GB2019636A - Magnetic disc memory apparatus - Google Patents

Magnetic disc memory apparatus

Info

Publication number
GB2019636A
GB2019636A GB7913885A GB7913885A GB2019636A GB 2019636 A GB2019636 A GB 2019636A GB 7913885 A GB7913885 A GB 7913885A GB 7913885 A GB7913885 A GB 7913885A GB 2019636 A GB2019636 A GB 2019636A
Authority
GB
United Kingdom
Prior art keywords
disc
magnetic heads
magnetic
memory apparatus
stepper motor
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.)
Granted
Application number
GB7913885A
Other versions
GB2019636B (en
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.)
EMC Corp
Original Assignee
Data General 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
Priority claimed from US05/899,047 external-priority patent/US4163996A/en
Priority claimed from US05/899,044 external-priority patent/US4164769A/en
Priority claimed from US05/899,046 external-priority patent/US4194226A/en
Application filed by Data General Corp filed Critical Data General Corp
Publication of GB2019636A publication Critical patent/GB2019636A/en
Application granted granted Critical
Publication of GB2019636B publication Critical patent/GB2019636B/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
    • G11B5/48—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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof

Landscapes

  • Moving Of Heads (AREA)

Abstract

A magnetic head is driven across a rigid magnetic disc with high track density by a stepper motor in an open-loop fashion or without servomechanism control. The memory apparatus includes: band structure including a spring bias for coupling stepper motor drive to apparatus supporting magnetic heads above and/or below the spinning disc and for temperature compensation for disc/apparatus expansion and contraction; manually operable control for zeroing the magnetic heads, moving and locking them in the disc's landing zone as, for example, while in transit, and providing a travel limit to head movement when the memory apparatus is operating; keying apparatus for preventing erroneous insertion and mis-alignment of and damage to an optical transducer relative to an optical mask arranged to spin with the disc structure; shim apparatus for precisely positioning the magnetic heads in the spin axis direction; viscously-coupled inertia apparatus for damping the stepping motor's step-rotary motion; a device for employing spinning motion associated with the disc for cooling purposes; and other structure. <IMAGE>
GB7913885A 1978-04-24 1979-04-20 Magnetic disc memory apparatus Expired GB2019636B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US05/899,047 US4163996A (en) 1978-04-24 1978-04-24 Rigid magnetic disc memory apparatus employing stepper motor drive and pivotable head support with temperature compensation
US05/899,044 US4164769A (en) 1978-04-24 1978-04-24 Cross band coupling for stepper-motor-driven, rigid magnetic disc
US05/899,046 US4194226A (en) 1978-04-24 1978-04-24 Rigid magnetic disc memory apparatus including open loop stepper-motor-driven read/write head

Publications (2)

Publication Number Publication Date
GB2019636A true GB2019636A (en) 1979-10-31
GB2019636B GB2019636B (en) 1982-11-10

Family

ID=27420577

Family Applications (3)

Application Number Title Priority Date Filing Date
GB8129514A Expired GB2095885B (en) 1978-04-24 1979-04-20 Magnetic disc memory apparatus
GB8129523A Expired GB2089093B (en) 1978-04-24 1979-04-20 Magnetic disc memory apparatus
GB7913885A Expired GB2019636B (en) 1978-04-24 1979-04-20 Magnetic disc memory apparatus

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB8129514A Expired GB2095885B (en) 1978-04-24 1979-04-20 Magnetic disc memory apparatus
GB8129523A Expired GB2089093B (en) 1978-04-24 1979-04-20 Magnetic disc memory apparatus

Country Status (2)

Country Link
GB (3) GB2095885B (en)
NL (1) NL7902680A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534054A1 (en) * 1982-09-30 1984-04-06 Kennedy Cy UNIT OF MAGNETIC DISCS

Also Published As

Publication number Publication date
GB2095885B (en) 1983-03-09
GB2089093B (en) 1983-02-02
NL7902680A (en) 1979-10-26
GB2095885A (en) 1982-10-06
GB2089093A (en) 1982-06-16
GB2019636B (en) 1982-11-10

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Legal Events

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

Effective date: 19940420