Abstract: A disk drive with DTR media and method of assembly is described. The method may include aligning a discrete track recording (DTR) track pattern center on a DTR disk with a rotational center of a spindle hub and mounting the DTR disk on the spindle hub to minimize eccentricity. After the DTR disk is mounted to the spindle hub, it may be rotated to a designed rotational speed and the mass imbalance of the rotating DTR disk/spindle hub may be measured. The mass imbalance may be mitigated using a mechanical component such as a counter weight coupled to a spindle rotatable component, for example, the spindle hub, a spacer assembly, a clamp assembly, etc. The method may mitigate the eccentricity associated with DTR media and minimize run-out due to the mass imbalance of an otherwise rotated DTR disk/hub aligned for eccentricity correction.

Abstract: A fluid dynamic bearing is provided. A structure in which a shaft member and an annular member fitted about the shaft member are rotatably supported by a bearing member and an annular member on the bearing member has a fifth gap for storing a lubricating fluid and supplying it to a second gap below the annular member on the shaft member and a third gap around its outer periphery through a fourth gap. The fourth and fifth gaps are tapered to produce a capillary drawing force toward the third and second gaps, so that the lubricating fluid may be supplied effectively from the fifth gap to the second and third gaps. This makes it possible to suppress any sudden formation of a reduced pressure upon exposure to impact or vibration to prevent the leakage of any lubricating fluid caused by the generation of bubbles, while making up for the loss of any lubricating fluid by vaporization.

Abstract: A recording disk cartridge includes a plurality of flexible recording disk media, a rotational member, and a cartridge case. The rotational member holds the recording disk media so that the recording disk media simultaneously rotate. The cartridge case provides a rotationally free housing for the recording disk media and the rotational member. The cartridge case has an opening to allow an end portion of the rotational member to be exposed to an outside of the cartridge case. The recording disk cartridge has an elastic member which provides a force to thrust the rotational member toward the opening.

Abstract: A clamping device that fixes a disc onto a spindle motor that rotates the disc includes a clamp ring that is layered on the disc, and a screw that fixes the clamp ring onto the spindle motor, and has a seating surface that inclines relative to a plane perpendicular to an axis of the screw, the seating surface of the screw having an inclined angle greater than a plane that contacts the seating surface of the screw of the clamp ring before the clamp ring is fixed by the screw.

Abstract: A disk clamping apparatus and method for securing a data storage disk to a spindle motor of a hard disk drive. The disk clamping apparatus includes a flange formed on an outer periphery of a hub of the spindle motor and a clamp. The clamp is provided with a central hollow portion to receive an upper end portion of the hub, and includes a hook for snapping onto the flange along an inner periphery thereof and a pressing portion contacted with an upper surface of the disk for pressing the disk in a vertical direction along an outer periphery thereof. When the clamp is being coupled to the hub, the clamp is deformed so that the hook snaps on the flange, resulting in the pressing portion pressing the disk in the vertical direction, using a resilient force produced from a deformation of the clamp. The clamp further includes a cap formed around the hook to cover the hub.

Abstract: Embodiments of the invention provide a magnetic disk drive promoting even higher densities, greater capacities, and further reduction in size, while relaxing component accuracy requirements. In one embodiment, the magnetic disk drive includes a magnetic disk receiving member and a magnetic disk holding member, a magnetic disk being rotatably held with the magnetic disk clamped therebetween. The receiving member makes a line contact with a surface of the magnetic disk on a circumference of a circle formed around a rotational axis of the magnetic disk.

Abstract: Provided are a disk spacer for an information storage device and a spindle motor assembly employing the disk spacer. The spindle motor assembly includes a spindle motor, one or more data storage disks mounted around the spindle motor, a disk clamp coupled to the spindle motor and fixing the disk clamp, and a disk spacer mounted around the spindle motor and supporting the disk, wherein the disk spacer has a groove of a predetermined depth formed along an outer peripheral surface thereof, which does not contact the disks, and the groove is tapered as it is closer to an inner peripheral surface of the disk spacer away from the outer peripheral surface of the disk spacer. Since impacts and vibrations delivered to the disks are scattered by the disk spacer, the wobble of the disk due to the impacts and vibrations is reduced.

Abstract: A disk holder for an off-line servo-track writer is installed at a driving motor of the off-line servo-track writer in a state in which a plurality of disks for information storage are assembled to the disk holder. The disk holder has a flange for supporting the plurality of disks, a mounting portion to be joined to the driving motor is provided at one side of the flange, and a hub is provided at the other side of the flange. A space into which air flows is formed in the hub, and the plurality of disks and a plurality of spacers for maintaining a gap between the plurality of disks are assembled around the outer circumference of the hub. A plurality of pressing members are installed at the hub to move back and forth in a radial direction of the hub.

Abstract: A disk spacer interposed between a plurality of disks that are rotatably installed on a spindle motor and has a ring shape to maintain an interval between the disks. The center of an inner circle defined by an inner circumferential surface of the disk spacer is not congruous with the center of an outer circle defined by an outer circumferential surface thereof to produce mass eccentricity.

Abstract: A spindle motor, which rotates a plurality of data storage disks in a hard disk drive, the spindle motor including: a shaft; an inner hub rotatably installed on an outer periphery of the shaft; and a hub assembly, which includes: an outer hub detachably coupled to an outer periphery of the inner hub, the outer hub shaped such that a plurality of disks and at least one spacer for maintaining an interval between adjacent disks of the plurality of disks can be secured to an outer periphery of the outer hub; and a fastening member coupled to a top portion of the outer hub and fixing the outer hub to the inner hub. The outer hub assembly to which the plurality of disks are secured can be mounted on an off-line servo-track writer, and can also be attached as is to the spindle motor after servo-track writing is completed.

Abstract: A fluid dynamic bearing with a modified air-gap is disclosed. One embodiment provides a clamp adjacent to the fluid dynamic bearing, the clamp for clamping at least one disk with respect to the fluid dynamic bearing. In addition, a cap is also provided proximal to a shaft of the fluid dynamic bearing, the cap having an outer end proximal to the clamp such that an air-gap is provided between the outer end of the cap and the clamp.

Abstract: A magnetic medium stack assembly includes a hub, a magnetic medium, and a clamp fixing the magnetic medium to the hub. The hub and clamp include engaging flange members that enable the hub and clamp to lock together without the use of external hardware or an adhesive. The clamp applies a substantially uniform compressive force on the magnetic medium, which helps reduce circumferential acceleration.

Abstract: Provided is a clamping device of a spindle motor including a body, a stopper, a weight, and an elastic member. The stopper is coupled to the body. The weight is coupled to the stopper. The elastic member elastically supports the stopper.

Abstract: A clamping system includes a stack of storage media discs that includes an annular outer disc surface. A clamp includes a clamp surface that faces the outer disc surface. A ring is disposed between the clamp surface and the outer disc surface. The ring has a crested ring face with a circular crest line that contacts the clamp surface.

Abstract: A hard disk drive (HDD) having a spindle motor, at least one data storage disk, a disk clamp fastened to the spindle motor and fixing the disk to the spindle motor, and at least one disk spacer mounted on the spindle motor to support the disk. The disk spacer includes a ring-shaped disk spacer body fitted around an outer circumference of the spindle motor with at least one surface contacting the disk, a first groove on the surface of the spacer body contacting the disk, a second groove on the surface of the spacer body contacting the disk to extend along both sides of the first groove, and a damping member between the spacer body and the disk to reduce vibrations of the disk, seated in the first groove in a normal state and compressed by the disk, a portion of which is deformed and accommodated in the second groove.

Abstract: The present invention provides a hub/clamp assembly for holding a disk hub in position when the hub is spin in a high speed. The hub/clamp assembly comprises of: a removable disk hub having a shaft for stacking a plurality of storage disks, a flange portion integrally attached to one end of the shaft, and an extension shaft integrally attached to the flange portion opposite to the shaft; wherein the axes of the shaft, the flange portion, and the extension shaft are in alignment; and a hub clamp housing having a housing with side walls and top and bottom surfaces, and a clamp means disposed within the cavity formed within the housing. The present invention also provides a multi-disk servowriter for writing servo information onto multiple storage disks at the same time.

Abstract: A disc centering device includes a base plate, a chuck which is installed on the base plate, a hub unit which is detachably engaged to the chuck and receives discs to be stacked, disc pushers which are slidably provided outside the hub unit and include corresponding pressure members which center the discs by pushing circumferences of the discs, and a driving unit which slides the disc pushers simultaneously. Accordingly, as the accuracy of centering the discs is improved, discs with data recorded thereon having a uniform quality can be obtained. Additionally, vibration of a rotation body can be minimized due to the simple configuration the disc centering device. Therefore, in view of the simplified maintenance and repair of the disc centering device, the productivity and manufacturability of HDDs can be improved.

Abstract: A mounting apparatus for holding a storage device (10) defining apertures (122) in sidewalls (12) thereof includes a bracket (20), and a cover (30) rotatably attached to the bracket, and a pair of thumbscrews (40) securing the cover to the bracket. The bracket includes a first side plate (23) with a plurality of tips (231) engaging in the apertures, and a second side plate (24). The second side plate defines a cutout (25) and a pair threaded holes (247) therein. The cover is pivotally attached to the second plate and covers the cutout. The cover includes a plurality of tips (33) to engage in corresponding apertures of the storage device, and a pair of through holes (37). The thumbscrews extend through the through holes and engage in the threaded holes.

Abstract: A BLDC motor includes a rotor having a permanent magnet attached to an inner circumferential surface thereof, a stator that forms a magnetic field to rotate the rotor and a bracket provided in a lower portion of the rotor to support the stator, where the bracket includes a strength reinforcement part. The BLDC motor has an improved structure which may enhance strength of the bracket. The BLDC motor may prevent moisture penetration.

Abstract: A clamp device that clamps a disc onto a spindle motor that rotates the disc includes a clamp ring stacked on the disc and clamps the disc onto the spindle motor, a screw that fixes the clamp ring onto the spindle motor, and an axial force adjuster that nonlinearly changes a relationship between a tightening force of the screw and an axial force actually applied to the disc, and includes an elastic part that has a spring constant smaller than that of the clamp ring.

Abstract: A primer is applied to a radially outer surface of a sleeve unit, and an adhesive is applied to an inner circumferential surface of a base defining a through hole in the base prior to the sleeve unit is inserted into the through hole. The sleeve unit includes a flange portion extending over entire circumference of the sleeve unit. The flange portion is used as a mark for applying the primer to the radially outer surface of the sleeve unit, and prevents the primer from flowing along the radially outer surface and entering into a bearing mechanism of the motor. Through the configuration, a base and a sleeve unit are firmly fixed to each other without degrading a bearing characteristic.

Abstract: A disk spacer located on a rotator of a spindle motor to allow an additional disk to be mounted on the spindle motor, the disk spacer including a screw hole formed in a central part of the disk spacer to allow a clamping screw to pass through, a first disk pressing part located in a lower surface of an outer circumference part of the disk spacer to press surroundings of a central hole of a first disk directly mounted on the rotator, and a second disk supporter located on an upper surface of the outer circumference part of the disk spacer to support surroundings of a central hole of a second disk located above the first disk, and a hard disk drive having the disk spacer.

Abstract: An apparatus separating a resonance excitation response of a first disc from a resonance excitation response of second disc, the apparatus includes spindle motor with a spindle motor hub supporting the first disc, a disc spacer communicating with the first disc supporting a second disc and a clamp ring attached to this on the motor hub imparting a clamping force on the second disc to form a disc pack. Separation of resonance response between the first disc and the second disc results from maintaining a distinction between an amount of extension of mass and stiffness of each disc available for resonance excitation beyond respective outboard clamping points of the disc spacer. Separation of resonance assures resonance of the first disc is dissipated by a damping of the spindle motor, as well as resonance of the second disc is dissipated by the damping of the spindle motor.

Abstract: Apparatuses and methods for improving disk pack balancing are provided including methods for centering disk clamps. One method to center a clamp is to modify the construction of the disk clamp to incorporate a centering flange located on the inner diameter and near an upper surface of the clamp. The hub assembly may also be modified to include an upper chamfer and an annular groove or notch to reduce the amount of potential surface contact between the centering flange of the disk and the outer diameter of the hub, thereby minimizing contamination caused by contact between the disk clamp and hub. Another method for improving disk pack balancing as well as general disk pack robustness is use of a modified hub assembly construction wherein an over-molded section includes a plurality of centering tabs that precisely align spacers and data storage disks within the disk pack.

Abstract: A disc drive apparatus mounted with an improved clamping mechanism for driving a disc to rotate is composed of a rotor and a stator, which supports the rotor rotatable freely. The rotor includes a rotor yoke, a clamping section for clamping down a disc on the rotor yoke, a boss and a shaft. The rotor yoke is constituted by a regulating surface for regulating a position in an axial direction of the disc clamped down on the rotor yoke by the clamping section and a center hole. The boss is constituted by a base section in disciform having a through hole and an outer peripheral wall section in an annular shape extending outward around the base section with perpendicularly intersecting to the base section. The boss fastens the rotor yoke by engaging the center hole of the rotor yoke with an outer circumferential surface of the outer peripheral wall section at the bottom. The shaft is fixed to the boss by being inserted into the through hole of the boss.

Abstract: A disk clamp for securing data storage disks to the hub of a spindle motor in a hard disk drive has a stress distributing cavity to reduce the stress concentration on disk under the screw locations. The cavity may comprise a single, completely circumferential annular slot located in the perimeter side wall of the clamp, or a series of smaller cavities that are angularly aligned with each screw in the perimeter of the clamp. In the case of adding a series of small stress distribution cavities, the load distribution is modulated to higher harmonic components, thus reducing the peak-to-valley value of reaction force on the contact ring by about 20% to 50%.

Abstract: A disk drive includes a base, a spindle motor attached to the base, the spindle motor including a hub having hub apertures, a plurality of disks on the spindle motor and including a first and a second disk, a disk spacer between the first and second disks, and a disk clamp. The disk spacer has a plurality of spacer through apertures. Each of the spacer through apertures extend radially through the disk spacer. The disk clamp has clamp through apertures adjacent to an inner diameter of the disk clamp. Each of the clamp through apertures extend longitudinally through the disk clamp. The clamp through apertures, the hub apertures and the spacer through apertures are aligned for allowing airflow to pass through the apertures when the disks are rotating.

Abstract: A robust spindle motor is provided having added shock resistance for fluid containment. In an aspect, a high-speed centrifugal capillary seal contains a fluid reservoir extending between similarly rotatable components. Fluid is recirculated through the motor and substantially around a counterplate. Proper axial positioning of motor components and stiffness is maintained in motors supporting heavy loads such as a disk drive memory system having a weighty disc pack. In an aspect, two separate thrust surfaces provide oppositely directed axial forces acting on motor components. In an aspect, a single thrust plate that is comparatively small is utilized, reducing power consumption. Also, a thrust bearing situated inboard of a capillary seal forms a comparatively small diameter thrust plate gap. The comparatively small diameter thrust plate gap increases efficiency and characteristics including surface flatness, run out and perpendicularity are improved.

Abstract: An assembly for coupling a disk to a spindle includes an annular spacer ring adapted to engage the disk and an annular clamp. The spacer ring is constructed at least in part of a plastic material. The clamp is constructed of a material having a modulus and stiffness greater than that of the spacer ring.

Abstract: Steps for clamping storage media to a motor hub to form a data storage device include; securing the disc clamp with a mounting tool, which subsequently expands a central mounting aperture of the disc clamp for assembly of the disc clamp to the motor hub. Upon eschewing the mounting tool from the disc clamp, the motor hub constrains the disc clamp to develop a clamp force that is imparted on the storage media by an annular rib of the disc clamp to clamp the disc to the motor hub. The disc clamp is generally disc shaped and includes a central mounting aperture and a peripheral portion that includes the annular rib extending in a radial direction from the central mounting aperture. The annular rib pressingly engages the storage media to clamp storage media to the motor hub.

Abstract: A disk drive includes a disk clamp for clamping a plurality of disks to a spindle motor, and a disk spacer positioned between first and second disks. The first disk has a plurality of first disk through apertures adjacent its inner diameter. The first disk through apertures are circumferentially spaced-apart and extend longitudinally through the first disk. The disk spacer has a plurality of spacer apertures that are circumferentially spaced-apart and extend longitudinally through a portion of a thickness of the disk spacer. The disk clamp is adjacent to the first disk and has a plurality of clamp through apertures adjacent an outer diameter of the disk clamp. The clamp through apertures are circumferentially spaced-apart and extend longitudinally through the disk clamp. The first disk through apertures, the spacer apertures, and the clamp through apertures are aligned for allowing airflow to pass through when the plurality of disks is rotating.

Abstract: A disc centering device includes a base plate, a chuck which is installed on the base plate, a hub unit which is detachably engaged to the chuck and in which a plurality of discs are stacked, disc pushers which are slidably provided outside the hub unit, and include corresponding plate springs which center the discs by pushing circumferences of the discs, supporting units which support the corresponding plate springs with respect to the disc pushers so as to reinforce a restoring force of the plate springs after a disc centering of the discs, and a driving unit which slides the disc pushers simultaneously. Accordingly, even though the disc centering is continuously performed, a centering value can be maintained within a desired range (deviation), and deformation of discs can be prevented.

Abstract: A disk clamp is provided for securing one or more data storage disks to a disk drive without the need for screws. A preloading device is also provided for installing the disk clamp and removing the disk clamp after installation. The preloading device applies a load to the clamp to deflect the clamp, and allows a retaining ring to be positioned between the disk clamp and the hub of the disk drive. Preloading the disk clamp helps to reduce disk drive contamination, potential damage to the motor hub, and improves reworkability of the disk drive. The preloading device can be incorporated within a manually manipulated preloading device, or within an automated assembly process in which the preloading device is incorporated. Methods are also provided for clamp preloading and clamp installation.

Abstract: A disk clamp of a hard disk drive installs a disk firmly for storing data using a spindle motor of the hard disk drive. The disk clamp includes a vertical pressing portion, formed along an edge portion of the disk, for pressing an upper surface of the disk in a vertical direction, a plurality of horizontal pressing portions, formed inside the vertical pressing portion to protrude downward and be inserted between an outer circumference of the spindle motor and an inner circumference of the disk, to press an inner circumferential surface of the disk outwardly, and a plurality of screw coupling holes formed inside the horizontal pressing portion, through which screws are inserted to be coupled to an upper end portion of the spindle motor. The horizontal pressing portions are formed in at least three positions in a circumferential direction at regular intervals or at four positions at an interval of approximately 90° in the circumferential direction.

Abstract: A disk clamp for securing data storage disks to the hub of a spindle motor in a hard disk drive has a circumferential rib protruding from a lower surface of the disk clamp. A complementary recess is formed in the hub of the spindle motor for closely receiving the rib on the disk clamp. The inner diameter of the rib and the outer diameter of the recess are closely toleranced to provide a very precise centering feature for mounting and aligning the disk clamp with respect to the hub and spindle motor. This design reduces the complexity of the tooling and fixtures required to complete the assembly and the overall part cost is reduced.

Abstract: An apparatus and method for balancing a disk are described. A balance ring may be a circular band for placement along the inner diameter of a disk. On the outer diameter of the balance ring, one or more clamp structures may extend outward to attach the balance ring to the inner diameter of a disk. The inner diameter of the balance ring may have a number of protuberances that, when trimmed, establish a new rotational center of the disk/balance ring coincident with the mass center. The disk and balancing ring may be mounted on a disk balancing system to determine a mass center and trim the protuberances, accordingly, to establish adjust the rotational center of the disk/balance ring to be coincident with the mass center. The protuberances may be trimmed using, for example, laser energy.

Abstract: There is provided a disk drive including a disk drive base and a spindle motor hub. The disk drive further includes first and second disks disposed about the spindle motor hub. The disk drive further includes a disk spacer disposed about the spindle motor hub between the first and second disks. The disk spacer includes a circumferential disk spacer opening. The disk drive including a plate body extending between the first and second disks for modifying air flow adjacent the first and second disks during operation of the disk drive, and an inner edge extending from the plate body and disposed towards the hub, the inner edge being disposed within the disk spacer opening overlapping the disk spacer in a direction parallel to the axis of rotation for mitigating against contact between the inner edge and the first and second disks.

Abstract: An aspect of the invention can be regarded as a disk drive that includes a disk drive base and a spindle motor hub rotatably coupled to the disk drive base. The disk drive further includes a first disk disposed about the spindle motor hub and having a first disk stiffness. The disk drive further includes a second disk disposed about the spindle motor hub and having a second disk stiffness different than the first disk stiffness. According to another aspect of the present invention, the second disk has a second disk thickness different than a first disk thickness. According to another aspect of the present invention, the second disk is formed of a second material having a second material stiffness different than a first material stiffness.

Abstract: A magnetic disk apparatus can achieve reduced thickness by reducing thickness of the clamp, improved shock resistance achieved by an increase of clamping force, and reduced rotating synchronous deviation due to such as camber or undulation of a disk generated by eccentricity of the disk depressing section, a disk receiving surface of the spindle hub and the disk. That is, on a circumference more inwards than a portion in contact with an outside diameter of screw head section and clamp, clamp has displacement section in a screw axial direction throughout the whole circumference with a contact section set as a reference.

Abstract: A disk spacer coupled to an outer circumference of a hub of a spindle motor in a hard disk drive to support at least one data storage disk, wherein at least one groove generating flow of air toward an outer circumference of the disk is formed at an outer circumferential surface of the spacer. The groove is formed to be deeper from an arbitrary position on the outer circumferential surface of the spacer in a direction opposite to a rotation direction of the disk, and has a blade surface extending from the deepest position to the outer circumferential surface. The blade surface is substantially perpendicular to a tangential line at the outer circumferential surface of the spacer.

Abstract: A disc balancing device and a method thereof. The disc balancing device includes a disc assembly having a driving source, and a disc rotatably disposed at the driving source, a displacement measurement unit measuring vibration in the rotation of the disc assembly, a phase angle measurement unit measuring a phase angle from a reference point of the disc assembly in the rotation of the disc assembly, an operation/control unit calculating an eccentric mass and an eccentric position of the disc assembly, by using the biased vibration measured in the displacement measurement unit and the phase angle measured in the phase angle measurement unit, and a laser cutter tracking and laser-cutting the side portion of the disc corresponding to the eccentric position according to the information from the operation/control unit, whereby the eccentric mass of the disc assembly is balanced to reduce vibration in the rotation.

Abstract: A brushless DC motor includes a fixed portion and a rotor. The rotor includes a shaft and a top engaging face. The shaft is rotatably held by the fixed portion. The top engaging face is located on a top side of the rotor. The rotor further includes at least one protruded engaging portion on the top engaging face. A carrier such as a tray or the like is fixedly coupled with the at least one protruded engaging portion. A compartment is defined in the rotor by the at least one protruded engaging portion. A filling material may be filled into the compartment for adjusting rotational balance of the rotor.

Abstract: A glass ring 2, which includes an inner peripheral surface 4, an outer peripheral surface 3 and annular contacting surfaces 5 for contact with magnetic disks and is formed in a ring shape having a rectangular vertical cross-section, is fabricated. The glass ring has at least the contacting surfaces 5 lapped and then etched to have a desired surface roughness so as to improve a surface property. Additionally, the roughened surfaces of the etched contacting surface have an electrically conductive film 6 formed thereon, providing a spacer ring.

Abstract: A hard disk balancing apparatus for a hard disk drive including an eccentricity detection unit to detect an eccentricity amount and an eccentricity position of the hard disk with respect to a rotation axis of a spindle motor for rotating the hard disk as an origin, and a pushing unit to push a circumference of the hard disk in the eccentricity position and to move the hard disk on the rotation axis of the spindle motor according to the eccentricity amount. Here, the eccentricity detection unit includes a detection sensor to detect the rotation axis of the spindle motor, and is placed coaxially with the rotation axis of the spindle motor, and at least three distance sensors that are separated from the detection sensor to be at least farther than a radius of the hard disk and to measure a distance between one point on the outer circumference of the hard disk and themselves.

Abstract: A spring disk clamp is provided for securing one or more data storage disks to a disk drive without the need for screws. The disk clamp incorporates an angled surface defining the central opening of the clamp which is positioned adjacent a sloping surface of the hub. An external axial load applied to the clamp deflects the clamp, and allows a retaining member to be wedged between the clamp and the hub. Stabilizing features such as O-rings and the like are also eliminated as the clamp of the invention provides both radial and axial stabilization to the disk pack in its mounting to the hub.

Abstract: A spindle motor including a rotatable hub is provided on a case, and a disk is fitted on an outer periphery of the hub. A disk damper is fixed to an end portion of the hub to hold the disk on the hub. The disk damper integrally includes a clamp portion fixed to the end portion of the hub to hold a centre portion of the disk, and a substantially annular straightening portion extending outwards from the clamp portion in a radial direction and facing to a surface of the disk with a predetermined gap.

Abstract: A disk chuck which centers and clamps data storage disks during a disk formatting process. The disk chuck is designed to clamp or unclamp the disks at the same time. The disk chuck includes a hollow main shaft which orderly fits and seats the disks thereon and a piston which is situated in the hollow main shaft so as to axially move in the hollow main shaft in opposite directions. A clamping shaft is axially received in the hollow main shaft and coupled to the piston so as to move along with the piston in the same direction to clamp or unclamp the disks seated on the hollow main shaft. An upper end of the clamping shaft having a disk clamping part extends to project beyond an upper end of the hollow main shaft.

Abstract: A system for exchanging digital data among a plurality of hand-held computer devices. Digital signals are written by a first hand-held device to a mini-cartridge that mini-cartridge is inter-operable among a class of hand-held devices, each of which is equipped with a mini-disk drive. A common digital data format is employed to further facilitate exchange of data between devices.

Abstract: An apparatus for assembling components of a data storage system. Assembly components are housed by a component storage member removably coupled to the frame of the apparatus for supporting a plurality of component stacks for automated assembly. The apparatus includes an assembly coupled to the component storage member for sequentially unloading components and assembling the unloaded components in a data storage system. The apparatus is adapted for high capacity, production and speed assembly.

Abstract: A single plate hydrodynamic bearing motor comprising an integrated hub and shaft assembly. The hub is formed of molded plastic and at least one disk is affixed to the hub.