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GB2121654A - Track identification code recording method - Google Patents

Track identification code recording method

Info

Publication number
GB2121654A
GB2121654A GB08317981A GB8317981A GB2121654A GB 2121654 A GB2121654 A GB 2121654A GB 08317981 A GB08317981 A GB 08317981A GB 8317981 A GB8317981 A GB 8317981A GB 2121654 A GB2121654 A GB 2121654A
Authority
GB
United Kingdom
Prior art keywords
disc
identification code
data
track identification
transition
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.)
Withdrawn
Application number
GB08317981A
Other versions
GB8317981D0 (en
Inventor
William A Pollock
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.)
DMA Systems Corp
Original Assignee
DMA Systems 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 DMA Systems Corp filed Critical DMA Systems Corp
Publication of GB8317981D0 publication Critical patent/GB8317981D0/en
Publication of GB2121654A publication Critical patent/GB2121654A/en
Withdrawn legal-status Critical Current

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
    • G11B5/58—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
    • 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

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Digital Magnetic Recording (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

In a magnetic disc for a magnetic disc storage system, at least one of the surfaces of the disc being coated with a magnetic material, the disc being adapted to be mounted on a spindle for rotation relative to a magnetic transducer positioned for recording data on and retrieving data from the surface, a plurality of concentric annular tracks (2, 1, 0, 15) being defined on the surface of the disc, each of the tracks being divided into a plurality of sectors, each such sector having associated therewith prerecorded data for identification thereof, the prerecorded identification data including a track identification code, the track identification code being a unit distance code, there is disclosed a method for recording the unit distance track identification code wherein the code has a first uni-directional clock transition (61) at a fixed time in each bit cell and a second uni-directional transition (N-N) at a variable time in each bit cell, the time of the second transition relative to the first transition determining whether the data bit is a one or a zero.
GB08317981A 1981-11-16 1982-04-01 Track identification code recording method Withdrawn GB2121654A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32188681A 1981-11-16 1981-11-16
PCT/US1982/000386 WO1983001859A1 (en) 1981-11-16 1982-04-01 Track identification code recording method

Publications (2)

Publication Number Publication Date
GB8317981D0 GB8317981D0 (en) 1983-08-03
GB2121654A true GB2121654A (en) 1983-12-21

Family

ID=23252463

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08317981A Withdrawn GB2121654A (en) 1981-11-16 1982-04-01 Track identification code recording method

Country Status (5)

Country Link
EP (1) EP0093713A4 (en)
JP (1) JPS58501879A (en)
BR (1) BR8207978A (en)
GB (1) GB2121654A (en)
WO (1) WO1983001859A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8702903A (en) * 1987-12-03 1989-07-03 Philips Nv METHOD AND APPARATUS FOR RECORDING INFORMATION ON A RECORD CARRIER, AND AN APPARATUS FOR READING THE RECORDED INFORMATION.
EP0332056A1 (en) * 1988-03-07 1989-09-13 Siemens Aktiengesellschaft Magnetic disc storage device with position control information recorded on a separate servo surface
US4977472A (en) * 1988-03-28 1990-12-11 Seagate Technology, Inc. Servo address system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281806A (en) * 1962-12-21 1966-10-25 Honeywell Inc Pulse width modulation representation of paired binary digits
US4027338A (en) * 1975-04-28 1977-05-31 Burroughs Corporation Transducer positioning system for providing coarse positioning
FR2346806A1 (en) * 1976-03-31 1977-10-28 Honeywell Bull Soc Ind MODE OF WRITING ADDRESS ON MAGNETIC RECORDING MEDIUM
FR2417824A1 (en) * 1978-02-17 1979-09-14 Cii Honeywell Bull HOW TO WRITE INFORMATION ON A MAGNETIC RECORDING MEDIA
FR2439435A1 (en) * 1978-10-19 1980-05-16 Cii Honeywell Bull WAY OF WRITING INFORMATION ON A MAGNETIC RECORDING MEDIUM
GB2060941B (en) * 1979-08-22 1983-11-02 Cii Honeywell Bull Method for displacement of a movable system with respect to a data carrier and a device for carrying it out
FR2470425A1 (en) * 1979-11-19 1981-05-29 Cii Honeywell Bull METHOD FOR MEASURING THE POSITION OF A READ-WRITE HEAD OF INFORMATION OF A MEDIUM IN RELATION TO A REFERENCE POSITION THEREOF AND DEVICE FOR IMPLEMENTING IT

Also Published As

Publication number Publication date
WO1983001859A1 (en) 1983-05-26
BR8207978A (en) 1983-10-04
JPS58501879A (en) 1983-11-04
EP0093713A4 (en) 1985-09-16
GB8317981D0 (en) 1983-08-03
EP0093713A1 (en) 1983-11-16

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)