Abstract: In order to suppress the occurrence of adhesion between magnetic disks and spacers when the magnetic disks and the spacers are removed from a hard disk drive apparatus in which the magnetic disks and the spacers are installed, a surface roughness Ra of a main surface of a ring-shaped glass spacer to be arranged in contact with a magnetic disk is set to be not larger than 1.0 ?m, and an average inclination R?a of the main surface is set to be at least 0.02.

Abstract: A disk drive assembly including a spindle motor including a hub and a central axis, at least one disk disk having a central opening positioned on the hub and concentric about the central axis, an annular ring member concentric about the central axis, wherein a first portion of the annular ring member is in contact with an outer surface of a top disk of the disk stack, and a disk clamp ring screw adjacent to and in contact with a second portion of the annular ring member, wherein the disk clamp ring screw provides a clamping force to at least partially compress the annular ring member toward the top disk of the disk stack.

Abstract: Disclosed are techniques regarding aspects of implementing client configurable logic within a computer system. The computer system can be a cloud infrastructure. The techniques can include associating signature information with the client configurable logic for various purposes.

Abstract: A portable computing device is disclosed. The portable computing device can take many forms such as a laptop computer, a tablet computer, and so on. The portable computing device can include at least a single piece housing. The single piece housing can be machined from a single billet of material, such as a billet of aluminum. The single piece housing can include ledges with a surface receiving a trim bead and a cover. Corner brackets can be attached to the single piece housing to improve the damage resistance of the housing.

Abstract: A disk clamp for clamping a plurality of disks within a disk drive has a single fastening hole located at its symmetrical center sized to pass the shaft of a screw having a head diameter larger than the fastening hole. The screw fastens the disk clamp to a motor hub supporting the plurality of disks. The disk clamp has a moat around the fastening hole, at a maximum diameter that is smaller than the head diameter of the head on the fastening screw. The moat may be circular, have spike trenches angled toward the fastening hole, or be spiral. The diameter of the spiral moat decreases in a clockwise or counterclockwise direction toward the fastening hole. The midsection of the disk which the screw head covers is biased at a negative angle toward the fastening hole forcing particles generated during assembly toward the fastening hole of the disk clamp.

Abstract: A hard disk drive is described, including a low-profile disk clamp to tied-shaft spindle/spindle motor assembly, in which a clamping nut is threaded onto a threaded spindle sleeve and a stationary shaft screw, or tied-shaft, penetrates through the HDD cover and into a shaft. The disk clamp may include a central opening for centering about the sleeve by way of the outer diameter of the clamping nut mating with the outer diameter of the clamp opening.

Abstract: A magnetic disk drive device for rotary driving a magnetic disk may be provided. The magnetic disk drive device may include a drive motor for rotary driving the magnetic disk. The drive motor may include a motor hub which has motor hub support portion with a screw-type motor hub engaging portion, and a motor hub support surface for supporting the magnetic disk. The magnetic disk drive device may also include a clamp disk including a clamp disk support portion with a screw-type clamp disk engaging portion complementary to the motor hub engaging portion, and a clamp disk support surface for supporting the magnetic disk.

Abstract: Method and apparatus for securing a disc stack to a spindle motor hub. In some embodiments, a disc clamp assembly includes a spring clamp with an annular contact portion which contactingly engages a disc stack and a central aperture through which a hub projection of the spindle motor hub extends. A plurality of interlocking semi-annular shim segments interlock together to form a continuous retention ring assembly which wedges between the spring clamp and a shoulder surface of the spindle motor hub.

Abstract: A spindle motor includes a recording disk and a clamper. A cylindrical portion includes a first screw portion positioned in an outer circumferential portion of the cylindrical portion. The clamper includes an annular raised portion configured to be fitted in a through hole of the recording disk. An inner circumferential portion of the clamper includes a second screw portion configured to be screwed to the first screw portion. At least a portion of the second screw portion is positioned in an inner circumferential portion of the annular raised portion. Each of the first screw portion and the second screw portion includes at least one of a screw groove and a screw thread. An axial position of at least a portion of the second screw portion overlaps with an axial position of the recording disk.

Abstract: A hard disk drive disk clamp is described, in which flex is introduced into the clamp in the radial direction so that, for example, as the disk expands radially at a different rate than the clamp as the temperature increases, less distortion is affected to the disk because the clamp can flex radially. With less disk distortion there is less repeatable runout (RRO) and more precise track following. The disk clamp may have an I-shaped cross-section along the outer portion of the disk clamp, at the contact area with the disk, to provide the radial flex.

Abstract: A disk-rotating motor includes a rotor section including a rotor magnet attached to a rotor frame and a shaft fixed to a center of the rotor frame, and a stator section including a shaft-bearing which bears the shaft, wherein the stator section includes the shaft-bearing, a shaft-bearing housing which holds the shaft-bearing, a thrust plate which bears the shaft in an axis direction, a stator core which is arranged to face the rotor magnet and provided with wire-winding, a core holder which holds the stator core, and a bracket which holds the shaft-bearing housing. The bracket has a projecting part which fixes the shaft-bearing at a central part thereof, an inner diameter part of the shaft-bearing is press-fitted to be tightened to the projecting part, and an outer diameter part of the shaft-bearing housing is adhered to be tightened to an inner diameter part of the core holder.

Abstract: A clamping device for coupling a rotatable component of a machine with a shaft, including a balance hole configured to confine a counterweight. The clamping device includes a circular plate. The circular plate includes at least one fastener hole configured to accept a fastener, and at least one balance hole. The fastener is configured to fasten the clamping device to couple the component with the shaft. The balance hole includes a cavity configured to accept a counterweight. The counterweight is configured to balance the rotational motion of at least the circular plate when the shaft is rotated. Moreover, the cavity is configured to confine the counterweight to an end of the cavity by effects of rotation of the shaft on the counterweight when the shaft is rotated.

Abstract: Provided herein is an apparatus, including a plurality of disk clamp notches spaced about an outer lip of an annular disk clamp; an annular groove in an outer perimeter of a hub; and a mounting point on the hub for at least one disk, wherein the annular disk clamp occupies the annular groove of the hub, clamping the at least one disk onto the hub at the mounting point for the at least one disk.

Abstract: Provided herein is an apparatus, including a plurality of teeth extending from an outer perimeter of an annular disk clamp to an inner perimeter of the annular disk clamp and an annular groove in an outer perimeter of a hub, wherein the plurality of teeth do not engage the annular groove of the hub when the disk clamp is unlocked into an unlocked form, and wherein the plurality of teeth engage the annular groove of the hub when the annular disk clamp is locked into a locked form, clamping at least one disk onto the hub at a mounting point for the at least one disk.

Abstract: Provided herein is an apparatus, including a plurality of disk clamp notches spaced about an outer lip of an annular disk clamp; an annular groove in an outer perimeter of a hub; and a mounting point on the hub for at least one disk, wherein the annular disk clamp occupies the annular groove of the hub, clamping the at least one disk onto the hub at the mounting point for the at least one disk.

Abstract: A disk drive device is provided with a recording disk, a base member, a bearing unit, and a hub member. In a marking step, unbalance information indicating the displacement of the center of gravity of the hub member with respect to the rotation center of the hub member is acquired, and an information mark containing the unbalance information is applied to at least the hub member or the base member. In an installing and adjustment step, the unbalance information is read form the information mark, and the position for installing the recording disk in an outer cylinder part is determined in accordance with the unbalance information so as to install the recording disk on the hub member.

Abstract: In certain embodiments, a hard disk drive includes at least one disk secured to a motor hub with a disk clamp. The disk clamp is positioned radially off-center with respect to the hub to balance a static drive imbalance. In certain embodiments, a method includes radially offsetting a disk clamp to offset a static drive balance.

Abstract: A disk clamp for clamping a plurality of disks within a disk drive has a single fastening hole located at its symmetrical center sized to pass the shaft of a screw having a head diameter larger than the fastening hole. The screw fastens the disk clamp to a motor hub supporting the plurality of disks. The disk clamp has a moat around the fastening hole, at a maximum diameter that is smaller than the head diameter of the head on the fastening screw. The moat may be circular, have spike trenches angled toward the fastening hole, or be spiral. The diameter of the spiral moat decreases in a clockwise or counterclockwise direction toward the fastening hole. The midsection of the disk which the screw head covers is biased at a negative angle toward the fastening hole forcing particles generated during assembly toward the fastening hole of the disk clamp.

Abstract: The disk drive device includes a base member, a hub, a clamper including an end that defines a central hole, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The hub is formed of magnetic material and includes an exterior cylinder portion engaged with an inner circumference of a recording disk and an interior cylinder portion to which the outer diameter portion of the magnet is fixed. The hub is provided with a fitting portion located radially outside of a space in the bearing unit for storing lubricant and configured to be fitted to the end of the clamper that defines the central hole.

Abstract: A disc drive disc stack assembly and a method for forming the disc stack assembly to reduce servo pattern runout. The disc stack assembly includes a number of prewritten discs having a servo pattern and a disc alignment mark. The first step is to place a first disc about a spindle motor hub of the disc drive. The second step is to align a disc alignment mark of the first disc in relation to a direction of a biasing force. The third step is to apply the biasing force to the first disc to engage the first disc against the spindle motor hub. The fourth step is to repeat the first three steps for each remaining disc in the disc stack assembly. The final step is to clamp the prewritten discs with a disc clamp to secure the position of each prewritten disc relative to the spindle motor hub.

Abstract: A disk drive includes a spindle motor attached to a disk drive base. The spindle motor includes a hub that rotates about a spindle rotation axis. An annular disk is mounted on the hub. A clamp is attached to the hub. The clamp has a body portion that is stamped from a metal sheet. The clamp also includes an annular rib that protrudes from the stamped sheet metal body portion towards the annular disk. The annular rib includes an annular contact surface that may be lapped to enhance flatness and that contacts the annular disk. The annular rib also includes inner and outer side walls that are each normal to the annular contact surface.

Abstract: A method of centering a disk of a hard disk drive includes arranging a disk on an upper end portion of a hub on which a plurality of disks are rotatably assembled, and assembling the disk on the hub by vibrating the hub. Accordingly, the disks and/or spacers may be easily assembled on the hub, a time of centering may be relatively much reduced, and a superior centering quality may be obtained.

Abstract: A disk drive motor hub includes a top cylindrical portion defining a longitudinal axis, a middle cylindrical portion proximate the top cylindrical portion, and a bottom cylindrical portion proximate the middle cylindrical portion. The middle cylindrical portion defines an upper mounting surface substantially normal to the longitudinal axis, the upper mounting surface extending radially beyond the top cylindrical portion, and the bottom cylindrical portion defines a lower mounting surface substantially normal to the longitudinal axis, the lower mounting surface extending radially beyond the middle cylindrical portion.

Abstract: A spin stand is disclosed comprising a spindle motor having a rotor. A first disk clamp is operable to clamp a first disk to the rotor, and a second disk clamp is operable to clamp a second disk to the rotor. An actuator is operable to clamp the second disk clamp in order to clamp the second disk to the rotor after the first disk has been clamped to the rotor.

Abstract: According to one embodiment, an information processing terminal may include a partition wall dividing an inner room of a housing into a first space and a second space. The information processing terminal may further include a support member subdividing the second space into a third space and a fourth space with a ventilation path defined therebetween, the support member supporting the partition wall. Further, the information processing terminal may include a power supply located in the third space defined by the support member, and a mother board configured to allow a processing unit to be mounted thereon in the first space. A cooling fan may be provided in the information processing terminal to have a rotating blade that extends across the first space and the second space defined by the partition wall.

Abstract: A disk drive includes a spindle motor attached to a disk drive base. The spindle motor includes a hub that rotates about a spindle rotation axis. An annular disk is mounted on the hub. A clamp is attached to the hub. The clamp has a body portion that is stamped from a metal sheet. The clamp also includes an annular rib that protrudes from the stamped sheet metal body portion towards the annular disk. The annular rib includes an annular contact surface that may be lapped to enhance flatness and that contacts the annular disk. The annular rib also includes inner and outer side walls that are each normal to the annular contact surface.

Abstract: An electronic device includes a main body, two positioning members, a cover, at least one positioning post, and at least one latching member. The main body includes a first casing, a second casing, and a HDD. The second casing defines an opening, from which the HDD is capable of being placed into and removed from the electronic device. The positioning members protrude from the first casing. The cover is rotatably connected to the positioning members. When the cover is rotatable to be received in the opening, the cover and the positioning members cooperatively define a receiving space to receive the HDD. Each of the at least one positioning post perpendicular extends from one of the positioning members. Each of the at least one latching member is rotatably connected to the cover and includes a hook capable of engaging with at least one of the positioning post to latch the cover.

Abstract: A mounting frame for hard disk includes a frame and latching members, the frame includes two opposite frame arms including a wall and supporting bases laterally extending from one wall toward the other wall, the wall defines receiving grooves to form wall sections, and a compartment is defined between opposite wall sections. The compartments respectively receive hard disks, the supporting bases support the hard disks and secure with the hard disks to prevent the hard disks from moving along a first direction; Each latching member engages with the opposite receiving grooves, separate adjacent hard disks, and prevent hard disk from sliding along a second direction perpendicular with the first direction.

Abstract: A hard disk drive has an information recording medium that is rotationally driven for recording and/or reproducing information and a rotor hub that supports the information recording medium. The rotor hub has a flat mounting surface disposed in an outer circumferential portion thereof and on which the information recording medium is mounted so as to contact an edge portion of the mounting surface. The mounting surface is made of stainless steel containing a machineability improving additive, except for selenium and tellurium, for improving the machineability of the mounting surface. At least one of the edge portion or a portion of the mounting surface in the vicinity of the edge portion contains surface pores formed by component particles of the additive falling from the mounting surface. Each of the pores has a length less than 10 ?m in a circumferential direction of the mounting surface.

Abstract: A sleeve and a hub are fixed to each other, and then the sleeve and the hub are gripped and rotated around a central axis, during which cutting is performed over the inner peripheral surface of the sleeve and a flange surface of the hub. Thus, the flange surface can be finished accurately such that the flange surface is normal to the central axis and the inner peripheral surface of the sleeve.

Abstract: A disk drive. The disk drive includes a motor, a hub coupled to a spindle shaft of the motor, at least two disks each having a center hole and being coupled to the hub, and a spacer having a center hole. The spacer is disposed around the hub such that the hub is disposed within the center hole of the spacer; and, the spacer is sandwiched between and in contact with the two disks to define spacing between the disks. The spacer includes at least two conductive rings and the conductive rings are secured between the two disks. The spacer also includes a damping sheet configured to absorb vibration between the conductive rings, and a conductive ring-shaped spring having a spring characteristic in a radial direction of the disks to make a diameter variable. Moreover, the conductive ring-shaped spring is in contact with both of the two conductive rings.

Abstract: In a method for manufacturing a rotor hub for use in a spindle motor, free-cutting stainless steel is used as a material of the rotor hub. A slug of free-cutting stainless steel is subjected to a plastic working to form a disk mounting portion and a cylindrical surface positioned radially inwardly of the disk mounting portion. Then, a cylindrical disk fitting surface is formed by machining substantially the entirety of the cylindrical surface. The rotor hub contains A-type inclusions appearing in a cross section taken along a center axis of the disk mounting portion. The A-type inclusions are oriented in directions different than the center axis.

Abstract: A disk device with disk contamination control having a spindle for rotating at least one disk. A spindle hub located on the spindle. A disk clamp for clamping the at least one disk on the hub. A magnetic clamp seal magnetically and removably attached to the disk clamp wherein the magnetic clamp seal encapsulates disk contaminants between the clamp and the clamp seal. The magnetic clamp seal magnetically collects metallic contaminants within a sealed housing.

Abstract: An improved disk stack assembly for a hard disk drive (HDD) includes a generally cylindrical hub with flange having a downward sloping conical flange surface. The conical flange surface is defined between a radially inner circular ridge and a radially outer circular edge. The bottom disk in the stack is in contact with the flange inner circular ridge. The disk stack assembly also includes a disk clamp with a contact surface having a contact rim that is in contact with either the radially inner portion of the top disk in the stack or a spacer ring. The clamp contact rim is located at approximately the same radial distance from the hub's central cylindrical axis as the flange circular ridge so that the clamping force is applied to the disks close to the area where the disk stack is supported on the conical flange surface.

Abstract: The application discloses an assembly tool for installing a disc clamp on a spindle hub. In the illustrated embodiments, the assembly tool includes a head including an inner portion, an intermediate portion and an outer portion configured to install a disc clamp on a spindle motor assembly. In the illustrated embodiments, the inner portion includes a raised portion and datum surface that interface with the spindle hub to align the spindle hub for installation of the disc clamp.

Abstract: A spindle motor includes a spindle motor hub that supports one or more disks, and has a contact area reduction portion that minimizes the area of contact between the hub and a disk when the disk is mounted to the hub. The spindle motor hub includes a hub body having a cylindrical sidewall that includes a contact section around which the disk extends and a non-contact section. The non-contact section is constituted by the contact area reduction portion. An outer diameter of the cylindrical hub body at the contact section is greater than an outer diameter of the cylindrical hub body at the contact area reduction portion of the non-contact section.

Abstract: A disk device is presented that includes a drive motor which has a rotatable hub fitted with a recording medium and rotates the recording medium, and a disk-shaped clamper attached to the hub to hold the recording medium. The clamper has a center aperture formed on a central axis of rotation of the drive motor and at least one positioning hole eccentric to the central axis of rotation. The clamper is fixed to the hub by a fixing screw driven into the hub through the center aperture. The hub has a support surface opposed to the clamper and an annular engaging groove formed in the support surface to be coaxial with the central axis of rotation and opposed to the positioning hole, the engaging groove being configured to be engaged with a fixing pin which is passed through the positioning hole.

Abstract: Additives that inhibit the passage of oil across oil-air interfaces in disk drives and enable the use of the lower viscosity oil in disk drives are disclosed. Mass transfer of oil from the bulk liquid oil into the vapor phase takes place by oil molecules evaporating from the oil-air interface, or collections of oil molecules being ejected from the oil-air interface as aerosol. The invention reduces mass transfer across the oil-air interface through the use of oil-soluble surfactants.

Abstract: A method of compensating for an imbalance of a hard disk drive includes biasing a plurality of disks in one direction with respect to a rotational shaft of a spindle motor hub, measuring an amount of imbalance of the plurality of disks with respect to the rotational shaft of the spindle motor hub, and compensating the amount of imbalance of the plurality of disks by hitting the hard disk drive in the opposite direction to the one direction in which the plurality of disks are biased to reduce the amount of imbalance with an amount of impact predetermined based on a measured imbalance amount.

Abstract: A method of centering a disk of a hard disk drive includes arranging a disk on an upper end portion of a hub on which a plurality of disks are rotatably assembled, and assembling the disk on the hub by vibrating the hub. Accordingly, the disks and/or spacers may be easily assembled on the hub, a time of centering may be relatively much reduced, and a superior centering quality may be obtained.

Abstract: A hard disk drive includes a hub on which a plurality of disks are rotatably assembled, and a spacer assembled to the hub to be alternately arranged with the disks to separate the disks and having at least one area of an inner wall surface that elastically contacts and is pressed against an outer wall surface of the hub for centering with respect to the hub.

Abstract: A disk drive. The disk drive includes a motor, a hub coupled to a spindle shaft of the motor, at least two disks each having a center hole and being coupled to the hub, and a spacer having a center hole. The spacer is disposed around the hub such that the hub is disposed within the center hole of the spacer; and, the spacer is sandwiched between and in contact with the two disks to define spacing between the disks. The spacer includes at least two conductive rings and the conductive rings are secured between the two disks. The spacer also includes a damping sheet configured to absorb vibration between the conductive rings, and a conductive ring-shaped spring having a spring characteristic in a radial direction of the disks to make a diameter variable. Moreover, the conductive ring-shaped spring is in contact with both of the two conductive rings.

Abstract: A fixing apparatus for securing an HDD, includes a carrier containing the HDD and a plurality of fixtures to secure the HDD in the carrier. The carrier includes a bottom frame and two opposite sidewalls connected to two opposite edges of the bottom frame. Each fixture includes a post and a cushion. The cushions are fixed in the sidewalls and abut against two opposite sides of the HDD. The posts are extended through the cushions and inserted into the two opposite sides of the HDD to hold the HDD spaced apart from the bottom frame and the sidewalls of the carrier.

Abstract: In a wet-type friction material, a ring-shaped friction material substrate is compressed and fixed on a surface of a core metal by heat-pressing by a manufacturing metal mold. At the same time, a taper of an angle ? corresponding to a taper at an outer peripheral side of an upper mold is provided on an outer peripheral side of the ring-shaped friction material substrate. Thus, the taper is formed such that a thickness in a radial direction of the ring-shaped friction material substrate becomes smaller from a middle point toward an outer peripheral edge.

Abstract: A method of balancing a disk pack assembly is disclosed. The disk pack assembly comprises a plurality of components including a plurality of disks coupled to a hub of a spindle motor with at least one disk spacer between the disks. The method comprises the steps of rotating a first biasing arm about a pivot to apply a first biasing force to a first component of the disk pack assembly, and moving a second biasing arm linearly to apply a second biasing force to a second component of the disk pack assembly.

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 improved disk stack assembly for a hard disk drive (HDD) includes a generally cylindrical hub with flange having a downward sloping conical flange surface. The conical flange surface is defined between a radially inner circular ridge and a radially outer circular edge. The bottom disk in the stack is in contact with the flange inner circular ridge. The disk stack assembly also includes a disk clamp with a contact surface having a contact rim that is in contact with either the radially inner portion of the top disk in the stack or a spacer ring. The clamp contact rim is located at approximately the same radial distance from the hub's central cylindrical axis as the flange circular ridge so that the clamping force is applied to the disks close to the area where the disk stack is supported on the conical flange surface.

Abstract: A disk apparatus includes a hub having a disk inserting portion having a cylindrical plane in the outer part of one end and a disk receiving portion having a flat part and being pivotably supported, a head having an inner hole through which the disk inserting portion is fitted, facing toward one face of a disk, levitating and scanning above the disk and reading a signal recorded on the disk or recording a signal on the disk, the disk being held by the disk receiving portion, and a clamp unit holding the disk with the disk receiving portion. In this case, the disk receiving portion has an inclined or declined plane. Thus, the amount and direction of deformation of the disk, which is caused by clamping, are defined, and obtaining a stable amount of head levitation independently of temperature changes can prevent the occurrence of a distortion of the disk.

Abstract: Disk clamp including a disk clamp base and a disk clamp platform. Disk pack including at least one disk coupled between disk clamp and spindle motor. Hard disk drive including disk pack mounted on disk base. Manufacturing methods for disk clamp base, disk clamp platform, disk pack and hard disk drive, and these items as products of their manufacturing processes.

Abstract: A robotic end-effector for high-speed precision alignment and assembly of components has a holding device operable for temporarily holding a second component. The second component is to be aligned and assembled to a first component. The robotic end-effector has a course alignment device operable for locating the holding device with respect to a locating feature that is coupled with the first component. The robotic end-effector has a retractor operable for disengaging the course alignment device from the locating feature. The robotic end-effector has a moveable base whereby lateral compliance is provided for the holding device, enabling motion of the second component with respect to the first component, thereby enabling fine alignment of the second component with the first component when the second component touches the first component.