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GB2229852B - Magnetic disc memory unit - Google Patents

Magnetic disc memory unit

Info

Publication number
GB2229852B
GB2229852B GB9008950A GB9008950A GB2229852B GB 2229852 B GB2229852 B GB 2229852B GB 9008950 A GB9008950 A GB 9008950A GB 9008950 A GB9008950 A GB 9008950A GB 2229852 B GB2229852 B GB 2229852B
Authority
GB
United Kingdom
Prior art keywords
memory unit
magnetic disc
disc memory
magnetic
unit
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 - Fee Related
Application number
GB9008950A
Other versions
GB2229852A (en
GB9008950D0 (en
Inventor
Paul Young
David Johnson
David W Richard
James A Augeri
Carl Bolz
Bruce Bickford
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.)
Raymond Engineering Inc
Original Assignee
Raymond Engineering Inc
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 GB8701250A external-priority patent/GB2187031B/en
Application filed by Raymond Engineering Inc filed Critical Raymond Engineering Inc
Publication of GB9008950D0 publication Critical patent/GB9008950D0/en
Publication of GB2229852A publication Critical patent/GB2229852A/en
Application granted granted Critical
Publication of GB2229852B publication Critical patent/GB2229852B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2018—Incorporating means for passive damping of vibration, either in the turntable, motor or mounting
    • 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
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
    • 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
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • 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
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1406—Reducing the influence of the temperature
    • 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
    • G11B5/5565—Track change, selection or acquisition by displacement of the head across disk tracks system adaptation for compensation of variations of physical parameters, e.g. temperature
    • 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
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1493—Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges
GB9008950A 1986-01-21 1990-04-20 Magnetic disc memory unit Expired - Fee Related GB2229852B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US82110186A 1986-01-21 1986-01-21
US94182086A 1986-12-15 1986-12-15
GB8701250A GB2187031B (en) 1986-01-21 1987-01-21 Magnetic disc memory unit

Publications (3)

Publication Number Publication Date
GB9008950D0 GB9008950D0 (en) 1990-06-20
GB2229852A GB2229852A (en) 1990-10-03
GB2229852B true GB2229852B (en) 1991-01-23

Family

ID=27263295

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9008950A Expired - Fee Related GB2229852B (en) 1986-01-21 1990-04-20 Magnetic disc memory unit

Country Status (1)

Country Link
GB (1) GB2229852B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2108703A1 (en) * 1992-12-23 1994-06-24 David W. Richard Magnetic disk drive unit
US5418667A (en) * 1993-08-03 1995-05-23 International Business Machines Corporation Slider with transverse ridge sections supporting air-bearing pads and disk drive incorporating the slider
US5808438A (en) * 1996-10-04 1998-09-15 Texas Instruments Incorporated Method and system for limiting current in a read/write head retract circuit
US6301082B1 (en) 1997-05-30 2001-10-09 Iomega Corporation Operating system for operating an eject system and a head retraction system of a disk drive
JP2003061304A (en) * 2001-08-10 2003-02-28 Alps Electric Co Ltd Disc device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1359511A (en) * 1970-06-29 1974-07-10 Information Storage Systems Control circuit arrangement for an actuator
WO1983001143A1 (en) * 1981-09-28 1983-03-31 Dma Systems Corp Emergency magnetic head retract system
GB2121589A (en) * 1982-06-03 1983-12-21 Tandon Corp Magnetic disk drive emergency head retract system
EP0204299A2 (en) * 1985-06-04 1986-12-10 Plus Development Corporation Modular unitary disk file subsystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1359511A (en) * 1970-06-29 1974-07-10 Information Storage Systems Control circuit arrangement for an actuator
WO1983001143A1 (en) * 1981-09-28 1983-03-31 Dma Systems Corp Emergency magnetic head retract system
GB2121589A (en) * 1982-06-03 1983-12-21 Tandon Corp Magnetic disk drive emergency head retract system
EP0204299A2 (en) * 1985-06-04 1986-12-10 Plus Development Corporation Modular unitary disk file subsystem

Also Published As

Publication number Publication date
GB2229852A (en) 1990-10-03
GB9008950D0 (en) 1990-06-20

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Legal Events

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

Effective date: 19970121