US20020174731A1 - Controlled particle deposition in drives and on media for thermal asperity studies - Google Patents

Controlled particle deposition in drives and on media for thermal asperity studies Download PDF

Info

Publication number
US20020174731A1
US20020174731A1 US10/198,340 US19834002A US2002174731A1 US 20020174731 A1 US20020174731 A1 US 20020174731A1 US 19834002 A US19834002 A US 19834002A US 2002174731 A1 US2002174731 A1 US 2002174731A1
Authority
US
United States
Prior art keywords
chamber
environmental
shutter
device under
under test
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.)
Abandoned
Application number
US10/198,340
Inventor
Vinod Sharma
Debasis Baral
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US10/198,340 priority Critical patent/US20020174731A1/en
Publication of US20020174731A1 publication Critical patent/US20020174731A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • G11B5/455—Arrangements for functional testing of heads; Measuring arrangements for heads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/002—Test chambers
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • 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

Definitions

  • the present invention relates to an environmental chamber used to test hard disk drives.
  • Hard disk drives include a plurality of transducers that are magnetically coupled to a number of rotating magnetic disks.
  • the transducers write and read information by magnetizing and sensing the magnetic field of the disks.
  • the transducers are typically integrated into heads that are mounted to suspension arms.
  • the suspension arms are attached to an actuator arm.
  • Information is typically stored within data sectors located in annular tracks of the disks.
  • the actuator arm is attached to a voice coil motor that can be energized to move the transducers to different tracks of the disks.
  • Each head has an air bearing surface that cooperates with an air flow generated by the rotating disks to create an air bearing between the transducers and the disk surface.
  • the air bearing prevents mechanical wear between the disk and the head. It is desirable to minimize the air bearing gap to optimize between magnetic coupling between the transducer and interference with the disk surface.
  • Disk drives are typically used in environments with varying temperatures, vibration, etc. Additionally, the disk drive may be exposed to contaminants that become deposited on the disk surfaces and degrade the performance of the drive. Most disk drives contain one or more filters that filter contaminates from the drive.
  • Disk drives are typically placed within an environmental chamber that can heat, vibrate and provide a shock load to the drive.
  • One embodiment of the present invention is an environmental chamber that contains a first chamber that is separated from a second chamber by a shutter.
  • a device under test can be placed in the first chamber and exposed to contaminants introduced from the second chamber through the shutter.
  • FIG. 1 is a schematic of an embodiment of an environmental chamber of the present invention.
  • the present invention includes an environmental chamber that can be used to test a device under test such as a hard disk drive. Controlled particles are placed at a known location.
  • the environmental chamber may include an electronically controlled shutter that controls the flow of controlled particles from a second chamber to a first chamber. The controlled particles flow to a device under test located within the first chamber. The shutter can be closed when a predetermined threshold of controlled particles is detected by the environmental chamber. Particle density is monitored with a particle counter.
  • FIG. 1 shows an embodiment of an environmental chamber 10 of the present invention.
  • the environmental chamber 10 may include a first chamber 12 that is separated from a second chamber 14 by a shutter 16 .
  • the first chamber 12 may include a vibration table 18 that is adapted to support a device under test (DUT) 20 .
  • the device under test 20 may be a hard disk drive, or a component of a disk drive such as a disk.
  • the vibration table 18 is configured to apply shock and vibration loads to the DUT 20 .
  • the first chamber 12 may also be coupled to a thermal unit 22 that can very the temperature within the chamber 12 .
  • the chamber 10 may inclue a door 23 that allows the DUT 20 to be placed in, and removed from, the first chamber 12 .
  • the second chamber 14 may include a port 24 that is in fluid communication with a reservoir of contaminants 26 .
  • the contaminants 26 may be compositionally identical to dust particles typically found in the working environment of a hard disk drive.
  • the environmental chamber 10 may further have a third chamber 28 that contains a first fan 30 and a second fan 32 .
  • the fans 30 and 32 generate a flow of air that passes through a porous wall 34 that separates the second 14 and third 28 chambers.
  • a particle Counter can be used to monitor the density of particles.
  • the shutter 16 may be configured to switch between an open position and a closed position. In the open position the shutter 16 may allow contaminants to flow from the second chamber 14 to the first chamber 12 . In the closed position the shutter 16 prevents fluid communication between the chambers 12 and 14 .
  • the third chamber 28 may include a deflector 36 that induces a circulation of air throughout the second chamber 14 without creating “dead spots” in the corners of the third chamber 28 .
  • the first chamber 12 may have a deflector 38 to circulate flow and prevent dead spots in the corners of the chamber 12 .
  • the first chamber 12 may include a first chamber detector 40 that can detect a quantity of controlled particles within the chamber 12 .
  • the second chamber 14 may include a second chamber detector 42 that can detect a quantity of contaminants within the chamber 14 .
  • the detectors 40 and 42 may be laser particle counters.
  • the chamber 10 may have one detector 40 or 42 , or both detectors 40 and 42 .
  • the chamber 10 may include or be coupled to a tester 44 that performs test on the DUT 20 during varying environmental conditions.
  • the tester 44 may drive the hard disk drive to write and then read information, and then evaluate the results.
  • the environmental chamber 10 may include a controller 46 that is connected to the shutter 16 , detectors 40 and 42 , tester 44 , vibration table 18 , thermal unit 22 and/or fans 30 and 32 .
  • the controller 46 may contain a microprocessor, memory, drivers, etc. and other circuits required to control the environmental chamber 10 .
  • the chamber 10 may be controlled in accordance with a software routine performed by the controller 46 .
  • the controller 46 may initiate a test routine by opening the shutter 16 to allow controlled particles to flow from the second chamber 14 to the first chamber 12 .
  • the controller 46 may close the shutter 16 when the detector 40 detects a predetermined quantity of contaminants within the first chamber 12 .
  • the controller 46 can then control the thermal unit 22 to vary temperature.
  • the vibration table 18 may be activated, either subsequent, or simultaneous with, the variation in chamber temperature.
  • the tester 44 can then perform test to test the DUT 20 .
  • the controller 46 can open the shutter 16 for a time period(s) computed from the quantity of contaminants detected in the first chamber 12 , contaminant density in the second chamber 14 and the flowrate generated by the fans 30 and 32 .
  • Controlled particles can be replaced by fluids or particles suspended in fluids.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

An environmental chamber that can be used to test a device under test such as a hard disk drive. The environmental chamber may include an electronically controlled shutter that controls the flow of controlled particles from a second chamber to a first chamber. The controlled particles flow to a device under the test located within the first chamber. The shutter can be closed when a predetermined threshold of contaminants is detected by the environmental chamber. This two-chamber method provides a stable and uniform density (?) of particle environment around the drive.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates to an environmental chamber used to test hard disk drives. [0002]
  • 2. Prior Art [0003]
  • Hard disk drives include a plurality of transducers that are magnetically coupled to a number of rotating magnetic disks. The transducers write and read information by magnetizing and sensing the magnetic field of the disks. The transducers are typically integrated into heads that are mounted to suspension arms. The suspension arms are attached to an actuator arm. Information is typically stored within data sectors located in annular tracks of the disks. The actuator arm is attached to a voice coil motor that can be energized to move the transducers to different tracks of the disks. [0004]
  • Each head has an air bearing surface that cooperates with an air flow generated by the rotating disks to create an air bearing between the transducers and the disk surface. The air bearing prevents mechanical wear between the disk and the head. It is desirable to minimize the air bearing gap to optimize between magnetic coupling between the transducer and interference with the disk surface. [0005]
  • Disk drives are typically used in environments with varying temperatures, vibration, etc. Additionally, the disk drive may be exposed to contaminants that become deposited on the disk surfaces and degrade the performance of the drive. Most disk drives contain one or more filters that filter contaminates from the drive. [0006]
  • When designing a hard disk drive it is desirable to test design prototypes to determine certain performance characteristics during changing environmental conditions. Disk drives are typically placed within an environmental chamber that can heat, vibrate and provide a shock load to the drive. [0007]
    • BRIEF SUMMARY OF THE INVENTION
  • One embodiment of the present invention is an environmental chamber that contains a first chamber that is separated from a second chamber by a shutter. A device under test can be placed in the first chamber and exposed to contaminants introduced from the second chamber through the shutter. [0008]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic of an embodiment of an environmental chamber of the present invention. [0009]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The present invention includes an environmental chamber that can be used to test a device under test such as a hard disk drive. Controlled particles are placed at a known location. The environmental chamber may include an electronically controlled shutter that controls the flow of controlled particles from a second chamber to a first chamber. The controlled particles flow to a device under test located within the first chamber. The shutter can be closed when a predetermined threshold of controlled particles is detected by the environmental chamber. Particle density is monitored with a particle counter. [0010]
  • Referring to the drawings more particularly by reference numbers, FIG. 1 shows an embodiment of an [0011] environmental chamber 10 of the present invention. The environmental chamber 10 may include a first chamber 12 that is separated from a second chamber 14 by a shutter 16. The first chamber 12 may include a vibration table 18 that is adapted to support a device under test (DUT) 20. The device under test 20 may be a hard disk drive, or a component of a disk drive such as a disk. The vibration table 18 is configured to apply shock and vibration loads to the DUT 20. The first chamber 12 may also be coupled to a thermal unit 22 that can very the temperature within the chamber 12. The chamber 10 may inclue a door 23 that allows the DUT 20 to be placed in, and removed from, the first chamber 12.
  • The [0012] second chamber 14 may include a port 24 that is in fluid communication with a reservoir of contaminants 26. The contaminants 26 may be compositionally identical to dust particles typically found in the working environment of a hard disk drive.
  • The [0013] environmental chamber 10 may further have a third chamber 28 that contains a first fan 30 and a second fan 32. The fans 30 and 32 generate a flow of air that passes through a porous wall 34 that separates the second 14 and third 28 chambers. A particle Counter can be used to monitor the density of particles.
  • The [0014] shutter 16 may be configured to switch between an open position and a closed position. In the open position the shutter 16 may allow contaminants to flow from the second chamber 14 to the first chamber 12. In the closed position the shutter 16 prevents fluid communication between the chambers 12 and 14.
  • The [0015] third chamber 28 may include a deflector 36 that induces a circulation of air throughout the second chamber 14 without creating “dead spots” in the corners of the third chamber 28. Likewise, the first chamber 12 may have a deflector 38 to circulate flow and prevent dead spots in the corners of the chamber 12.
  • The [0016] first chamber 12 may include a first chamber detector 40 that can detect a quantity of controlled particles within the chamber 12. The second chamber 14 may include a second chamber detector 42 that can detect a quantity of contaminants within the chamber 14. By way of example, the detectors 40 and 42 may be laser particle counters. The chamber 10 may have one detector 40 or 42, or both detectors 40 and 42.
  • The [0017] chamber 10 may include or be coupled to a tester 44 that performs test on the DUT 20 during varying environmental conditions. For example, the tester 44 may drive the hard disk drive to write and then read information, and then evaluate the results.
  • The [0018] environmental chamber 10 may include a controller 46 that is connected to the shutter 16, detectors 40 and 42, tester 44, vibration table 18, thermal unit 22 and/or fans 30 and 32. The controller 46 may contain a microprocessor, memory, drivers, etc. and other circuits required to control the environmental chamber 10. The chamber 10 may be controlled in accordance with a software routine performed by the controller 46. By way of example, the controller 46 may initiate a test routine by opening the shutter 16 to allow controlled particles to flow from the second chamber 14 to the first chamber 12. The controller 46 may close the shutter 16 when the detector 40 detects a predetermined quantity of contaminants within the first chamber 12. The controller 46 can then control the thermal unit 22 to vary temperature. The vibration table 18 may be activated, either subsequent, or simultaneous with, the variation in chamber temperature. The tester 44 can then perform test to test the DUT 20. The controller 46 can open the shutter 16 for a time period(s) computed from the quantity of contaminants detected in the first chamber 12, contaminant density in the second chamber 14 and the flowrate generated by the fans 30 and 32.
  • While certain exemplary embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that this invention not be limited to the specific constructions and arrangements shown and described, since various other modifications may occur to those ordinarily skilled in the art. Controlled particles can be replaced by fluids or particles suspended in fluids. [0019]

Claims (20)

What is claimed is:
1. An environmental chamber to test a device under test, comprising:
a first chamber adapted to contain the device under test;
a second chamber that contains controlled particles;
a shutter located between said first and second chambers, said shutter being adapted to switch between an open position and a closed position; and,
a fan that is coupled to said second chamber and which generates a flow of air that moves the contaminant from said second chamber to said first chamber when said shutter is in an open position.
2. The environmental chamber of claim 1, further comprising a controller that can switch said shutter between the open and closed positions.
3. The environmental chamber of claim 2, further comprising a first chamber detector that is coupled to said controller and can detect a quantity of the contaminant within said first chamber.
4. The environmental chamber of claim 2, further comprising a second chamber detector that is coupled to said controller and can detect a quantity of the contaminant within said second chamber.
5. The environmental chamber of claim 1, further comprising a third chamber that contains said fan.
6. The environmental chamber of claim 5, wherein said third chamber contains a deflector.
7. The environmental chamber of claim 1, wherein said first chamber contains a deflector.
8. The environmental chamber of claim 1, further comprising a tester that can be coupled to the device under test.
9. The environmental chamber of claim 1, further comprising a thermal unit that is coupled to said first chamber.
10. The environmental chamber of claim 1, further comprising a vibration table that can vibrate the device under test.
11. An environmental chamber to test a device under test, comprising:
a first chamber adapted to contain the device under test;
a second chamber that contains a contaminant;
a shutter located between said first and second chambers, said shutter being adapted to switch between an open position and a closed position;
a fan that is coupled to said second chamber and which generates a flow of air that moves the contaminant from said second chamber to said first chamber when said shutter is in an open position;
a first chamber detector that can detect a quantity of the contaminant in said first chamber; and
a controller that is connected to said shutter, and said first chamber detector, said controller opens said shutter until said first chamber contains a predetermined quantity of contaminants.
12. The environmental chamber of claim 11, further comprising a second chamber detector that can detect a quantity of contaminants in said second chamber.
13. The environmental chamber of claim 11, further comprising a third chamber that contains said fan.
14. The environmental chamber of claim 13, wherein said third chamber contains a deflector.
15. The environmental chamber of claim 11, wherein said first chamber contains a deflector.
16. The environmental chamber of claim 11, further comprising a tester that can be coupled to the device under test.
17. A method for testing a hard disk drive, comprising:
placing a hard disk drive in a first chamber;
moving controlled particles from a second chamber to the first chamber; and,
testing the hard disk drive.
18. The method of claim 17, further comprising opening a shutter to allow controlled particles to move from the first chamber to the second chamber, detecting a quantity of controlled particles within the first chamber and closing the shutter when there is a predetermined quantity of contaminants within the first chamber.
19. The method of claim 17, further comprising varying the temperature of the hard disk drive.
20. The method of claim 17, further comprising vibrating the hard disk drive.
US10/198,340 2000-11-20 2002-07-17 Controlled particle deposition in drives and on media for thermal asperity studies Abandoned US20020174731A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/198,340 US20020174731A1 (en) 2000-11-20 2002-07-17 Controlled particle deposition in drives and on media for thermal asperity studies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/717,456 US6446517B1 (en) 2000-11-20 2000-11-20 Controlled particle deposition in drives and on media for thermal asperity studies
US10/198,340 US20020174731A1 (en) 2000-11-20 2002-07-17 Controlled particle deposition in drives and on media for thermal asperity studies

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/717,456 Division US6446517B1 (en) 2000-11-20 2000-11-20 Controlled particle deposition in drives and on media for thermal asperity studies

Publications (1)

Publication Number Publication Date
US20020174731A1 true US20020174731A1 (en) 2002-11-28

Family

ID=24882101

Family Applications (2)

Application Number Title Priority Date Filing Date
US09/717,456 Expired - Lifetime US6446517B1 (en) 2000-11-20 2000-11-20 Controlled particle deposition in drives and on media for thermal asperity studies
US10/198,340 Abandoned US20020174731A1 (en) 2000-11-20 2002-07-17 Controlled particle deposition in drives and on media for thermal asperity studies

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US09/717,456 Expired - Lifetime US6446517B1 (en) 2000-11-20 2000-11-20 Controlled particle deposition in drives and on media for thermal asperity studies

Country Status (2)

Country Link
US (2) US6446517B1 (en)
KR (1) KR100442866B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102959369A (en) * 2011-05-20 2013-03-06 SMInstrument株式会社 Device and method for measuring noise of hard disk drive
EP3249391A4 (en) * 2016-03-24 2019-03-20 Cosmecca Korea Co. Ltd. Apparatus for creating artificial atmospheric environment containing fine dust, and system for analyzing fine dust blocking ability of cosmetics by using same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6959586B2 (en) * 2001-11-07 2005-11-01 Seagate Technology Llc Evaluating data handling devices by means of a marker impurity
US7252850B2 (en) * 2003-05-30 2007-08-07 Delavau Llc High protein and high fiber food products
KR100520895B1 (en) * 2003-08-07 2005-10-13 한국생산기술연구원 Thermal-Insulation Measuring System
WO2018037253A1 (en) * 2016-08-24 2018-03-01 Fuchs Petrolub Se Test apparatus and method for testing dust suppression systems
US10591383B2 (en) * 2016-08-26 2020-03-17 Oracle International Corporation Characterizing the I/O-performance-per-watt of a computing device across a range of vibrational operating environments

Family Cites Families (127)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558831A (en) 1968-04-18 1971-01-26 Bell Telephone Labor Inc Telephone set base structure with exterior plug cavities in the base bottom secured by a detachable baseplate
US4110802A (en) 1977-05-26 1978-08-29 Memorex Corporation Crash stop for disc drive actuator
FR2420809A1 (en) 1978-03-24 1979-10-19 Cii Honeywell Bull READ-WRITE DEVICE FOR AN INFORMATION MEDIA WITH LOW-LOAD RAMP TAKING
DE2905414B1 (en) 1979-02-10 1980-04-24 Cpt Comp Peripherie Technik Gm Magnetic disk storage
US4493554A (en) 1979-02-27 1985-01-15 Diffracto Method and apparatus for determining physical characteristics of objects and object surfaces
NL8102524A (en) 1981-05-22 1982-12-16 Philips Nv SWIVEL ARM DEVICE FOR MAGNETIC DISC MEMORY DEVICE.
FR2518791B1 (en) 1981-12-23 1987-09-18 Antoine Louis LIGHTING DEVICE FOR ELECTROPHONE READING HEAD
US4555739A (en) 1982-11-26 1985-11-26 International Business Machines Corporation Semi self-loading ferrite head
US4562500A (en) 1983-05-25 1985-12-31 Tandon Corporation Mechanism for latching magnetic disk memory head/arm assembly in parking zone
JPS60131408A (en) 1983-12-21 1985-07-13 Hitachi Ltd Image scanning type automatic measuring device for flying height
DE3404196A1 (en) 1984-02-07 1985-08-08 Siemens AG, 1000 Berlin und 8000 München MAGNETIC DISK STORAGE WITH BEARINGS TENSIONED BY A MEMBRANE SPRING OF A STACK OF DISKS STORED ON TWO SIDES
JPS60163592U (en) 1984-04-07 1985-10-30 ソニー株式会社 Vehicle optical disc player
JPH0249038Y2 (en) 1984-10-11 1990-12-21
US4661873A (en) 1984-11-14 1987-04-28 Lapine Technology Head lifter mechanism for hard disk drive
JPS61187633A (en) * 1985-02-16 1986-08-21 Sharp Corp Test apparatus
US4673996B1 (en) 1985-04-29 1997-02-04 James W White Magnetic head air bearing slider assembly utilizing transverse pressurization contours
JPS6220187A (en) 1985-07-19 1987-01-28 Toshiba Corp Magnetic disc device
JPS6230935A (en) * 1985-08-01 1987-02-09 Tabai Esupetsuku Kk Exposure tester
US4703376A (en) 1985-09-23 1987-10-27 Lapine Technology Apparatus for loading and retracting magnetic head in a disk drive
DE3704898A1 (en) 1986-02-20 1987-08-27 Sharp Kk DISKETTE RECORDING PROCEDURE
US4802042A (en) 1987-02-05 1989-01-31 Magnetic Peripherals Inc. Side-vented magnetic head air bearing slider
US5029026A (en) 1987-05-29 1991-07-02 Conner Peripherals, Inc. Disk drive architecture
US4819105A (en) 1987-10-26 1989-04-04 Edwards William J Spacer for disks in a disk drive
US4870519B1 (en) 1987-11-20 1997-01-28 James W White Uniform flying height slider assembly with improved dynamic air bearing characteristics
US5175661A (en) 1988-03-15 1992-12-29 Fuji Photo Film Co., Ltd. Magnetic tape cassette having positioning holes with wear-resistant coatings
EP0555943B1 (en) 1988-04-06 1996-06-19 Mitsubishi Denki Kabushiki Kaisha Optical distance detector
US4949206A (en) 1988-07-29 1990-08-14 Miniscribe Corporation Crash stop for rotary disk drive actuator
US4890172A (en) 1988-09-27 1989-12-26 Digital Equipment Corporation Automatic servo gain calibration system for a disk drive
JPH02130783A (en) 1988-11-11 1990-05-18 Nippon I B M Kk Vibration damping structure and magnetic disk device
US4982300A (en) 1988-12-09 1991-01-01 Magnetic Peripherals Inc. Restrictively damped actuator mount for disc drives
US5097370A (en) 1989-03-17 1992-03-17 Digital Equipment Corporation Subambient pressure air bearing slider for disk drive
US6226143B1 (en) 1989-07-31 2001-05-01 Seagate Technology Llc Disk drive having support posts aligned with storage disk and actuator mounting points to reduce mechanical off-tracking
US5241438A (en) 1989-09-12 1993-08-31 Kyocera Corporation Magnetic disk drive device with mechanical parking mechanism
US5121263A (en) 1989-10-31 1992-06-09 International Business Machines Corporation Method and apparatus for determining the error rate of magnetic recording disk drives having a amplitude sampling data detection
US5293282A (en) 1989-11-03 1994-03-08 Conner Peripherals, Inc. Multiple actuator disk drive
JPH03276475A (en) 1990-03-27 1991-12-06 Matsushita Electric Ind Co Ltd Magnetic disk device
US5062017A (en) 1990-05-25 1991-10-29 Seagate Technology, Inc. Hour-glass disk head slider
US5343343A (en) 1990-05-25 1994-08-30 Seagate Technology, Inc. Air bearing slider with relieved rail ends
US5200868A (en) 1990-05-25 1993-04-06 Seagate Technology, Inc. Negative pressure air bearing slider having an air bearing surface trailing a negative pressure cavity
US5128822A (en) 1990-05-25 1992-07-07 Seagate Technology, Inc. Configuration for negative pressure air bearing sliders
EP0463752A3 (en) 1990-06-29 1993-02-03 Digital Equipment Corporation Pattern matching circuit
JPH0478074A (en) 1990-07-12 1992-03-12 Matsushita Electric Ind Co Ltd Head slider locking device
KR930702085A (en) * 1990-09-24 1993-09-08 레이몬드 지. 트위그 Electronics test processor
US5365389A (en) 1990-11-09 1994-11-15 Seagate Technology, Inc. Crash stop and magnetic latch for optimum use of disc space
US5262913A (en) 1990-11-09 1993-11-16 Seagate Technology, Inc. Easily adjustable crash stop for a disc drive
JP3210680B2 (en) 1990-12-18 2001-09-17 パイオニア株式会社 Information playback device
DE69131993T2 (en) 1990-12-19 2000-07-20 Mobile Storage Technology Inc MINIATURE HARD DISK DRIVE FOR PORTABLE COMPUTER
US5159508A (en) 1990-12-27 1992-10-27 International Business Machines Corporation Magnetic head slider having a protective coating thereon
JP3104079B2 (en) 1991-02-13 2000-10-30 旭電機株式会社 Ground electrode and construction method
JP2685988B2 (en) 1991-03-15 1997-12-08 株式会社日立製作所 Magnetic disk drive
US5875067A (en) 1991-03-22 1999-02-23 Seagate Technology, Inc. Acoustic isolator for a disc drive assembly
US5187621A (en) 1991-03-25 1993-02-16 Quantum Corporation RFI/EMI reduction for head and disk assembly
US5267109A (en) 1991-06-14 1993-11-30 Seagate Technology, Inc. Air bearing slider with relieved trailing edge
US5202803A (en) 1991-07-02 1993-04-13 International Business Machines Corporation Disk file with liquid film head-disk interface
US5214549A (en) 1991-07-12 1993-05-25 Seagate Technology, Inc. Acoustically damped disc drive assembly
GB9115287D0 (en) * 1991-07-15 1991-08-28 Antibioticos Spa Process for the preparation of cephalosporins intermediates
US5287235A (en) 1991-10-28 1994-02-15 International Business Machines Corporation Slider air bearing surface with angled rail configuration
US5167167A (en) 1991-11-18 1992-12-01 United Technologies Corporation Rotor trim balancing
US5270887A (en) 1991-12-04 1993-12-14 Western Digital Corporation Compact disk drive head disk assembly with conformable tape seal
US5243495A (en) 1992-03-20 1993-09-07 Digital Equipment Corporation Removable enclosure housing a rigid disk drive
US5161900A (en) 1992-04-10 1992-11-10 International Business Machines, Corp. Self-contained low power fluid bearing and bearing seal
US5460017A (en) 1992-05-21 1995-10-24 Eti Technologies Inc. Weight compensating apparatus
US5307018A (en) * 1992-07-01 1994-04-26 Ashok Gadgil Apparatus and method to detect an impending failure of a cirucit caused by deposits of aerosol
JPH0650779A (en) 1992-08-03 1994-02-25 Sony Corp Self-diagnosing method and control apparatus for the same
DE69329036T2 (en) 1992-09-23 2000-11-16 Seagate Technology SHAPE FACTOR 2.5 INCH DISK DRIVE LOW HEIGHT
US5540109A (en) * 1992-11-05 1996-07-30 Qualmark Corporation Apparatus and method for thermal and vibrational stress screening
US5369538A (en) 1992-11-12 1994-11-29 Mitsumi Electric Co., Ltd. Rotary disk drive actuator
JPH06203515A (en) 1992-11-30 1994-07-22 Read Rite Corp Magnetic-head slider
US5404256A (en) 1992-12-07 1995-04-04 White; James W. Transverse and negative pressure contour gas bearing slider
US5319511A (en) 1993-01-19 1994-06-07 Quantum Corporation Aerodynamic actuator latch with magnetic return spring for hard disk drive
US5381701A (en) * 1993-03-26 1995-01-17 At&T Corp. Dust particle exposure chamber
US5396386A (en) 1993-05-28 1995-03-07 International Business Machines Corporation Roll insensitive air bearing slider
US5402290A (en) 1993-06-14 1995-03-28 Seagate Technology, Inc. One piece limit stop for disc drive
US5546250A (en) 1993-06-24 1996-08-13 Maxtor Corporation Elastomer gasket that extends around the outer edge of a hard drive
US5754353A (en) 1993-07-01 1998-05-19 Cirrus Logic, Inc. Channel quality circuit in a sampled amplitude read channel
US5463527A (en) 1993-10-06 1995-10-31 Allen-Bradley Company, Inc. Suspension system for disk drives utilizing shear loaded elastomeric supports of different durometer hardnesses and elastomeric pads
EP0728353B1 (en) 1993-11-12 2001-05-30 Seagate Technology LLC Stackable actuator assembly
JPH07211033A (en) 1993-12-23 1995-08-11 Hutchinson Technol Inc Head suspension assembly
US5422776A (en) 1993-12-27 1995-06-06 Maxtor Corporation Improvement in a magnetic disk drive for balancing a disk pack assembly
US5442638A (en) 1994-01-10 1995-08-15 International Business Machines Corporation Apparatus and method for recording over defects in storage media
JP3087809B2 (en) 1994-01-14 2000-09-11 富士通株式会社 Frame structure for disk drive
US5410402A (en) 1994-01-24 1995-04-25 Seagate Technology, Inc. Calibration standard for flying height tester having a wedge slider and a transparent disc held together
MY115952A (en) 1994-04-25 2003-10-31 Sony Corp Cd/cd-rom apparatus
KR970010637B1 (en) 1994-04-27 1997-06-28 삼성전자 주식회사 Lead channel optimization method using error rate in disk driver
US5537272A (en) 1994-05-02 1996-07-16 Seagate Technology, Inc. Spindle balance device for a hard disk drive assembly
KR0175255B1 (en) 1994-07-07 1999-04-15 김광호 Magnetic recording head for hard disc drive
JP2594760B2 (en) 1994-07-20 1997-03-26 茨城日本電気株式会社 Shock absorber for magnetic disk drive
US6239943B1 (en) 1994-07-22 2001-05-29 Seagate Technology Llc Squeeze film damping for a hard disc drive
US5526205A (en) 1994-08-29 1996-06-11 International Business Machines Corporation Transducer suspension system
US6108163A (en) 1994-10-12 2000-08-22 International Business Machines Corporation Sensitive sensor internally mounted shock for a disk drive
US5636090A (en) 1994-10-17 1997-06-03 International Business Machines Corporation Tilt limiting inertial actuator latch for a data storage system
US5555144A (en) 1995-01-12 1996-09-10 Seagate Technology, Inc. Balancing system for a disc drive disc assembly
DE69612925T2 (en) 1995-03-10 2002-03-28 Nippon Petrochemicals Co Ltd METAL / PLASTIC COMPOSITE PLATE, FLOATING ACTUATOR THEREFOR, AND METHOD FOR THEIR PRODUCTION
US5926347A (en) 1995-04-17 1999-07-20 Fujitsu Limited Magnetic disk drive provided with means for pressing head against disk
US5831795A (en) 1995-05-10 1998-11-03 Iomega Corporation Head loading mechanism for a disk drive
GB9517624D0 (en) 1995-08-29 1995-11-01 Heath John S Disk drive
JPH0979263A (en) 1995-09-20 1997-03-25 Hitachi Ltd Bearing device and spindle motor provided with same
US5815349A (en) 1995-09-21 1998-09-29 International Business Machines Corporation Suspension with wire protection which does not impact slider movements
US6084744A (en) 1996-06-06 2000-07-04 Seagate Technology, Inc. Actuator assembly mounted disc snubber
US5801899A (en) 1995-10-06 1998-09-01 Seagate Technology, Inc. Mechanical shock protection for a disc drive
KR100224820B1 (en) 1995-12-15 1999-10-15 윤종용 Damper for an optical disk drive
JP3195213B2 (en) 1995-12-18 2001-08-06 株式会社日立製作所 Rotary information recording / reproducing device
US5742996A (en) 1996-01-03 1998-04-28 International Business Machines Corporation Method of manufacturing a transducer suspension system
JPH09274541A (en) 1996-04-08 1997-10-21 Canon Inc Storage device, control method for the same, storage system and control method for the same
US5822139A (en) 1996-05-10 1998-10-13 Hitachi Electronics Engineering Co., Ltd. Method of detecting thermal asperity error of MR head and magnetic disk certifier using the same method
KR100214308B1 (en) * 1996-05-11 1999-08-02 윤종용 Test apparatus for hard disc driver
KR100188959B1 (en) 1996-07-16 1999-06-01 윤종용 Damper absorbing vibration in optical disk player
US6088192A (en) 1996-08-05 2000-07-11 Quantum Corporation Roll-biased head suspension for reduced track misregistration
US5930079A (en) 1996-08-21 1999-07-27 Magnecomp Corp. Suspension having limited travel flexure for improved loadability
US5844911A (en) 1996-12-12 1998-12-01 Cirrus Logic, Inc. Disc storage system with spare sectors dispersed at a regular interval around a data track to reduced access latency
US6046883A (en) 1996-12-31 2000-04-04 Hutchinson Technology Incorporated Head suspension having a flexure motion limiter
US6185807B1 (en) 1997-01-28 2001-02-13 Seagate Technology Llc Component sealing system
US5781373A (en) 1997-03-14 1998-07-14 Western Digital Corporation Acoustic noise reduction system for a disk drive
KR100208383B1 (en) 1997-06-03 1999-07-15 윤종용 Producting method for capacity changeable hard disk drive
US6201668B1 (en) 1997-07-03 2001-03-13 Seagate Technology Llc Gimbal-level piezoelectric microactuator
JPH1131314A (en) 1997-07-08 1999-02-02 Minebea Co Ltd Magnetic head support
US5969901A (en) 1997-07-31 1999-10-19 International Business Machines Corporation Gasket frame for grounding an actuator flex cable in a disc drive
JPH11162086A (en) 1997-09-24 1999-06-18 Teac Corp Magnetic head supporting device
JPH1196528A (en) 1997-09-25 1999-04-09 Internatl Business Mach Corp <Ibm> Method for washing actuator arm assembly and actuator arm assembly
US6166901A (en) 1998-03-13 2000-12-26 International Business Machines Corporation Vibration dampening system for removable hard disk drive carriers
US6157522A (en) 1998-04-07 2000-12-05 Seagate Technology Llc Suspension-level microactuator
US6088194A (en) 1998-06-12 2000-07-11 International Business Machines Corporation Dual mode actuator
US6229668B1 (en) 1998-07-17 2001-05-08 Samsung Electronics Co., Ltd. Acoustic plug for a hard disk drive
JP4041594B2 (en) * 1998-09-02 2008-01-30 株式会社アドバンテスト Component testing apparatus and chamber opening / closing method
US6154360A (en) 1998-09-24 2000-11-28 Datazone Corporation High impact-resistant data storage subsystem
US6233124B1 (en) 1998-11-18 2001-05-15 Seagate Technology Llc Piezoelectric microactuator suspension assembly with improved stroke length
US6198606B1 (en) 1999-07-28 2001-03-06 Seagate Technology Llc Disc drive actuation system having an injection molded magnetic micro-actuator with metal beam inserts and its method of fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102959369A (en) * 2011-05-20 2013-03-06 SMInstrument株式会社 Device and method for measuring noise of hard disk drive
EP3249391A4 (en) * 2016-03-24 2019-03-20 Cosmecca Korea Co. Ltd. Apparatus for creating artificial atmospheric environment containing fine dust, and system for analyzing fine dust blocking ability of cosmetics by using same

Also Published As

Publication number Publication date
US6446517B1 (en) 2002-09-10
KR20020039240A (en) 2002-05-25
KR100442866B1 (en) 2004-08-02

Similar Documents

Publication Publication Date Title
EP0813187B1 (en) Disk drive with shock detection based on thermoresistive signal from magnetoresistive head
US20060215309A1 (en) Low flying head detection using readback signal amplitude modulation
KR960009887B1 (en) Method and apparatus for cleaning disks
WO2005077043A2 (en) Electrical current measurements at head-disk interface
US6446517B1 (en) Controlled particle deposition in drives and on media for thermal asperity studies
US20150179211A1 (en) Vibration cancellation for data storage
US7009800B2 (en) Method to control flying height between a head and a disk and apparatus thereof
US20080080086A1 (en) Apparatus and method for detecting low flying sliders
US5824920A (en) Apparatus for evaluating magnetic recording medium
KR100712558B1 (en) Apparatus and method for determining compensation of disturbance and disk drive using the same
US7307812B2 (en) Filtering apparatus for disk drive
US20080291564A1 (en) Detecting head-disk contact during off-track operations
US6483657B1 (en) Head flight characterization using thermal asperity detection
Zhang et al. Numerical and experimental study of the particle contamination in a head/media interface
US20230059824A1 (en) Read-write device for an archival data storage library
US20030206358A1 (en) Head instability detection for a data storage device
US7113354B2 (en) Media noise low-fly height test for a disc drive
KR100594230B1 (en) Method of manufacturing head gimbal assemblies, actuators and disk drivers by removing thermal pole-tip protrusion at the spin stand level
EP1505604A2 (en) Actuator having absorption filter and disk drive having the same
Park et al. Investigation of particle generation in a hard disk drive during the start/stop period
US6324890B1 (en) Method of characterizing and screening voice coil motor pivot friction in a low velocity region
US6903886B2 (en) Magnetic transfer apparatus and particle monitoring method
Zhang et al. Predicting air bearing contamination using air flow pattern analysis
KR100574988B1 (en) Apparatus, method and recording-medium for detecting defective disk in hard disk drive
US6959586B2 (en) Evaluating data handling devices by means of a marker impurity

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION