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GB1533778A - Magnetic test disc - Google Patents

Magnetic test disc

Info

Publication number
GB1533778A
GB1533778A GB1065176A GB1065176A GB1533778A GB 1533778 A GB1533778 A GB 1533778A GB 1065176 A GB1065176 A GB 1065176A GB 1065176 A GB1065176 A GB 1065176A GB 1533778 A GB1533778 A GB 1533778A
Authority
GB
United Kingdom
Prior art keywords
signals
test
head
disc
groups
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
GB1065176A
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of GB1533778A publication Critical patent/GB1533778A/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
    • 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
    • G11B5/016—Recording on, or reproducing or erasing from, magnetic disks using magnetic foils
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • G11B23/36—Signals on record carriers or on containers and 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
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/10—Indicating arrangements; Warning arrangements
    • 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
    • G11B5/455—Arrangements for functional testing of heads; Measuring arrangements for heads
    • 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
    • G11B5/5534—Initialisation, calibration, e.g. cylinder "set-up"
    • 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
    • G11B5/56—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 support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

1533778 Head adjustment in magnetic disc data systems BASF AG 17 March 1976 [2 Dec 1975] 10651/76 Heading G5R For use in adjusting the position of a magnetic head (13), Fig. 1 (not shown), when setting up a magnetic disc data system, a magnetic test disc has at least one test track (14) recorded with groups of first test signals, such as 4 to 9, Fig. 2, with intervening second test signals, such as 1 to 3, which have different amplitudes to those of the first signals, the first signals extending alternately on one side and then the other of the centre line 18 of the test track. The disc may be flexible and rotated at 360 r.p.m. The second signals are symmetrical relative to the centre line 18 and are arranged so that the test track has groups I, II &c. of test signals, each group having three of the second signals 1, 2, 3 and six of the first signals 4 to 9, there being from 4 to 36 such groups, preferably 6 or 12, in each test track. If the data system uses recording frequencies f and 2f, e.g. 250 KHz and 500 KHz, each of the signals 2 and 4 to 9 is recorded at f and each of the signals 1 and 3 at 2f. If the disc is running true with the head (13) accurately on the centreline 18, the test signals between lines 20 and 21 in Fig. 2 are reproduced with the relative amplitudes in Fig. 3 for display on an oscilloscope. If the disc is running eccentrically and/or the head is not accurately on the centreline, the replay amplitude U 1fi of the signals 4, 6, 8 differs from that U 1fo of the signals 5, 7, 9 and to achieve optimum positioning the head 13 is shifted until the difference of such amplitudes for group n of the test signals is equal to such difference for group n+N/2 and the head (13) is then locked in position, N being the number of groups I, II &c. (each consisting of signals 1 to 9) in the test track. The replay signals U 2fc corresponding to test signals 1 and 3 are used for azimuth adjustment of the head (13).
GB1065176A 1975-12-02 1976-03-17 Magnetic test disc Expired GB1533778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752554083 DE2554083C2 (en) 1975-12-02 1975-12-02 Magnetic disk, in particular flexible magnetic disk, for setting and controlling a recording and / or reproducing device

Publications (1)

Publication Number Publication Date
GB1533778A true GB1533778A (en) 1978-11-29

Family

ID=5963217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1065176A Expired GB1533778A (en) 1975-12-02 1976-03-17 Magnetic test disc

Country Status (4)

Country Link
JP (2) JPS597142B2 (en)
CA (1) CA1084621A (en)
DE (1) DE2554083C2 (en)
GB (1) GB1533778A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093886A3 (en) * 1982-06-22 1984-01-18 International Business Machines Corporation Manufacturing method and apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4456938A (en) * 1982-10-12 1984-06-26 International Business Machines Corporation Manufacturing apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4458274A (en) * 1982-06-22 1984-07-03 International Business Machines Corporation Manufacturing method and apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4458398A (en) * 1982-06-30 1984-07-10 International Business Machines Corporation Manufacturing apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4746580A (en) * 1983-03-31 1988-05-24 International Business Machines Corporation Read-only magnetic recording media
AU576859B2 (en) * 1984-05-18 1988-09-08 Basf Aktiengesellschaft Detecting error signals in a disk drive

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157577A (en) * 1977-11-14 1979-06-05 International Business Machines Corporation Rotatable storage apparatus with digitally responsive circuitry for track selection
DE3009548A1 (en) * 1980-03-13 1981-09-24 Ibm Deutschland Gmbh, 7000 Stuttgart TRACK CONTROL FOR MAGNETIC HEADS AND METHOD FOR COMPENSATING COMPARATIVE STORAGE SIZES
US4542428A (en) * 1982-10-01 1985-09-17 Matsushita Electric Industrial Co., Ltd. Disk for measuring off-track quantity of magnetic head, and measuring apparatus using the disk
US4513331A (en) * 1982-10-12 1985-04-23 Dysan Corporation Method and apparatus for disk drive alignment
JPS59112318U (en) * 1983-01-13 1984-07-28 アルプス電気株式会社 Head adjustment disk
JPS60140576A (en) * 1983-12-28 1985-07-25 Hitachi Ltd Magnetic recording medium for adjustment
JPS60134733U (en) * 1984-02-18 1985-09-07 梶田　肇 Cans, bottles, etc. with containers for holding snacks, etc.
JPS62122029U (en) * 1986-01-25 1987-08-03
JPS62201005U (en) * 1986-06-12 1987-12-22

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093886A3 (en) * 1982-06-22 1984-01-18 International Business Machines Corporation Manufacturing method and apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4458274A (en) * 1982-06-22 1984-07-03 International Business Machines Corporation Manufacturing method and apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4458398A (en) * 1982-06-30 1984-07-10 International Business Machines Corporation Manufacturing apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4456938A (en) * 1982-10-12 1984-06-26 International Business Machines Corporation Manufacturing apparatus for adjusting the position of a magnetic head in a flexible disk drive
US4746580A (en) * 1983-03-31 1988-05-24 International Business Machines Corporation Read-only magnetic recording media
AU576859B2 (en) * 1984-05-18 1988-09-08 Basf Aktiengesellschaft Detecting error signals in a disk drive

Also Published As

Publication number Publication date
CA1084621A (en) 1980-08-26
JPS61105968U (en) 1986-07-05
DE2554083C2 (en) 1985-03-28
JPS629571Y2 (en) 1987-03-05
JPS597142B2 (en) 1984-02-16
DE2554083A1 (en) 1977-06-23
JPS5269309A (en) 1977-06-09

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930317