 2012-04-26 2014-10-21 Imation Corp. Tapered pole heads for magnetic media
US8643968B2 (en) 2012-04-26 2014-02-04 Imation Corp. Methods and systems for magnetic media servo writing
US8797681B2 (en) 2012-04-26 2014-08-05 Imation Corp. Servo write head having plural spaced front blocks coupled by magnetic posts to a back bar
GB201209674D0 (en) 2012-05-31 2012-07-18 Ibm Write head and apparatus
GB201211469D0 (en) 2012-06-28 2012-08-08 Ibm Tape head system and method for operating a tape head system
GB201213405D0 (en) 2012-07-27 2012-09-12 Ibm Transport system for transporting magnetic tape
GB201213406D0 (en) 2012-07-27 2012-09-12 Ibm Transport system for transporting magnetic tape
US9435800B2 (en) 2012-09-14 2016-09-06 International Business Machines Corporation Sample assembly with an electromagnetic field to accelerate the bonding of target antigens and nanoparticles
JP2014059932A (en) 2012-09-19 2014-04-03 Toshiba Corp Magnetic disk device, and demodulation position correction method
US20140139944A1 (en) * 2012-11-16 2014-05-22 Imation Corp. Information storage using servo patterns
GB2508389A (en) * 2012-11-30 2014-06-04 Ibm Tape servo band with three different pseudo noise sequences
US9378764B2 (en) * 2013-03-13 2016-06-28 Oracle International Corporation Method and device for verifying a servo pattern in tape media
US8848303B1 (en) 2013-05-13 2014-09-30 Kabushiki Kaisha Toshiba Disk storage apparatus and method for servo demodulation
US8773795B1 (en) 2013-06-20 2014-07-08 International Business Machines Corporation Products with tape formats having one or more spare areas and apparatuses configured for use with such products
US8908303B1 (en) 2013-07-30 2014-12-09 Kabushiki Kaisha Toshiba Method for servo demodulation and disk storage apparatus
US9183851B2 (en) 2013-10-09 2015-11-10 Globalgoundries U.S. 2 Llc Locating data stored on a magnetic medium
CN104658555A (en) 2013-11-25 2015-05-27 株式会社东芝 Head position demodulation method and magnetic disk device
US9013826B1 (en) 2013-12-18 2015-04-21 International Business Machines Corporation Tape dimension compensation
US8896959B1 (en) * 2014-02-18 2014-11-25 Kabushiki Kaisha Toshiba Magnetic disk apparatus and data recording method
US9171563B1 (en) 2014-09-30 2015-10-27 International Business Machines Corporation Recording medium having independent track for velocity, timing and/or longitudinal position
JP2017117505A (en) 2015-12-25 2017-06-29 富士フイルム株式会社 Magnetic tape and magnetic tape unit
US9741367B1 (en) 2016-02-11 2017-08-22 International Business Machines Corporation Fabrication of a tape head with a monobloc closure
US9837107B2 (en) 2016-02-12 2017-12-05 International Business Machines Corporation Tape head with electrically conducting surface to reduce triboelectric charging
JP2017174475A (en) 2016-03-22 2017-09-28 富士フイルム株式会社 Magnetic tape and magnetic tape apparatus
US9691414B1 (en) 2016-07-01 2017-06-27 International Business Machines Corporation Tape head with narrow skiving edges fitted to transducers
US9877042B1 (en) * 2017-05-26 2018-01-23 Mitutoyo Corporation Position encoder sample timing system

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427606A (en) * 1966-03-02 1969-02-11 Ibm Memory system
US3686649A (en) * 1970-11-18 1972-08-22 Burroughs Corp Magnetic positioning mechanism with trapezoidal head
US3869711A (en) 1973-09-24 1975-03-04 Ibm Magnetic pattern recording
US4007493A (en) * 1975-05-06 1977-02-08 Burroughs Corporation Track positioning system for magnetic transducer head
GB1474892A (en) * 1975-06-27 1977-05-25 Burroughs Corp Method and apparatus for recording and reproducing information on a plural-track record disc
US4166282A (en) * 1977-06-16 1979-08-28 Burroughs Corporation Track-on-data technique and associated system involving di-bit recording and associated di-gap transducers
US4314290A (en) * 1977-06-16 1982-02-02 Burroughs Corporation Di-bit recording technique and associated servo indicia
US4209810A (en) * 1977-06-16 1980-06-24 Burroughs Corporation Di-gap, variable-frequency recording technique and associated system
DE2928311A1 (en) * 1979-07-13 1981-02-05 Basf Ag Tracking control for a system for recording / reproduction of information on a magnetaufzeichnungstraeger, in particular a flexible magnetaufzeichnungstraeger
JPS6343807B2 (en) * 1980-01-18 1988-09-01 Olympus Optical Co
US4549232A (en) * 1983-06-27 1985-10-22 International Business Machines Corporation Phase modulated servo system
JPH0685204B2 (en) * 1985-05-13 1994-10-26 株式会社日立製作所 Magnetic storage device
US4598327A (en) * 1985-06-28 1986-07-01 International Business Machines Corporation Servo control system using servo pattern time of flight for read/write head positioning in a magnetic recording system
US5003412A (en) * 1987-10-30 1991-03-26 Brier Technology, Inc. Method and apparatus for positioning a read/write mechanism
US4977471A (en) * 1987-12-07 1990-12-11 Fujitsu America, Inc. Method for servo formatting disc media for a floppy disk drive
US4933786A (en) * 1988-09-21 1990-06-12 Maxtor Corporation Fault tolerant index patterns and decoding means
US5055951A (en) * 1989-03-10 1991-10-08 Irwin Magnetic Systems, Inc. Method and apparatus for servo-positioning movable transducer heads
US5132861A (en) * 1989-10-02 1992-07-21 Behr Michael I Systems using superimposed, orthogonal buried servo signals
EP0562093A1 (en) * 1991-10-10 1993-09-29 Eastman Kodak Company Tracking control apparatus including a servo head having a tapered transducing gap
US5455729A (en) * 1993-08-30 1995-10-03 Conner Peripherals, Inc. Multi-channel rotating transformer
US5585978A (en) * 1993-08-30 1996-12-17 Conner Peripherals, Inc. Arcuate scan tape drive
US5523539A (en) * 1993-11-12 1996-06-04 Conner Peripherals, Inc. Process for manufacturing recording heads for magnetic storage devices
US5689384A (en) * 1994-06-30 1997-11-18 International Business Machines Corporation Timing based servo system for magnetic tape systems

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