JPS59218677A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS59218677A
JPS59218677A JP8118683A JP8118683A JPS59218677A JP S59218677 A JPS59218677 A JP S59218677A JP 8118683 A JP8118683 A JP 8118683A JP 8118683 A JP8118683 A JP 8118683A JP S59218677 A JPS59218677 A JP S59218677A
Authority
JP
Japan
Prior art keywords
set
heads
magnetic
track
magnetic heads
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.)
Pending
Application number
JP8118683A
Inventor
Toshio Negoro
Toru Shinohara
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8118683A priority Critical patent/JPS59218677A/en
Publication of JPS59218677A publication Critical patent/JPS59218677A/en
Application status is Pending legal-status Critical

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00Constructional parts, details or accessories not provided for in the preceding groups
    • G11B33/14Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • 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
    • G11B5/488Disposition of heads
    • G11B5/4886Disposition of heads relative to rotating disc
    • 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
    • G11B5/54Disposition 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
    • G11B5/55Track change, selection or acquisition by displacement of the head
    • G11B5/5521Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • 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
    • G11B5/54Disposition 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
    • G11B5/55Track change, selection or acquisition by displacement of the head
    • G11B5/5521Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5569Track change, selection or acquisition by displacement of the head across disk tracks details of specially adapted mobile parts, e.g. electromechanical control devices
    • G11B5/5578Multiple actuators addressing the same disk, e.g. to improve data rate or access rate

Abstract

PURPOSE:To control a magnetic head so as to reduce the off-track factor by dividing plural magnetic heads provided to an arm into plural groups to have a simultaneous access among these groups and at the same time constituting the groups with heads which receive the offsets of the similar levels due to temperatures. CONSTITUTION:It is possible to recognize the off-track state of each magnetic head by an experiment, etc. When a temperature change occurs under the con ditions where the selection of plural magnetic heads is inhibited from each arm in the same pair among 20 magnetic heads and the selection is inhibited for the magnetic heads that correspond to the magnetic disks. Therefore four units of H0 are collected in a set, and a set consists of H1-H4. Then the simultaneous read/write is carried out for each set. Thus the magnetic heads of the same set have the similar thermal off-track factors even if the magnetic head has an off-track. Therefore all heads of the corresponding set can be corrected with the same offset factor to give offset to those magnetic heads of the same set. Thus the on-track control is possible with all magnetic heads.
JP8118683A 1983-05-10 1983-05-10 Magnetic disk device Pending JPS59218677A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8118683A JPS59218677A (en) 1983-05-10 1983-05-10 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8118683A JPS59218677A (en) 1983-05-10 1983-05-10 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS59218677A true JPS59218677A (en) 1984-12-08

Family

ID=13739432

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8118683A Pending JPS59218677A (en) 1983-05-10 1983-05-10 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS59218677A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9142246B1 (en) * 2014-10-10 2015-09-22 Seagate Technology Llc Apparatus and methods to reduce hard disk drive manufacturing test time
US9361919B1 (en) 2014-10-10 2016-06-07 Seagate Technology Llc Disk drive with parallel head actuation
US10255943B1 (en) 2018-05-17 2019-04-09 Seagate Technology Llc Independent head, dual reader control logic

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9142246B1 (en) * 2014-10-10 2015-09-22 Seagate Technology Llc Apparatus and methods to reduce hard disk drive manufacturing test time
US9361919B1 (en) 2014-10-10 2016-06-07 Seagate Technology Llc Disk drive with parallel head actuation
US10255943B1 (en) 2018-05-17 2019-04-09 Seagate Technology Llc Independent head, dual reader control logic

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