US3846835A - Clean air system for magnetic storage disk pack - Google Patents

Clean air system for magnetic storage disk pack Download PDF

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Publication number
US3846835A
US3846835A US00365007A US36500773A US3846835A US 3846835 A US3846835 A US 3846835A US 00365007 A US00365007 A US 00365007A US 36500773 A US36500773 A US 36500773A US 3846835 A US3846835 A US 3846835A
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US
United States
Prior art keywords
clean
air
disks
read
clean air
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 - Lifetime
Application number
US00365007A
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English (en)
Inventor
B Horovitz
M Savage
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.)
Sperry Corp
Original Assignee
Sperry Rand 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 Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US00365007A priority Critical patent/US3846835A/en
Priority to GB2327274A priority patent/GB1458286A/en
Priority to DE2425575A priority patent/DE2425575C3/de
Priority to IT23295/74A priority patent/IT1012912B/it
Priority to FR7418386A priority patent/FR2232032B1/fr
Priority to JP49061423A priority patent/JPS5810789B2/ja
Application granted granted Critical
Publication of US3846835A publication Critical patent/US3846835A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G11B23/50—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges
    • G11B23/505—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges of disk carriers
    • 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
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/032—Containers for flat record carriers for rigid discs
    • G11B23/0323—Containers for flat record carriers for rigid discs for disc-packs
    • 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
    • G11B5/41—Cleaning of 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
    • G11B5/58—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
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion

Definitions

  • This invention relates to contamination control, clean air systems for a magnetic storage disk pack and more particularly to a system for supplying filtered clean air to the read-write heads of a magnetic storage system.
  • Read-write heads for a modern magnetic storage disk pack system are placed very close to the magnetic media in order to achieve the advantages of high density and high signal to noise ratio.
  • the manner for achieving a close spacing of a head adjacent a disk has been to load the carrier or shoe for the read-write heads with a force equal to the one developed under the carrier by the air rotating with the moving disk surface. Loads of greater magnitude will cause the carrier to be spaced closer to the disk. Disks cannot be made perfectly flat and inundations on the disk surface may greatly exceed the flying height of the carrier which will cause the carrier to be damaged by crashing into the magnetic media and/or damage the surface of the magnetic media. Such inundations may prevent the readwrite heads from properly performing the read-write process due to improper spacing.
  • Smoke particles from cigarettes are approximately one quarter of one mil in diameter. Fingerprint smudges may be one half of one mil in height. An average human hair may be three mils thick, and the diameter of dust particles in the air are almost as large as a human hair.
  • the best commercially available filters for clean air systems when operated under ideal conditions, will filter out contaminating particles larger than about fourteen micro inches. If the average contaminating particle size is smaller than the flying height of the carrier, there is less chance for the contaminating particles to interfere with the proper operation of the magnetic read-write heads.
  • prior art clean air systems did not provide a direct supply of clean air from the filter output to the head-disk interface.
  • Some prior art disk pack systems were assembled in a manner which caused inundations or distortions in the disk surface.
  • One prior art system employed a closed shroud around the disk pack to provide a plenum.
  • the plenum was further provided with inlet duct and an outlet duct and had an access for a movable head supporting carriage.
  • the source of clean filtered air was connected to the inlet duct of the plenum so that the clean filtered air mixed with all of the air inside the shrouded plenum including the air which was being exhausted from the disk and air outside the shroud which was being drawn into the shrouded plenum at the access opening for the movable carriage.
  • Such shrouded plenum systems require that the space outside the shroud or plenum be clean, and before starting such systems the shrouded plenum must be extensively purged.
  • Another prior art system conducts clean filtered air through a conduit and through a hollow shaft or passageway in the spindle of the disk pack to perforations of' apertures in the spacers between adjacent disks permitting the air to exhaust radially outward.
  • the air reaching the interface between the read-write head and the disk has been passed through the hub, shaft and slottcr rings in areas and around structures normally requiring lubrication, thus, increasing the danger of wearborn and lubricating contamination.
  • the apertured spindle or shaft is made from a series of slotted rings, the disk clamped between such adjacent rings are often distorted by non uniform clamping pressure.
  • the path of the clean filtered air from the output plenum chamber to the interface of the read-write head and the disk is made as short as possible and passes through conduits which can be kept clean and free of any kind of atmosphere or wearborn contamination.
  • a plurality of conduits through which clean filtered air is supplied.
  • the conduits extend from outside the disks inwardly between adjacent pairs of disks to provide streams of clean filtered air at points which are radially inward of the operative read-write heads.
  • the clean air flows radially and circumferentially outward due to pressure differential and to the pumping effect of the disks.
  • a layer of clean filtered air on the surface of the disks in which the read-write heads are flying The cleanliness of this layer is only limited by the characteristics of the filters in the source of the clean air.
  • FIG. 1 is a front elevation view of a disk pack system.
  • FIG. 2 is a plan view of a disk pack system of FIG. 1.
  • FIG. 3 is an enlarged elevation view in partial section taken at lines 3-3 of FIG. 2.
  • FIG. 4 is a schematic elevation view of shrouded disks.
  • FIG. 5 is a schematic elevation view of open disks.
  • FIG. 6 is a schematic plan view of air path according to the present invention.
  • FIG. 7 is a schematic elevation view of a preferred boundary layer of filtered air.
  • FIG. 8 is a curve of velocity versus distance from the surface of the magnetic disk.
  • FIG. 9 is an enlarged plan view in partial section of a preferred support for the read-write heads.
  • FIG. 10 is a side elevation view of the support of FIG. 9.
  • FIG. 11 is a schematic plan view of a modified form of shroud.
  • FIGS. 1 to 3 show a disk pack system 10 which is mounted in a cabinet 11.
  • Cabinet 11 is provided with a hinged top cover 12 which covers the disk pack assembly 13.
  • the disk pack assembly 13 is exposed and accessable in the upper compartment 14 of cabinet 11.
  • the drive assembly 15 for the disk pack assembly 13 is located in the lower compartment 16 of cabinet 11.
  • the upper and lower compartments 14 and 16 are separated by a reinforcing panel 17.
  • Reinforcing panel 17 supports a base casting 18 on which is located the actuator stacks 19 which comprise mounting blocks 21 and head mounts 22.
  • Individual disk 23 of the disk pack assembly 13 are spaced one from another by a plurality of cylindrical separator rings 24.
  • the rings 24 are held together by long bolts 25 which also hold top annular keeper 26 and bottom annular keeper 27 in place.
  • Annular keepers 26 and 27 have vertical depending legs 28 which serve the same purpose as the cylindrical separator rings 24 as will be explained hereinafter.
  • Shaft 31 is rotatably mounted in shaft housing 33 on bearings which are not shown.
  • Shaft housing 33 is fixedly mounted on base casting 18.
  • Drive motor 36, supported by base casting 18, is provided with a driving pulley 37 mounted on shaft 38.
  • a belt 39 connects driving pulley 37 to driven pulley 35 mounted on shaft 31.
  • Drive motor 36 is mounted on a subframe 41 which is connected by bolts 42 to the base casting 18.
  • Base casting 18 is mounted on a plurality of shock mounts 43 which are supported by reinforcing panel 17.
  • Clean filtered air is supplied to the individual disk 23 of the assembly pack 13 from the source of clean filtered air 44 which comprises a side inlet centrifugal blower 45 having a a filter (not shown) mounted at the inlet.
  • Centrifugal blower 45 has an exhaust duct 47 connected to a plenum 48 having a series of the best available absolute filters inside which provide clean filtered air.
  • the outlet of plenum 48 is connected by a flexible connection 49 to an adapter cover plate 51 attached to the bottom of the base casting 18.
  • Base casting 18 has a hollow annular chamber 52 which extends under the actuator stacks 19.
  • the clean filtered air from the plenum 48 is supplied intermediate adjacent disks 23 in a manner which prevents outside or contaminated ambient air from entering between adjacent disks and contaminating the surfaces of the disks 23.
  • an upper shield 57 is provided which aids in forcing the clean filtered air to flow radially outward and maintain the uppermost disks 23 clean.
  • a lower shield 58 is provided which aids in conducting the clean filtered air from the lowermost conduit to flow radially outward and maintain the lowermost disk 23 clean.
  • the read-write head assemblies 59 are provided with pivot pins 61 for pivotally mounting the head assembly on head mounts 22.
  • the pivot pins 61 are held in place by retainer springs 62.
  • the actuator stacks 19 including the head mounts 22 swing or slide into place intermediate adjacent disks 23 and once positioned are bolted and fixed.
  • the read-write head assembly 59 is fixed at a radial position but is free to pivot toward and away from the disk 23.
  • a plurality of readwrite heads 63 are permanently mounted in a shoe or slider 64 which is universally mounted on a spring arm 65 of the head assembly 59.
  • the read-write heads 63 in shoe 64 are not normally in the operable position until pressure is applied at pneumatic actuators 67.
  • the pneumatic actuators are operated by a source of compressed air (not shown) which enters at hose 68 into mounting block 21 and rises through hollow passageway 69 in mounting block 21 and head mounts 22. Hollow passageway 69 connects to chamber 71 via conduit 72. Pressure entering chamber 71 is sufficient to expand flexible diaphragn 73, held by ring 74, away from the chamber 71 so as to engage bearing disk 75 with bearing point 76 on arm 77 of the readwrite head assembly 59.
  • Spring 65 affixed at its cantilevered base to assembly 59, forces slider 64 toward disk 23.
  • the raised bearing cone 78 on spring 65 will engage the rear surface of shoe or slider 64 so as to force it into the operating position wherein the shoe 64 is floating on a film of air.
  • the lowermost read-write head assembly 59 is shown in the engaged or operable position wherein the shoe or slider 64 is floating on a film of air.
  • the uppermost read-write head assemblies are shown in the normal or inoperable position.
  • FIG. 4 is a schematic illustration of a pair of disks 23 having a shroud or enclosure 81 at the outer perimetrical edges of the disks. Assuming that the disks 23 are rotating, they act as smooth impeller centrifugal pumps to pump a thin film of air radially outward. When the air film reaches the radially outer position, it meets shroud 81 and is turned around and pulled inward by the pressure differential along center airflow path 83. Some of the center air 83 is turned around immediately and pumped radially outward; however, other portions of the center air 83 precede radially inward until a pressure balance is reached where it is pulled radially outward by the surface airflow path 84. When the pack of disks 13 depends upon the pumping action of the disks 23 for their inflow of center air, there is always created a dead airspace 82 at a radially inward position adjacent the cylindrical separator ring 24.
  • FIG. 5 is a schematic representation of a pair of adjacent disks 23 which are not affected by a shroud 81.
  • the center airflow path 83 precedes radially inward even though some of the air is being turned around.
  • the flow of air is pressure equalized and returns along the surface of the disks as the surface airflow path 84.
  • the pair of adjacent disks 23 are open as in FIG. 5, the amount of air which is pumped is larger than the amount of air pumped in a closed system as illustrated in FIG. 4. Even with this larger amount of air being pumped, there is still a dead air-space 82 adjacent the separator ring 24.
  • FIG. 6 is a schematic representation and plan view of a clean airstream path similar to that which is accomplished by the present invention.
  • the spiral air-path 85 is merely representative of the surface airflow which may take several revolutions of the disk 23 to reach the radially outer edge of the disk 23.
  • Outlet conduit 86 supplies clean filtered air at a point which is adjacent the separator rings 24 to eliminate the usual dead airspace 82 (not shown) and to supply air to the heads.
  • the rotational motion of the disk 23 causes the surface airflow of clean air to be pumped circumferentially along vector 89 and radially along velocity vector 91 providing a resultant velocity vector 92 which is exaggerated here for purposes of illustration.
  • the outlet conduit 86 may be affixed to head mount 22 as has been explained with the preferred embodiment.
  • a separate and independent conduit 86 may be employed.
  • an outlet conduit 87 having a plurality of outlets along the conduit and at the radially inward end may be employed. It will be understood that an outlet conduit similar to 87 may be fixed when used in conjunction with a movable carriage which supports read-write heads.
  • FIG. 7 is an enlarged schematic elevation showing the preferred flow of clean filtered air in a preferred embodiment of the present invention.
  • the clean filtered air is supplied at a point adjacent the separator rings 24 as described in conjunction with conduits 86 and 87 and FIG. 6, the clean filtered air 93 is pumped along the surface of the disk 23 supplying a boundary layer 94 of clean air which builds up over a very short distance to a thickness T approximately one thousand microinches.
  • This boundary layer 94 maintains a substantially constant thickness until it reaches the radially outer edge of disk 23.
  • the shoe 64 is supported in this surface airflow 95 at a height h which is one hundred microinches or less.
  • the amount of clean filtered air 93 supplied is in excess of the pumping rate of the disk 23 which pumps surface airflow outward. This excess of center airflow 96 is illustrated as moving radially outward even though it should be understood that all clean filtered air is moving both radially and circumferentially outward.
  • FIG. 8 is a curve illustrating the velocity of the clean filtered air versus the distance from the disk surface.
  • Curve 98 show that the radial clean air velocity vectors at the surface of the disk is zero. As the distance from the disk surface increases, the radial velocity increases rapidly and then tapers off to zero at thickness T.
  • the velocity components of clean filtered air motion which is tangential to the circumferential motion is represented by curve 99.
  • the circumferential velocity is highest at the surface of the disk where T equals zero and diminishes exponentially to approximately a thickness of one and a half times T where it remains substantially constant. Referring to FIGS.
  • a partial shrouding or discontinuous shrouding 97 is provided at the radially outer portion of the disk 23. This discontinuous shrouding 97 insures that ambient air will not enter between the adjacent disks and that the pumping rate of adjacent disks is significantly reduced as compared to what an open disk would ordinarily pump.
  • the actuator stacks 19 and the electronic PC boards 101 provide part of the aforementioned discontinuous shrouding 97.
  • Additional shrouding 102 may be provided and mounted on the actuator stacks 19.
  • a vertical space 103 is left open so that air 104 leaving the disk has a free escape passage.
  • a modified discontinuous shroud is schematically shown in FIG. 11 wherein curved deflection panels 106 are shaped to divert or deflect the flow of air 104 leaving the disk pack.
  • air 104 leaves the disk 23 at approximately 23 from a tangent line at the edge of the disk. The deflected air will build up pressure and fill any low pressure area which occurs at adjacent panels. Since the non-uniform radius curved deflection panels 106 are discontinuous, there is an outlet 103 provided for the air 104 constantly being supplied to the disks. In the event the pumping action of the adjacent disk attempts to pull air radially inward, clean filtered air inside the shroud rather than ambient outside air is provided.
  • the modified discontinuous shroud also serves to appreciably reduce the pumping rate as compared to open disks.
  • the outlets 103 are of sufficient area to maintain a flow rate below one thousand feet per minute.
  • Panels 106 may be alternately arranged with head mounts 22 and/or printed circuit boards 101, or may be arranged as a discontinuous shroud encompassing the mounts and/or the printed circuit boards 101, or may be arranged as a discontinuous shroud encompassing the mounts and/or the printed circuit boards.
  • An open shroud clean air system for a plurality of magnetic memory disks comprising:
  • a source of clean filtered air comprising a blower and an absolute filter system
  • said disks being spaced apart one from another by an imperforate cylindrical wall,
  • read-write head means extending between said spaced apart disks and supporting flying read-write heads thereon,
  • conduit means connected to said source of clean filtered air and extending inwardly between adjacent pairs of magnetic disks immediately upstream of said read-write heads,
  • conduit means comprising an outlet stream of clean filtered air supplied to a point radially inward of said memory tracks for maintaining continuous clean air flow at said read-write heads whereby said read-write heads are supported in a boundary layer consisting entirely of said clean filtered air.
  • said read-write heads means comprise mounts for supporting both said readwrite heads and said conduit means.
  • a clean air system as set forth in claim 6 which further includes baffie panels arranged circumferentially around the outside of said magnetic disk to further provide an open shroud effect.
  • baffie panels comprise circuit boards for electrical connection to said read-write heads.
  • a clean air system as set forth in claim 8 wherein said system is mounted in a base cabinet, and a quick access top cover on said cabinet forming an accumulator for clean air discharged from between said disks.
  • An open shroud clean air system for a plurality of magnetic memory disks comprising:
  • a source of clean filtered air comprising an absolute filter system and blower means in said cabinet, said source delivering filtered air at a pressure above atmospheric pressure,
  • said magnetic disk being separated one from the other by an imperforate cylindrical wall and receiving flying read-write heads therebetween,
  • conduit means connected to said source of clean filtered air and extending inwardly between each adjacent pair of magnetic disks,
  • conduit means providing clean filtered air at a point radially inward of said memory tracks and immediately upstream of said read-write heads, whereby the rotational motion of said disk pumps said clean air radially outward across the surface of said magnetic disks completely filling the space between said disks and causing said clean air to exhaust through said open shroud.
  • conduit means comprises a tubular entension having a plurality of openings therein for providing clean filtered air streams to the surface of said magnetic disks.

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US00365007A 1973-05-29 1973-05-29 Clean air system for magnetic storage disk pack Expired - Lifetime US3846835A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00365007A US3846835A (en) 1973-05-29 1973-05-29 Clean air system for magnetic storage disk pack
GB2327274A GB1458286A (en) 1973-05-29 1974-05-24 Magnetic disc stores
DE2425575A DE2425575C3 (de) 1973-05-29 1974-05-27 Anordnung fur die Zufuhrung gereinigter Luft zu einem Magnetspeicher aus einem Scheibenpaket
IT23295/74A IT1012912B (it) 1973-05-29 1974-05-28 Sistema ad aria pulita per pacchi di dischi di memorie magnetiche
FR7418386A FR2232032B1 (de) 1973-05-29 1974-05-28
JP49061423A JPS5810789B2 (ja) 1973-05-29 1974-05-29 ジキメモリ デイスク パツクヨウノセイジヨウクウキシステム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00365007A US3846835A (en) 1973-05-29 1973-05-29 Clean air system for magnetic storage disk pack

Publications (1)

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US3846835A true US3846835A (en) 1974-11-05

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US00365007A Expired - Lifetime US3846835A (en) 1973-05-29 1973-05-29 Clean air system for magnetic storage disk pack

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US (1) US3846835A (de)
JP (1) JPS5810789B2 (de)
DE (1) DE2425575C3 (de)
FR (1) FR2232032B1 (de)
GB (1) GB1458286A (de)
IT (1) IT1012912B (de)

Cited By (23)

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US4008492A (en) * 1975-07-23 1977-02-15 Control Data Corporation Thermally stabilized enclosure for magnetic disk
US4280155A (en) * 1979-06-04 1981-07-21 Memorex Mini Disc Drive Corp. Method of improving air flow in compact disc drive
EP0033680A1 (de) * 1980-01-31 1981-08-12 COMPAGNIE INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Plattform mit mindestens einem Wandler zum Wiedergeben und/oder Aufzeichnen auf einen Informationsträger
EP0054665A1 (de) * 1980-12-24 1982-06-30 International Business Machines Corporation Abgedichteter Magnetplatten-Datenspeicher
US4352133A (en) * 1977-07-18 1982-09-28 Nixdorf Computer Ag Magnetic disc memory
US4396964A (en) * 1980-07-02 1983-08-02 Storage Technology Corporation Recirculating air system for magnetic disk drive
US4488193A (en) * 1983-03-30 1984-12-11 International Business Machines Corporation Closed loop cooling system for disk file with heat exchanger integral with baseplate
US4581668A (en) * 1978-05-16 1986-04-08 Burroughs Corp. Disk contour cover having air filtration section
US4636891A (en) * 1982-02-11 1987-01-13 Cii Honeywell Bull Magnetic disc cartridge with ventilating structure
US4947275A (en) * 1988-03-23 1990-08-07 Digital Equipment Corp. Detachable head-load beam slider arm for disk drive
US5346518A (en) * 1993-03-23 1994-09-13 International Business Machines Corporation Vapor drain system
US5898545A (en) * 1997-07-01 1999-04-27 International Business Machines Corporation Head load/unload and disk airflow control apparatus
US6097568A (en) * 1998-08-04 2000-08-01 Ekhoff; Donald L. Air dams positioned between spinning disks for reducing the vibration in a data storage device
US20020063991A1 (en) * 2000-11-30 2002-05-30 Ashok Machcha Flow modification for reducing track misregistration in hard disk drives
US20020075591A1 (en) * 2000-06-14 2002-06-20 Yu-Li Chang Drive level flow-field conditioning to reduce flow field turbulence
US20030053391A1 (en) * 2001-09-10 2003-03-20 Braun Augustinus Laurentius Recording/reproducing device
US6574105B2 (en) * 2001-01-10 2003-06-03 Agilent Technologies, Inc. Housing for enclosing measuring apparatus for recording apparatus, provided with air blowing means including high efficiency particulate air filter
US20040103625A1 (en) * 2002-11-29 2004-06-03 Agilent Technologies, Inc. Air blower apparatus for use in inspection apparatus and inspection apparatus housing with the air blower apparatus
US20090229639A1 (en) * 2008-03-14 2009-09-17 Seagate Technology Llc Particle Purge System
US20110075547A1 (en) * 2009-09-25 2011-03-31 Samsung Electro-Mechanics Co., Ltd. Motor and disk drive apparatus
US20110108071A1 (en) * 2009-11-12 2011-05-12 Seagate Technology, Llc Motor-base assembly cleaning
US20110157745A1 (en) * 2009-12-29 2011-06-30 Ferdinand Hendriks Air pump in a hard disk drive (hdd)
US20110157744A1 (en) * 2009-12-29 2011-06-30 Ferdinand Hendriks Aerostatic sealing in a hard disk drive (hdd)

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JPS51133208U (de) * 1975-04-18 1976-10-27
US4190870A (en) * 1978-07-05 1980-02-26 International Business Machines Corporation Disk drive assembly
JPS5827589B2 (ja) * 1979-03-20 1983-06-10 日本電信電話株式会社 磁気デイスク記憶装置
US4317146A (en) * 1979-12-03 1982-02-23 Micropolis Corporation Compact magnetic disk storage system
US4367502A (en) * 1980-04-11 1983-01-04 Shugart Technology Fixed hard disc drive assembly and clean air system
JPH057666A (ja) * 1991-07-02 1993-01-19 Ace Denken:Kk トランプカード式ゲーム盤

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Cited By (32)

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US4008492A (en) * 1975-07-23 1977-02-15 Control Data Corporation Thermally stabilized enclosure for magnetic disk
US4352133A (en) * 1977-07-18 1982-09-28 Nixdorf Computer Ag Magnetic disc memory
US4581668A (en) * 1978-05-16 1986-04-08 Burroughs Corp. Disk contour cover having air filtration section
US4280155A (en) * 1979-06-04 1981-07-21 Memorex Mini Disc Drive Corp. Method of improving air flow in compact disc drive
EP0033680A1 (de) * 1980-01-31 1981-08-12 COMPAGNIE INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB) Plattform mit mindestens einem Wandler zum Wiedergeben und/oder Aufzeichnen auf einen Informationsträger
US4396964A (en) * 1980-07-02 1983-08-02 Storage Technology Corporation Recirculating air system for magnetic disk drive
EP0054665A1 (de) * 1980-12-24 1982-06-30 International Business Machines Corporation Abgedichteter Magnetplatten-Datenspeicher
US4636891A (en) * 1982-02-11 1987-01-13 Cii Honeywell Bull Magnetic disc cartridge with ventilating structure
US4488193A (en) * 1983-03-30 1984-12-11 International Business Machines Corporation Closed loop cooling system for disk file with heat exchanger integral with baseplate
US4947275A (en) * 1988-03-23 1990-08-07 Digital Equipment Corp. Detachable head-load beam slider arm for disk drive
US5346518A (en) * 1993-03-23 1994-09-13 International Business Machines Corporation Vapor drain system
US5898545A (en) * 1997-07-01 1999-04-27 International Business Machines Corporation Head load/unload and disk airflow control apparatus
US6097568A (en) * 1998-08-04 2000-08-01 Ekhoff; Donald L. Air dams positioned between spinning disks for reducing the vibration in a data storage device
US20020075591A1 (en) * 2000-06-14 2002-06-20 Yu-Li Chang Drive level flow-field conditioning to reduce flow field turbulence
US6989959B2 (en) 2000-06-14 2006-01-24 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
US6882501B2 (en) 2000-11-30 2005-04-19 Maxtor Corporation Flow modification for reducing track misregistration in hard disk drives
US20020063991A1 (en) * 2000-11-30 2002-05-30 Ashok Machcha Flow modification for reducing track misregistration in hard disk drives
US7215507B2 (en) 2000-11-30 2007-05-08 Maxtor Corporation Flow modification for reducing track misregistration in hard disk drives
US20050248878A1 (en) * 2000-11-30 2005-11-10 Maxtor Corporation Flow modification for reducing track misregistration in hard disk drives
US6574105B2 (en) * 2001-01-10 2003-06-03 Agilent Technologies, Inc. Housing for enclosing measuring apparatus for recording apparatus, provided with air blowing means including high efficiency particulate air filter
US6851119B2 (en) * 2001-09-10 2005-02-01 Koninklijke Philips Electronics N.V. Recording/reproducing device
US20030053391A1 (en) * 2001-09-10 2003-03-20 Braun Augustinus Laurentius Recording/reproducing device
US20040103625A1 (en) * 2002-11-29 2004-06-03 Agilent Technologies, Inc. Air blower apparatus for use in inspection apparatus and inspection apparatus housing with the air blower apparatus
US20090229639A1 (en) * 2008-03-14 2009-09-17 Seagate Technology Llc Particle Purge System
US20110075547A1 (en) * 2009-09-25 2011-03-31 Samsung Electro-Mechanics Co., Ltd. Motor and disk drive apparatus
US8213112B2 (en) * 2009-09-25 2012-07-03 Samsung Electro-Mechanics Co., Ltd. Motor having a pressure difference generation portion disposed in a space between a disk and rotor case and disk drive apparatus including the motor
US20110108071A1 (en) * 2009-11-12 2011-05-12 Seagate Technology, Llc Motor-base assembly cleaning
US8313579B2 (en) 2009-11-12 2012-11-20 Seagate Technology Llc Workpiece cleaning
US20110157745A1 (en) * 2009-12-29 2011-06-30 Ferdinand Hendriks Air pump in a hard disk drive (hdd)
US20110157744A1 (en) * 2009-12-29 2011-06-30 Ferdinand Hendriks Aerostatic sealing in a hard disk drive (hdd)
US8345378B2 (en) 2009-12-29 2013-01-01 Hitachi Global Storage Technologies, Netherlands B.V. Air pump in a hard disk drive (HDD)
US8345377B2 (en) * 2009-12-29 2013-01-01 Hgst, Netherlands B.V. Aerodynamic device directing pressurized airflow to ports in the device for aerostatic sealing in a hard disk drive(HDD)

Also Published As

Publication number Publication date
IT1012912B (it) 1977-03-10
DE2425575B2 (de) 1979-06-07
GB1458286A (en) 1976-12-15
FR2232032B1 (de) 1979-08-03
DE2425575C3 (de) 1980-02-14
JPS5028820A (de) 1975-03-24
DE2425575A1 (de) 1974-12-19
JPS5810789B2 (ja) 1983-02-28
FR2232032A1 (de) 1974-12-27

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