IT8567122A1 - Apparecchiatura per registrare e leggere informazioni su un disco magnetico. - Google Patents

Apparecchiatura per registrare e leggere informazioni su un disco magnetico.

Info

Publication number
IT8567122A1
IT8567122A1 IT1985A67122A IT6712285A IT8567122A1 IT 8567122 A1 IT8567122 A1 IT 8567122A1 IT 1985A67122 A IT1985A67122 A IT 1985A67122A IT 6712285 A IT6712285 A IT 6712285A IT 8567122 A1 IT8567122 A1 IT 8567122A1
Authority
IT
Italy
Prior art keywords
recording
equipment
magnetic disk
reading information
reading
Prior art date
Application number
IT1985A67122A
Other languages
English (en)
Other versions
IT8567122A0 (it
IT1182420B (it
Original Assignee
C Olivetti & C S P A
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 C Olivetti & C S P A filed Critical C Olivetti & C S P A
Priority to IT67122/85A priority Critical patent/IT1182420B/it
Publication of IT8567122A0 publication Critical patent/IT8567122A0/it
Priority to EP85309472A priority patent/EP0191247B1/en
Priority to DE8585309472T priority patent/DE3581925D1/de
Priority to JP61025667A priority patent/JPS61198477A/ja
Priority to US06/827,370 priority patent/US4775902A/en
Publication of IT8567122A1 publication Critical patent/IT8567122A1/it
Application granted granted Critical
Publication of IT1182420B publication Critical patent/IT1182420B/it

Links

Classifications

    • 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
    • G11B5/48—Disposition 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
    • G11B5/54—Disposition 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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • 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
    • G11B5/48—Disposition 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
    • G11B5/54—Disposition 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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • 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
    • G11B5/48—Disposition 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
    • G11B5/54—Disposition 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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G11B5/553—Details
    • G11B5/5547—"Seek" control and circuits therefor
    • 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
    • G11B5/48—Disposition 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
    • G11B5/58—Disposition 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
    • G11B5/596—Disposition 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 disks
    • G11B5/59633—Servo formatting
    • G11B5/59655—Sector, sample or burst servo format
IT67122/85A 1985-02-08 1985-02-08 Apparecchiatura per registrare e leggere informazioni su un disco magnetico IT1182420B (it)

Priority Applications (5)

Application Number Priority Date Filing Date Title
IT67122/85A IT1182420B (it) 1985-02-08 1985-02-08 Apparecchiatura per registrare e leggere informazioni su un disco magnetico
EP85309472A EP0191247B1 (en) 1985-02-08 1985-12-24 Apparatus for recording and reading information on a magnetic disk
DE8585309472T DE3581925D1 (de) 1985-02-08 1985-12-24 Geraet zur aufzeichnung und wiedergabe von informationen auf einer magnetplatte.
JP61025667A JPS61198477A (ja) 1985-02-08 1986-02-07 磁気デイスク用記録／読み出し装置
US06/827,370 US4775902A (en) 1985-02-08 1986-02-10 Apparatus for recording and reading information on a magnetic disk with track following circuitry

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67122/85A IT1182420B (it) 1985-02-08 1985-02-08 Apparecchiatura per registrare e leggere informazioni su un disco magnetico

Publications (3)

Publication Number Publication Date
IT8567122A0 IT8567122A0 (it) 1985-02-08
IT8567122A1 true IT8567122A1 (it) 1986-08-08
IT1182420B IT1182420B (it) 1987-10-05

Family

ID=11299772

Family Applications (1)

Application Number Title Priority Date Filing Date
IT67122/85A IT1182420B (it) 1985-02-08 1985-02-08 Apparecchiatura per registrare e leggere informazioni su un disco magnetico

Country Status (5)

Country Link
US (1) US4775902A (it)
EP (1) EP0191247B1 (it)
JP (1) JPS61198477A (it)
DE (1) DE3581925D1 (it)
IT (1) IT1182420B (it)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992893A (en) * 1986-02-19 1991-02-12 Hitachi, Ltd. Alignment disk for magnetic disk driving apparatus and method and apparatus for verifying tracking error of the magnetic disk driving apparatus
US4954906A (en) * 1986-03-04 1990-09-04 Seiko Epson Corporation Position control system for a magnetic storage device using a small sized disk
US4775903A (en) * 1986-10-14 1988-10-04 Hewlett-Packard Company Sampled servo seek and track follow system for a magnetic disc drive
AU597537B2 (en) * 1986-11-10 1990-05-31 Seagate Technology, Inc. Bipolar motor control
KR900005438B1 (ko) * 1987-12-11 1990-07-30 삼성전자 주식회사 플로피 디스크 드라이브(fdd)의 스텝모터 서보제어방식
GB2244395A (en) * 1990-05-25 1991-11-27 Motorola Inc Stepper motor controller
US5163162A (en) * 1990-11-14 1992-11-10 Ibm Corporation System and method for data recovery in multiple head assembly storage devices
US6713985B2 (en) * 2000-03-31 2004-03-30 Canon Kabushiki Kaisha Drive control apparatus for stepping motor
US7184480B1 (en) * 2002-09-25 2007-02-27 O2Micro International Limited Digital PWM generator
US7219172B1 (en) 2004-06-01 2007-05-15 Storage Technology Corporation System and method of dynamically controlling storage device access duty cycle
US7340617B1 (en) 2004-06-01 2008-03-04 Storage Technology Corporation System and method of dynamically controlling storage device power supply current
US7839595B1 (en) 2008-01-25 2010-11-23 Western Digital Technologies, Inc. Feed forward compensation for fly height control in a disk drive
US7630162B2 (en) * 2008-02-04 2009-12-08 Western Digital Technologies, Inc. Disk drive servoing off of first head while determining fly height for second head
US8482873B1 (en) * 2008-02-18 2013-07-09 Western Digital Technologies, Inc. Disk drive employing pulse width modulation of head control signal
US7675707B1 (en) 2008-11-21 2010-03-09 Western Digital Technologies, Inc. Disk drive employing repeatable disturbance compensation for fly height control
US8320069B1 (en) 2010-03-18 2012-11-27 Western Digital Technologies, Inc. Disk drive detecting positive correlation in fly height measurements
US8059357B1 (en) 2010-03-18 2011-11-15 Western Digital Technologies, Inc. Disk drive adjusting fly height when calibrating head/disk contact
US7916420B1 (en) 2010-05-14 2011-03-29 Western Digital Technologies, Inc. Disk drive employing comb filter for repeatable fly height compensation
US8300338B1 (en) 2010-09-30 2012-10-30 Western Digital Technologies, Inc. Disk drive correlating different fly height measurements to verify disk warpage

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562725A (en) * 1968-10-15 1971-02-09 Sperry Rand Corp Coarse and fine positioning of magnetic read heads
US4157577A (en) * 1977-11-14 1979-06-05 International Business Machines Corporation Rotatable storage apparatus with digitally responsive circuitry for track selection
US4371904A (en) * 1980-08-22 1983-02-01 Pertec Computer Corporation Flexible magnetic disk system
US4383209A (en) * 1980-10-15 1983-05-10 Minnesota Mining And Manufacturing Company Control system for transducer positioning motor
JPS5792470A (en) * 1980-11-29 1982-06-09 Yokogawa Hokushin Electric Corp Magnetic disk device
JPS57212665A (en) * 1981-06-24 1982-12-27 Fujitsu Ltd Head positioning system of magnetic device
JPS5835770A (ja) * 1981-08-24 1983-03-02 Hitachi Ltd 磁気デイスク装置
US4424543A (en) * 1981-11-16 1984-01-03 Dma Systems Corporation Method and apparatus for recording transducer positioning information
US4630145A (en) * 1982-02-16 1986-12-16 Drivetec, Inc. Fine positioning apparatus for floppy disk drive
US4581567A (en) * 1982-05-28 1986-04-08 Citizen Watch Co., Ltd. Device for feeding magnetic head
JPS5930269A (ja) * 1982-08-10 1984-02-17 Citizen Watch Co Ltd 磁気ヘツドの送り装置
US4488187A (en) * 1982-06-04 1984-12-11 Syquest Technology Servo control apparatus
JPS592977A (ja) * 1982-06-26 1984-01-09 武田　賢二 二輪車の風雨用具
US4499510A (en) * 1982-08-03 1985-02-12 Weltec Digital, Inc. Precision alignment system for information storage devices
US4516177A (en) * 1982-09-27 1985-05-07 Quantum Corporation Rotating rigid disk data storage device
JPS59177768A (ja) * 1983-03-28 1984-10-08 Hitachi Ltd フレキシブルデイスク駆動装置
JPS59204499A (ja) * 1983-05-09 1984-11-19 Matsushita Electric Works Ltd ステツピングモ−タ
US4600868A (en) * 1983-05-09 1986-07-15 Bryant Lawrence M Open loop acceleration/deceleration control for disk drive stepper motors
JPS59204498A (ja) * 1983-05-09 1984-11-19 Matsushita Electric Works Ltd ステツピングモ−タ
JPS60127576A (ja) * 1983-12-15 1985-07-08 Mitsubishi Electric Corp 磁気デイスク装置

Also Published As

Publication number Publication date
EP0191247A3 (en) 1987-09-02
IT8567122A0 (it) 1985-02-08
IT1182420B (it) 1987-10-05
US4775902A (en) 1988-10-04
JPS61198477A (ja) 1986-09-02
EP0191247B1 (en) 1991-02-27
DE3581925D1 (de) 1991-04-04
EP0191247A2 (en) 1986-08-20

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