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GB1470735A - Servo positioning systems for magnetic disc recording - Google Patents

Servo positioning systems for magnetic disc recording

Info

Publication number
GB1470735A
GB1470735A GB2587175A GB2587175A GB1470735A GB 1470735 A GB1470735 A GB 1470735A GB 2587175 A GB2587175 A GB 2587175A GB 2587175 A GB2587175 A GB 2587175A GB 1470735 A GB1470735 A GB 1470735A
Authority
GB
United Kingdom
Prior art keywords
signal
data
data signal
outputs
amplifiers
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.)
Expired
Application number
GB2587175A
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
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to GB2587175A priority Critical patent/GB1470735A/en
Priority to IT22180/76A priority patent/IT1064218B/en
Priority to FR7613468A priority patent/FR2315145A1/en
Priority to JP51066654A priority patent/JPS522510A/en
Priority to DE19762627002 priority patent/DE2627002A1/en
Publication of GB1470735A publication Critical patent/GB1470735A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G11B5/59605—Circuits
    • G11B5/59622—Gain control; Filters
    • 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

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Feedback Control In General (AREA)
  • Control Of Velocity Or Acceleration (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

1470735 Automatic position control INTERNATIONAL BUSINESS MACHINES CORP 18 June 1975 25871/75 Heading G3R In a system for positioning a transducer over a magnetic track on a recording disc, the transducer produces a data signal and a data-dependent position error signal. Each signal is passed through a respective variable gain amplifier, the gains of which are determined by the data signal, and multipliers are used to produce a servo error signal which is independent of the data signal. As shown in Fig. 2, three output connections a, b, c are made to a magneto-resistive transducer head 10 centred over a magnetic track. A differential amplifier 16 and low pass filter 20 produce a data signal D in response to outputs a and c, while a summing network, differential amplifier 18 and filter 22 combine all three outputs a, b and c to form a signal DS representing the product of the data signal and an error signal indicating departure of the head 10 from a central tracking position. Amplifiers 24, 26 have a common gain factor G, and the output of the amplifier 24 is squared in a multiplier 28 to form a signal G<SP>2</SP>D<SP>2</SP> which is maintained at a constant value K fed through a filter 30 to the gain inputs of the amplifiers 24, 26. A second multiplier 34 receives the outputs from the variable gain amplifiers 24, 26, and thus produces a signal G<SP>2</SP>D<SP>2</SP>S equal to KS and thus representing a data independent servo position error for use in centring the head. The multiplying circuits operate at high speed, while the effective division performed by the feedback gain control is done at a much lower speed.
GB2587175A 1975-06-18 1975-06-18 Servo positioning systems for magnetic disc recording Expired GB1470735A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB2587175A GB1470735A (en) 1975-06-18 1975-06-18 Servo positioning systems for magnetic disc recording
IT22180/76A IT1064218B (en) 1975-06-18 1976-04-12 IMPROVED SERVO POSITIONING EQUIPMENT FOR MAGNETIC DISC STORAGE UNIT
FR7613468A FR2315145A1 (en) 1975-06-18 1976-04-29 CONTROL SYSTEMS FOR MAGNETIC DISC MEMORY
JP51066654A JPS522510A (en) 1975-06-18 1976-06-09 Error signal circuit
DE19762627002 DE2627002A1 (en) 1975-06-18 1976-06-16 CIRCUIT ARRANGEMENT FOR SERVO CONTROL OF THE TRACK POSITION OF A MAGNETORESISTIVE READING HEAD GUIDED OVER A RECORDING TRACK OF A MOVING MAGNETIC RECORDING CARRIER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2587175A GB1470735A (en) 1975-06-18 1975-06-18 Servo positioning systems for magnetic disc recording

Publications (1)

Publication Number Publication Date
GB1470735A true GB1470735A (en) 1977-04-21

Family

ID=10234735

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2587175A Expired GB1470735A (en) 1975-06-18 1975-06-18 Servo positioning systems for magnetic disc recording

Country Status (5)

Country Link
JP (1) JPS522510A (en)
DE (1) DE2627002A1 (en)
FR (1) FR2315145A1 (en)
GB (1) GB1470735A (en)
IT (1) IT1064218B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6157510A (en) * 1998-03-10 2000-12-05 Maxtor Corporation Magnetic storage device with multiple read elements which are offset laterally and longitudinally
US6266205B1 (en) 1998-03-10 2001-07-24 Maxtor Corporation Parallel servo with ultra high bandwidth off-track detection
US6606216B1 (en) 1999-05-05 2003-08-12 Maxtor Corporation Transducer head with separate data and servo read elements

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52137371A (en) * 1976-05-13 1977-11-16 Fujitsu Ltd Position control system
DE2920912C2 (en) * 1978-05-29 1987-04-02 N.V. Philips' Gloeilampenfabrieken, Eindhoven Azimuth correction of head gaps
US4633344A (en) * 1985-05-28 1986-12-30 Eastman Kodak Company Unambiguously tracking a data track in response to signals derived from the track data itself
US5257148A (en) * 1989-05-30 1993-10-26 Tandberg Data As Method and apparatus for positioning a magnetic head in a magnetic layer memory system using tracking by reading a spaced pair of corresponding subtracks
FR3157542A1 (en) 2023-12-22 2025-06-27 Commissariat A L'energie Atomique Et Aux Energies Alternatives Raman spectrometry quantification method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR976680A (en) * 1948-12-21 1951-03-21 Apparatus for the electronic determination of quotients

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6157510A (en) * 1998-03-10 2000-12-05 Maxtor Corporation Magnetic storage device with multiple read elements which are offset laterally and longitudinally
US6266205B1 (en) 1998-03-10 2001-07-24 Maxtor Corporation Parallel servo with ultra high bandwidth off-track detection
US6606216B1 (en) 1999-05-05 2003-08-12 Maxtor Corporation Transducer head with separate data and servo read elements

Also Published As

Publication number Publication date
DE2627002A1 (en) 1977-01-20
JPS522510A (en) 1977-01-10
FR2315145A1 (en) 1977-01-14
IT1064218B (en) 1985-02-18
JPS5429363B2 (en) 1979-09-22
FR2315145B1 (en) 1978-05-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee