WO1994022135B1 - Ultra-small form factor disk drive apparatus - Google Patents
Ultra-small form factor disk drive apparatusInfo
- Publication number
- WO1994022135B1 WO1994022135B1 PCT/US1994/003106 US9403106W WO9422135B1 WO 1994022135 B1 WO1994022135 B1 WO 1994022135B1 US 9403106 W US9403106 W US 9403106W WO 9422135 B1 WO9422135 B1 WO 9422135B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- data
- disk drive
- latch
- head
- Prior art date
Links
- 230000035939 shock Effects 0.000 claims abstract 40
- 239000004020 conductor Substances 0.000 claims 5
- 230000003068 static Effects 0.000 claims 4
- 238000011084 recovery Methods 0.000 claims 3
- 239000011800 void material Substances 0.000 claims 3
- 238000003780 insertion Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
- 230000000977 initiatory Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000036316 preload Effects 0.000 abstract 1
Abstract
An ultra-small form factor disk drive system (12) of length about 86 mm, width about 54 mm and height about 13.5 mm or less is based on a 4.8 cm (1.89 in) diameter disk (20). The disk drive system is adapted to fit in an enclosure which is adapted to mate with and fit into a double high PCMCIA connector/slot and/or a triple high PCMCIA connector/slot. For the double high PCMCIA connector/slot, the height of the disk drive enclosure does not exceed 10.5 mm. The system may include a flying head and flexure assembly (34) incorporating a high offset and high preload head for improved head height control and increased recording density across the surface of the disk, a spindle motor (110) integral with the base plate (112) of the drive, a mechanical latch (230) for positive head actuator parking, and mechanical shock detection means (310) to prevent data corruption. The disk drive system can withstand 200 g shocks while operating.
Claims
1. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm, apparatus for preventing data corruption on a disk of a disk drive due to a mechanical shock experienced by said disk drive while writing data to a selected data track on said disk by passing a write- current to a write head disposed on a head arm of an actuator, said apparatus comprising: mechanical shock sensing means for sensing mechanical shock having a magnitude exceeding a predetermined threshold and producing a shock-present signal in response thereto, said mechanical shock sensing means including a beam having a first end, a second end and a piezoelectric film strain sensor attached along a length of said beam, said second end having a mass of between 0.01 gm and 1.0 gm attached thereto, an electrical output of said piezoelectric film strain sensor carried on a pair of conductors; write-disable means, responsive to said shock-present signal, for interrupting the write current to the write head; interrupted-data identifying means, responsive to said shock-present signal, for identifying interrupted data being written at the time said shock-present signal indicates the presence of the mechanical shock; and recovery means, responsive to said interrupted-data identifying means, for repositioning the write head over the selected track and for rewriting said interrupted data.
2. The apparatus of claim 1 wherein said first end of said mechanical shock sensing means is fixed along a mounting axis parallel to an axis of rotation of the 51
actuator so as to permit rotational movement of said beam about said mounting axis in response to a shock applied to the disk drive about said axis of rotation.
3. The apparatus of claim 2 wherein said mechanical shock sensing means comprises an accelerometer.
4. The apparatus of claim 3 wherein said mechanical shock sensing means comprises a cantilever-beam accelerometer.
5. The apparatus of claim 3 wherein said mechanical shock sensing means comprises a single-beam cantilever-beam accelerometer.
6. The apparatus of claim 3 wherein said mechanical shock sensing means comprises a dual-beam cantilever-beam accelerometer having a beam positioned on an axis of rotation of the head arm.
7. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm, a method for preventing data corruption on a disk of a disk drive caused by mechanical shock experienced by said disk drive while writing data to an original data track with a data head, said method including the steps of: sensing a mechanical shock having a magnitude exceeding a predetermined threshold with a mechanical shock sensor including a beam having a first end, a second end and a piezoelectric film strain sensor attached along a length of said beam, said second end 52
having a mass of between 0.01 gm and 1.0 gm attached thereto, an electrical output of said piezoelectric film strain sensor carried on a pair of conductors; interrupting the write current to the data head of said disk drive during said mechanical shock; storing information identifying interrupted data being written when said write- current is interrupted; repositioning the data head to the original data track; and rewriting said interrupted data.
8. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm, a method for preventing data corruption on a disk of a disk drive caused by a mechanical shock experienced by said disk drive while writing data to a data track with a data head, said method including the steps of: temporarily storing in a buffer a block of data to be written to the disk; initiating a disk-write operation; temporarily storing a shock indicator signal in a selected storage location if a mechanical shock having a magnitude exceeding a predetermined threshold is sensed, said shock indicator signal derived from a mechanical shock sensor including a beam having a first end, a second end and a piezoelectric film strain sensor attached along a length of said beam, said second end having a mass of between 0.01 gm and 1.0 gm attached thereto, an electrical output of said piezoelectric film strain sensor carried on a pair of conductors; interrupting the write current to the data head if said mechanical shock is sensed; 53
examining said selected storage location for said shock indicator signal after completion of said disk- write operation; and repositioning the data head to the data track and rewriting said block of data if said shock indicator signal is present.
9. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm, said disk drive system comprising: at least one disk surface capable of being rotated about a first axis; a voice coil actuator capable of rotary motion about a second axis parallel to said first axis; a head arm mounted on said voice coil actuator; a write head mounted on said head arm and positioned over said disk surface by said voice coil actuator; said write head adapted to write information to a track of said disk surface in response to a write-current passed through said write head; mechanical shock sensing means for sensing a mechanical shock having a magnitude exceeding a predetermined threshold and producing a shock-present signal in response thereto, said mechanical shock sensing means including a beam having a first end, a second end and a piezoelectric film strain sensor attached along a length of said beam, said second end having a mass of between 0.01 gm and 1.0 gm attached thereto, an electrical output of said piezoelectric film strain sensor carried on a pair of conductors; write disable means, responsive to said shock-present signal, for interrupting said write-current to said write head; interrupted-data identifying means, responsive to said shock-present signal, for identifying interrupted data being written at the time said shock-present signal indicates the presence of a mechanical shock exceeding said predetermined threshold; and recovery means for repositioning said write head over said track and rewriting said interrupted data if said shock-present signal indicates the presence of a mechanical shock exceeding said predetermined threshold.
10. A disk drive system according to claim 9 wherein said first end of said beam is mounted along a third axis parallel to said first axis so as to permit rotational movement of said beam about said third axis in response to a shock applied to the disk drive about said first axis.
11. A disk drive system according to claim 9 comprising a printed circuit board contained within the housing wherein said mechanical shock sensing means is mounted to said printed circuit board.
12. A disk drive system according to claim 11 wherein said mechanical shock sensing means is mounted within a void in said printed circuit board.
13. A disk drive system comprising: at least one disk surface capable of being rotated about a first axis; a voice coil actuator capable of rotary motion about a second axis parallel to said first axis; a head arm mounted on said voice coil actuator; 55
a write head mounted on said head arm and positioned over said disk surface by said voice coil actuator; said write head adapted to write information to a track of said disk surface in response to a write-current passed through said write head; a housing within which is mounted a printed circuit board; mechanical shock sensing means for sensing a mechanical shock having a magnitude exceeding a predetermined threshold and producing a shock-present signal in response thereto, said mechanical shock sensing means including a beam having a first end, a second end and a piezoelectric film strain sensor attached along a length of said beam, said second end having a mass of between 0.01 gm and 1.0 gm attached thereto, an electrical output of said piezoelectric film strain sensor carried on a pair of conductors; said printed circuit board containing a void; said first end of said mechanical shock sensing means mounted to said printed circuit board and said second end extending into said void; write disable means, responsive to said shock-present signal, for interrupting said write-current to said write head; interrupted- data identifying means, responsive to said shock-present signal, for identifying interrupted data being written at the time said shock-present signal indicates the presence of a mechanical shock exceeding said predetermined threshold; and recovery means for repositioning said write head over said track and rewriting said interrupted data if said shock-present signal indicates the presence of a mechanical shock exceeding said predetermined threshold.
14. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a 56
width of no more than about 54 mm and a height of no more than about 13.5 mm and including an actuator mounted at a first pivot point, said actuator including a first radially- extending arm including a data head mounted thereon and a second radially-extending arm having an actuator coil mounted thereon, said first pivot point positioned with respect to a data disk so that said data head may be positioned over a data zone and a landing zone on said data disk, a static bi-stable mechanical disk drive actuator latch comprising: a latch member mounted at a second pivot point, said latch member rotatable between an open position defined by an opened-position stop and a closed position defined by a closed-position stop, said latch member including first and second arms radially extending from said pivot point, said first arm including a hook located proximate to a distal end thereof and having a first magnetic mass mounted thereon, said second arm including a latch coil and a second magnetic mass mounted thereon, and having a tang extending in a direction generally towards said actuator; said second radially extending arm of said actuator including a protuberance extending in a direction generally towards said tang, and a tip nestable in said hook; said first and second pivot points positioned with respect to one another such that said tang will engage said protuberance at a predetermined position when said actuator is rotating so as to place said data head over said landing zone and such that said tip will be captured by said hook when said actuator is positioned such that said data head is over said landing zone and said latch member is in said closed position; and a magnet positioned proximately to said actuator coil, said latch coil, and said first and second magnetic masses; wherein said magnet has a magnetic field strength selected such that, said magnet is positioned such that, and said first and second magnetic masses are sized such that, the rotational position of said actuator may be controlled by passing electric current through 57
said actuator coil, a magnetic force of attraction between said magnet and said first magnetic mass will hold said latch member at said closed position, passing an electric current through said latch coil will move said latch member to said open position, and a magnetic force of attraction between said magnet and said second magnetic mass will hold said latch member at said open position after the electric current is turned off.
15. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm and including an actuator mounted at a first pivot point, said actuator including a first radially- extending arm including at least one data head mounted thereon and a second radially- extending arm having an actuator coil mounted thereon, said first pivot point positioned with respect to a data disk so that said data head may he positioned over a data zone and a landing zone on said data disk by passing current through said actuator coil, apparatus for latching said disk drive actuator, comprising: bi-stable mechanical latch means for latching said disk drive actuator, said bi¬ stable mechanical latch means having a first unlatched state in which said actuator is free to move over said data zone, and a second latched state in which said actuator is confined over said landing zone, said bi-stable mechanical latch means including force-balancing means for statically maintaining said bi-stable mechanical latch means in either one of said first and said second states without application of electrical current; unpowered latching means, magnetically responsive to said at least one data head being positioned over said landing zone, for switching said bi-stable mechanical latch means from said first unlatched state into said second latched state; and 58
releasing means, responsive to an electrical release signal, for switching said bi¬ stable mechanical latch means from said second latched state into said first unlatched state.
16. In a rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system including a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm and including an actuator mounted at a first pivot point, said actuator including a first radially- extending arm including at least one data head mounted thereon and a second radially- extending arm having an actuator coil mounted thereon, said first pivot point positioned with respect to a data disk so that said data head may be positioned over a data zone and a landing zone on said data disk by passing an electrical current through said actuator coil, a static bi¬ stable mechanical disk drive actuator latch comprising: a latch member mounted at a second pivot point, said latch member rotatable between an open position defined by an opened-position stop and a closed position defined by a closed-position stop, said latch member including first and second arms radially extending from said pivot point, said first arm including a hook located proximate to a distal end thereof and having a first soft magnetic mass mounted thereon, said second arm including a latch coil and a second soft magnetic mass mounted thereon, and having a tang extending in a direction generally towards said actuator; said second radially extending arm of said actuator including a protuberance extending in a direction generally towards said tang, and a tip nestable in said hook; said first and second pivot points positioned with respect to one another such that said tang will contact said protuberance at a predetermined position when said actuator is rotating so as to place said data head over said landing zone and such that said contact will cause said latch member to rotate from said open position to said closed position and said tip 59
will be captured by said hook when said actuator is positioned such that said data head is over said landing zone and said latch member is in said closed position, and a magnet positioned proximately to said actuator coil, said latch coil, and said first and second soft magnetic masses, wherein the rotational position of said actuator may be controlled by passing an electric current through said actuator coil, said magnet has a field strength selected such that, said magnet is positioned such that, and said first and second soft magnetic masses are sized such that, a magnetic force of attraction between said magnet and said first soft magnetic mass will hold said latch member at said closed position, passing an electric release current through said latch coil will move said latch member to said open position, and a magnetic force of attraction between said magnet and said second soft magnetic mass will hold said latch member at said open position after said electric release current is turned off
17. In a disk drive mechanism including an actuator mounted at a first pivot point, said actuator including a first radially-extending arm including a data head mounted thereon and a second radially-extending arm having an actuator coil mounted thereon, said first pivot point positioned with respect to a data disk so that said data head may be positioned over a data zone and a landing zone on said data disk, a static bi-stable mechanical disk drive actuator latch comprising: a latch member mounted at a second pivot point, said latch member rotatable between an open position defined by an opened-position stop and a closed position defined by a closed-position stop, said latch member including first and second arms radially extending from said pivot point, said first arm including a hook located proximate to a distal end thereof and having a first soft magnetic mass mounted thereon, said second arm including a latch coil 60
and a second soft magnetic mass mounted thereon, and having a tang extending in a direction generally towards said actuator; said second radially extending arm of said actuator including a protuberance extending in a direction generally towards said tang, and a tip nestable in said hook; said first and second pivot points positioned with respect to one another such that said tang will engage said protuberance at a predetermined position when said actuator is rotating so as to place said data head over said landing zone and such that said tip will be captured by said hook when said actuator is positioned such that said data head is over said landing zone and said latch member is in said closed position; and a magnet positioned proximately to said actuator coil, said latch coil, and said first and second soft magnetic masses; wherein the rotational position of said actuator may be controlled by passing an electric current through said actuator coil, said magnet has a field strength selected such that, said magnet is positioned such that, and said first and second soft magnetic masses are sized such that, a magnetic force of attraction between said magnet and said first soft magnetic mass will hold said latch member at said closed position, passing an electric release current through said latch coil will move said latch member to said open position, and a magnetic force of attraction between said magnet and said second soft magnetic mass will hold said latch member at said open position after said electric release current is turned off.
18. In a disk drive mechanism including an actuator mounted at a first pivot point, said actuator including a first radially-extending arm including a data head mounted thereon and a second radially-extending arm having an actuator coil mounted thereon, said first pivot point positioned with respect to a data disk so that said data head may be positioned 61
over a data zone and a landing zone on said data disk, a static bi-stable mechanical disk drive actuator latch comprising: a latch member mounted at a second pivot point, said latch member rotatable between an open position defined by an opened-position stop and a closed position defined by a closed-position stop, said latch member including first and second arms radially extending from said pivot point, said first arm including a hook located proximate to a distal end thereof and having a first soft magnetic mass mounted thereon,, said second arm including a latch coil and a second soft magnetic mass mounted thereon, and having a tang extending in a direction generally towards said actuator; said second radially extending arm of said actuator including a protuberance extending in a direction generally towards said tang, and a tip nestable in said hook; said first and second pivot points positioned with respect to one another such that said tang will engage said protuberance at a predetermined position to cause rotation of said latch member from said open position to said closed position when said actuator is rotating so as to place said data head over said landing zone and such that said tip will be captured by said hook when said actuator is positioned such that said data head is over said landing zone and said latch member is in said closed position; and a magnet positioned proximately to said actuator coil, said latch coil, and said first and second soft magnetic masses; wherein said magnet has a magnetic field strength selected such that, said magnet is positioned such that, and said first and second soft magnetic masses are sized such that, a magnetic force of attraction between said magnet and said first soft magnetic mass will hold said latch member at said closed position, passing an electric release current through said latch coil will move said latch member to said open position, and a magnetic force of attraction 62
between said magnet and said second soft magnetic mass will hold said latch member at said open position after said electric release current is turned off.
19 A rigid rotating disk drive system for removable attachment to a computer system comprising: a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm; a PCMCIA connector disposed horizontally from said housing; the rigid rotating disk drive interfaceable to the computer system through a triple high PCMCIA connector/slot.
20. A rigid rotating disk drive system for removable attachment to a computer system comprising: a housing having a width of no more than about 54 mm and a height of no more than about 10.5 mm; a PCMCIA connector disposed horizontally from said housing; the rigid rotating disk drive interfaceable to the computer system through a double high PCMCIA connector/slot.
21. A rigid rotating disk drive system for removable attachment to a computer system through a PCMCIA-type interface, said system comprising: a housing having a width of no more than about 54 mm and a height of no more than about 13.5 mm; and an integral spindle motor base plate assembly for a disk drive comprising: 63
a base plate including a recessed portion located therein, said recessed portion defined by a wall; a spindle shaft centrally mounted in said recessed portion of said base plate, said shaft having a lower portion and an upper portion; a stator fixedly mounted on said lower portion of said shaft and fully contained within said recessed portion, said stator having an outer diameter; an upper bearing and a lower bearing mounted on said upper portion of said shaft; an integral rotor assembly rotatably mounted onto said upper and lower bearings, an upper portion of said rotor assembly adapted for mounting at least one disk thereto, and a lower portion of said rotor assembly in the form of a cylindrical band co-axial with said upper portion of said rotor assembly, said lower portion of said rotor assembly having an annular magnet mounted thereon, and extending downward into a region defined by said outer diameter of said stator and said wall defining said recessed portion of said base plate, said annular magnet contained fully within said recessed portion; at least one disk mounted on said upper portion of said rotor assembly; and a disk clamp mounted over said at least one disk and fastened to said upper portion rotor assembly by a fastening means substantially disposed at an axis of rotation of said rotor assembly for holding said disk in a fixed relationship with respect to said rotor assembly.
Statement Under Article 19(1)
Claims 19-20 (formerly claims 1-2)
US A 5,113,297 (Yoshida) shows a disk drive having a disk cartridge that can b inserted and removed from a driving device. There is no indication that the entire disk drive system, including the driving device, is smaller than the size recited in claims 19-20. There is also no indication that Yoshida' s system is adapted for connection to a PCMCIA connector (figure 3B shows a slidable connector shutter, not a PCMCIA connector), or that Yoshida' s system would fit in a double-height or triple-height PCMCIA slot. Since Yoshida shows a removable disk cartridge with a slidable connector shutter, it teaches against the disk drive system recited in the claims.
US A 5,251,082 (Elliot et al.) shows a disk drive with a PC board plug for insertion into a PC motherboard. Although Elliot describes the plug as being 'compatible" with the PCMCIA standard, there is no description of a PCMCIA connector disposed horizontally from the housing. Since Elliot shows a PC board plug for direct insertion into a PC motherboard, it teaches against the disk drive system recited in the claims.
As neither Yoshida nor Elliot shows a PCMCIA connector disposed as recited in the claims, and in fact teach against that recital, creating an entire disk drive system having the recited size, with the recited PCMCIA connection, or fitting into a recited PCMCIA slot, would have involved an inventive step.
Claim 21 (formerly claim 3)
There is similarly no indication that the disk drive motor of US A 5,047,677 (Mineta et al.) would fit into a housing having dimensions recited in the claim.
Claims 14-15 (formerly claims 4-5) and new claims 6-8
There is no indication that the indicators of , the indicators of US A 5,208,713 (Lindsay et al.) or US A 5,313,354 (Sampietro et al.) would fit into a housing having dimensions recited in the claims.
Claims 14-18 recite an unpowered latching means that is magnetically responsive to the data head being positioned over the landing zone.
Lindsay shows (figure 4C) that latch coil 48 must be energized in one way or another to effect the unlatch and "arm for latch" operations (see col. 7, lines 24-40, and abstract).
Claim 15 recites a device that requires no power, apart from that used to position the heads on the actuator over the landing zone, to cause the latch to latch. Lindsay requires power to "arm" his latch. Once Lindsay's latch is armed, it appears that it will operate without additional power, but it will not so operate if it is not first armed, and power to arm the latch is required for operation. The claimed device can operate to secure the head actuator preventing damage to the data portion of the disk surface even in a complete power failure. 65
Claims 1-13 (formerly claims 6-18)
There is no indication that the disk drive of US A 5,235,472 (Smith) or the sensor of US A 4,522,072 (Sulouff et al.) would fit into a housing having dimensions recited in the claims.
Smith teaches a complex sensor that is mounted at an angle to a disk drive, so as to achieve three separate sensors for the X, Y and Z directions from the drive. Smith's sensor comprises a complex sandwich assembly that must be disposed in an electrically shielded unit and rigidly mounted to the drive's circuit board, and requires several sensor signal leads to produce several signals that must be processed. Sulouff teaches a planar sensor that has complex circuitry.
Claims 1-13 recite a sensor that produces only a single signal, and hence requires only a single chain of signal processing, an advantage when size is a constraint. Claims 1-13 also recite a sensor that is a piezoelectric film sensor disposed on a beam with a weight at one end. The recited film sensor inherently requires less volume than the more complex sensors of Smith and Sulouff. Moreover, because the sensor of the present invention is positioned along a beam with a weight at one end, it is inherently more responsive to shock in various directions than is a single piezoelectric crystal sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU69641/94A AU6964194A (en) | 1993-03-23 | 1994-03-22 | Ultra-small form factor disk drive apparatus |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3545893A | 1993-03-23 | 1993-03-23 | |
| US08/035,458 | 1993-03-23 | ||
| US19336194A | 1994-02-04 | 1994-02-04 | |
| US08/193,361 | 1994-02-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994022135A1 WO1994022135A1 (en) | 1994-09-29 |
| WO1994022135B1 true WO1994022135B1 (en) | 1994-10-27 |
Family
ID=26712142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/003106 WO1994022135A1 (en) | 1993-03-23 | 1994-03-22 | Ultra-small form factor disk drive apparatus |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU6964194A (en) |
| WO (1) | WO1994022135A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896574A (en) * | 1996-10-09 | 1999-04-20 | International Business Machines Corporation | Wireless modem with a supplemental power source |
| KR100255641B1 (en) * | 1997-07-31 | 2000-05-01 | 윤종용 | Head flying height control method and apparatus for hard disk drive |
| EP1120788A4 (en) * | 1999-06-18 | 2003-03-12 | Citizen Watch Co Ltd | Card type magnetic recording device |
| JP2001014782A (en) * | 1999-06-30 | 2001-01-19 | Hitachi Ltd | Magnetic disk device |
| KR100486293B1 (en) * | 2002-12-27 | 2005-04-29 | 삼성전자주식회사 | Optic disc drive |
| CN111046578B (en) * | 2019-12-24 | 2023-07-14 | 北京航天控制仪器研究所 | Method for building output model of quartz vibrating beam accelerometer |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4522072A (en) * | 1983-04-22 | 1985-06-11 | Insouth Microsystems, Inc. | Electromechanical transducer strain sensor arrangement and construction |
| JPH071617B2 (en) * | 1986-06-30 | 1995-01-11 | 株式会社東芝 | Magnetic disk device and magnetic head control method for magnetic disk device |
| US4862298A (en) * | 1988-03-11 | 1989-08-29 | Magnetic Peripherals Inc. | Shock load detection device |
| JP2586305Y2 (en) * | 1988-12-29 | 1998-12-02 | 株式会社三協精機製作所 | Magnetic disk drive motor |
| US5264975A (en) * | 1989-09-19 | 1993-11-23 | International Business Machines Corporation | Magnetic disk storage device with the base provided by an electronic module substrate |
| JPH0636522Y2 (en) * | 1989-11-22 | 1994-09-21 | ティアツク株式会社 | Disk cartridge erroneous insertion prevention mechanism |
| US5177650A (en) * | 1990-11-09 | 1993-01-05 | Seagate Technology, Inc. | Disc drive assembly with improved communications and reduced contamination risk |
| US5208713A (en) * | 1991-05-07 | 1993-05-04 | Quantum Corporation | Bistable magnetic/electromagnetic latch for disk file actuator |
| US5251082A (en) * | 1991-06-13 | 1993-10-05 | Elliott Timothy J | Miniaturized disk file pluggable into a card terminal |
| US5235472A (en) * | 1991-10-18 | 1993-08-10 | Seagate Technology, Inc. | Apparatus for sensing operating shock on a disk drive |
| US5313354A (en) * | 1992-11-12 | 1994-05-17 | Seagate Technology, Inc. | Disc drive latch housing having improved vibration dampening |
-
1994
- 1994-03-22 AU AU69641/94A patent/AU6964194A/en not_active Abandoned
- 1994-03-22 WO PCT/US1994/003106 patent/WO1994022135A1/en active Application Filing
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