Abstract: A data storage device is disclosed comprising an actuator configured to actuate a head over a disk surface, and a vibration sensor configured to generate a vibration signal (VS). Control circuitry comprising a servo control system having a torque rejection curve (TRC) configured to control the actuator is configured to measure a position error signal (PES) of the head, and measure the VS output by the vibration sensor. A feed-forward compensator is configured based on PES/VS/TRC. While seeking the head across the disk surface, the VS is processed using the feed-forward compensator to generate a feed-forward compensation during a settle interval of the seek, and the actuator is controlled using the feed-forward compensation during the settle interval.

Abstract: A base plate is a portion of a housing of a hard disk drive, and includes a cast base body. The base body includes an inner surface including an inside machined surface that is machined and an inside non-machined surface that is not machined. The base body includes an outer surface including an outside machined surface that is machined and an outside non-machined surface that is not machined. The outside machined surface and the inside non-machined surface overlap in an axial direction that is a direction parallel or substantially parallel to a rotation axis of a disk of the hard disk drive.

Abstract: A control method for data storage system includes obtaining a correlation coefficient corresponding to storage devices using a control device, and adjusting the link speed of one of the storage devices using the control device.

Abstract: A motor may include a motor main body having a turning shaft and a motor case; a magnet that turns together with the turning shaft; a magnetism sensing element that faces the magnet; a circuit board on which the magnetism sensing element is mounted, the circuit board having a signal ground that is connected to a ground terminal of the magnetism sensing element; a circuit board holder that covers the circuit board from a side of the magnet; and a first shield member that covers the circuit board from a side opposite to the magnet. The first shield member and the circuit board holder are each made of an electrically-conductive material, and electrically connected to the signal ground.

Abstract: A data storage system may include multiple data storage devices, such as hard disk drives, a cooling fan, and a sound balancer structure between the fan and the drives. The sound balancer is intentionally positioned where it substantially balances, about the center of rotation of and along at least one axis of a fan-facing storage device, the sound pressure from the fan that impinges upon the fan-facing face of the storage device. This redistribution of the sound pressure suppresses sound pressure-induced torque upon and therefore rotational vibration of the storage device, which in turn enhances the track following capability of the storage device.

Abstract: A sound-attenuation part, such as for use in a rack-mount server, is configured for insertion into an orifice of a backplane to which at least one data storage device is coupled. The sound-attenuation part may include one or more pipes extending from a mounting portion. The sound-attenuation part helps to attenuate acoustic noise, such as from a cooling fan, which might otherwise reach the data storage device, such as through airflow orifices constituent to a backplane that is positioned between the fan and the storage device, while maintaining enough airflow through the backplane for system cooling purposes. Thus, degradation of the head positioning accuracy within the storage device, caused by the forces associated with this acoustic noise, may be reduced.

Abstract: A shock absorption structure includes a receiving portion and at least one shock absorption assembly. The receiving portion is configured to receive a main body of an electronic device. Each shock absorption assembly includes a fixing member, a mounting member, and an elastic member. The fixing member is secured to the receiving portion. The mounting member is mounted to the fixing member and defines a through hole. The elastic member is received in the through hole and is configured to seals a gap between the mounting member and the main body.

Abstract: A data storage assembly including an enclosure including a first set of one or more pockets for receiving a first set of one or more shock mounts configured to be coupled to a data storage device, a cover configured to enclose the enclosure, and a set of one or more retention clips separate from the cover and configured to latch with the first set of one or more pockets to retain the first set of one or more shock mounts.

Abstract: A novel information storage device is disclosed and claimed. The information storage device includes a device housing with a generally rectangular bay to accommodate a disk drive. The generally rectangular bay includes a base portion and a plurality of side portions. The information storage device further includes a damping insert sheet disposed between the disk drive and the base portion. The damping insert sheet has a plurality of elastomeric cushions, for example with a cushion thickness in the range 0.5 mm to 10 mm, and a spanning sheet, for example having a sheet thickness in the range 0.02 mm to 0.35 mm. Each of the plurality of elastomeric cushions is attached to the spanning sheet. Each of the plurality of elastomeric cushions contacts and is compressed between the generally rectangular bay and the disk drive.

Abstract: A first sleeve rotatably extends around a shaft. First and second flanges are fixed to the shaft. A second sleeve extending around the first sleeve is fixed thereto. A first annular member fixed to the second sleeve surrounds the first flange. A second annular member fixed to the second flange surrounds a portion of the second sleeve. A first capillary seal includes a clearance between the first flange and the first annular member. A second capillary seal includes a clearance between the second annular member and the second sleeve. Lubricant is provided in the clearances in the first and second capillary seals. The second annular member and the second sleeve are designed so that the lubricant in the clearance in the second capillary seal can be viewed from a point in a radial position which is outward of the second sleeve as seen in an axial direction.

Abstract: A method for measuring noise of a magnetic head includes setting a plurality of threshold values, applying bias current or voltage to a read element of the magnetic head, applying an external transverse magnetic field to the magnetic head, amplifying output signal from the read element to produce an amplified signal, filtering the amplified signal to produce a filtered signal, generating an enable signal for each threshold value in a predetermined time window by a counting control means with input signals which include the filtered signal and the threshold value, measuring the cumulative time duration of each enable signal, making an amplitude-duration distribution according to the cumulative time durations and the threshold values, calculating a plurality of parameters according to the amplitude-duration distribution and analyzing the parameters with a plurality of predetermined criteria to determine the defects of the magnetic head.

Abstract: Methods and apparatus for vibration cancellation are disclosed. Vibration data from one or more vibration detectors associated with a storage device is collected. The vibration data represents vibrations experienced by the storage device. In response to the vibration data from the one or more vibration detectors, one or more movements for respective ones of one or more counter-vibration actuators to at least partially cancel of the vibrations experienced by the storage device is calculated. The one or more counter-vibration actuators perform the one or more movements.

Abstract: According to one embodiment, a disk storage apparatus includes a disk, a slider, and a controller. The slider includes a head having a write element, a read element, and a head disk interference (HDI) sensor. The controller detects at least abnormality in vibration of the head based on an alternating current component of interference detected by the HDI sensor and an HDI sensor threshold. The controller further measures a characteristic of the HDI sensor and a flying height of the head and adjusts the HDI sensor threshold based on results of the measurements.

Abstract: A disk drive includes a disk drive base, a disk drive top cover, and a head actuator pivotably attached to the disk drive base. The disk drive base and the disk drive top cover together form a disk drive enclosure that encloses the head actuator. At least one read head is attached to the head actuator. A disk drive printed circuit board (PCB) is attached to the disk drive base outside the disk drive enclosure. A motion sensor is attached to the disk drive base outside the disk drive enclosure. The motion sensor is disposed between the disk drive PCB and the disk drive base. The first motion sensor is electrically connected to the disk drive PCB by a plurality of resilient conductive prongs that are preloaded between the disk drive PCB and the first motion sensor.

Abstract: A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (FFWI) method enables data tracks to be written more densely. Alternatively, the FFWI method may reduce the hard error and write inhibit events to improve data storage performance. A concept of virtual tracks enables the FFWI method to be applied to the writing of circular data tracks with non-circular servo tracks, or to the writing of non-circular data tracks with PES data from circular servo tracks—in both cases, improvements to performance and/or storage densities are enabled. The FFWI method may also be applied to the case of both non-circular servo and data tracks.

Abstract: A disk drive is disclosed comprising a servo control system operable to actuate a head over a disk. A disturbance signal is generated in response to a vibration, and the disturbance signal is filtered with a first filter comprising a frequency response to generate a filtered disturbance signal. The filtered disturbance signal is filtered with a model of the servo control system to generate a compensated disturbance signal. An error signal of the servo control system is filtered with a second filter comprising the frequency response to generate a filtered error signal. An adaptation control signal is generated in response to the compensated disturbance signal and the filtered error signal, and an adaptive filter is adapted in response to the adaptation control signal, wherein the adaptive filter filters the disturbance signal to generate feed-forward compensation values applied to the servo control system to compensate for the vibration.

Abstract: According to one embodiment, a disk device includes a disk recording medium, a drive motor, an actuator, a housing which accommodates the recording medium, the drive motor, and the actuator, a printed circuit board opposed to an outer surface of the housing, and an insulating sheet interposed between the printed circuit board and the outer surface of the housing. The insulating sheet has rigidity and elasticity and includes a convex portion. The convex portion has a height not smaller than a clearance between the printed circuit board and the outer surface of the housing and is sandwiched between the printed circuit board and the outer surface of the housing.

Abstract: Improved hard disk drives of the invention comprise a composite housing, wherein the composite housing comprises a base and a cover, wherein at least a portion of the composite housing comprises a laminate of at least one rigid plastic layer and at least one metal coating. Methods for forming the same are also disclosed.

Abstract: A system for peer-to-peer vibration mitigation in a distributing computing system includes a secondary communication interface over which chassis management electronics (e.g., a chassis-level controller) and/or system storage nodes may initiate communications to in order to affect system changes that may decrease vibration-related performance degradation in the system.

Abstract: A storage device includes a processor, a vibration detecting sensor that detects a vibration, a plurality of disk drives, and a disk control device that causes the processor to perform an operation of generating a vibration for a disk drive selected from among the plurality of disk drives so that the generated vibration vibrates in a cycle that is shorter than a cycle of the vibration detected by the vibration detecting sensor.

Abstract: In a storage device provided with a plurality of recording devices, the vibrations which propagate to the recording devices through a board can be reduced with a small number of parts. A storage device equipped with a plurality of recording devices having: a canister equipped with the recording device; a board equipped with a circuit that transmits a signal to the recording device or processes a signal; a chassis equipped with the board and the canister; a plate-like piezoelectric element attached to part of the board; a vibration detection sensor attached to part of the board; and a control unit that controls a drive signal given to the piezoelectric element in accordance with a sensor output of the vibration detection sensor is proposed.

Abstract: A rotating device includes a rotor including a hub to receive a recording disk, and a fixed body including a base that fixedly supports a bearing unit to rotatably support the rotor. The fixed body includes a core having a cylindrical part and salient poles extending in a radial direction, a ring-shaped member having a core holding part that has the core fixed to an outer peripheral surface thereof, a sloping part extending in a direction inclined with respect to a rotational axis of the rotor from a side of the core holding part farther away from the hub, and a support part extending from a side of the sloping part farther away from the hub.

Abstract: In accordance with certain embodiments, a method is provided for sensing linear vibration and rotational vibration. The method includes generating a combined linear vibration and rotational vibration signal. The combined linear vibration and rotational vibration signal may then be processed with an adaptive filter.

Abstract: A novel information storage device is disclosed and claimed. The information storage device includes a device housing with a generally rectangular bay to accommodate a disk drive. The generally rectangular bay includes a base portion and a plurality of side portions. The information storage device further includes a damping insert sheet disposed between the disk drive and the base portion. The damping insert sheet has a plurality of elastomeric cushions, for example with a cushion thickness in the range 0.5 mm to 10 mm, and a spanning sheet, for example having a sheet thickness in the range 0.02 mm to 0.35 mm. Each of the plurality of elastomeric cushions is attached to the spanning sheet. Each of the plurality of elastomeric cushions contacts and is compressed between the generally rectangular bay and the disk drive.

Abstract: In accordance with certain embodiments, a method is provided for sensing linear vibration and rotational vibration. The method includes generating a combined linear vibration and rotational vibration signal. The combined linear vibration and rotational vibration signal may then be processed with an adaptive filter.

Abstract: The present invention discloses a management module for a storage system. The storage system comprises a plurality of hard disk drives and a plurality of fans. The management module comprises a reading unit, for obtaining a plurality of hard disk drive temperature information and a plurality of hard disk drive vibration information of the plurality of hard disk drives, and a controller, coupled to the reading unit, for adjusting rotational speeds of the plurality of fans according to the plurality of hard disk drive temperature information, the plurality of hard disk drive vibration information, and a plurality of fan vibration information of the plurality of fans.

Abstract: Methods and apparatus for vibration cancellation are disclosed. Vibration data from one or more vibration detectors associated with a storage device is collected. The vibration data represents vibrations experienced by the storage device. In response to the vibration data from the one or more vibration detectors, one or more movements for respective ones of one or more counter-vibration actuators to at least partially cancel of the vibrations experienced by the storage device is calculated. The one or more counter-vibration actuators perform the one or more movements.

Abstract: An apparatus for use with a hard disk drive, comprising: a selectable notch filter with a selectable notch frequency; a shock sensor of the hard disk drive, coupled to the selectable notch filter, the shock sensor having at least one resonance frequency; a flip flop coupled to an output of the notch filter and an output of the shock sensor; a calibration logic coupled to an output of the flip flop, wherein an output of the calibration logic is coupled to a selection input of the selectable notch filter.

Abstract: A hard disk drive comprising, a base plate comprising a pin, a top cover, a plurality of magnetic disks, and a spoiler. The spoiler includes a first spring fastener for temporary spring fastening the spoiler on the base plate, and a second spring fastener for resiliently fastening the spoiler when the top cover is attached to the base plate.

Abstract: A disk drive device is provided with a base, a hub on which a recording disk is to be mounted, a bearing unit arranged on the base and configured to rotatably support the hub, and a spindle drive unit configured to rotatably drive the hub. A circumferential ring wall portion is arranged on the outer circumference of the base and formed of a plastic.

Abstract: A disk driving apparatus includes a base member, a hub member, and a fluid bearing unit. The base member has a head movement region on which a head unit is to be mounted such that a head portion of the head unit can be moved along the radial direction of a recording face in a reciprocating manner while facing the recording face of a recording disk to be mounted on the hub member, and a recessed housing portion housing the fluid bearing unit such that it surrounds at least a part of a rotor unit supported by the fluid bearing unit. Furthermore, the base member has an inhibiting wall at a boundary between the head movement region and the recessed housing portion so as to prevent a lubricant fluid from migrating toward the recording disk side.

Abstract: A disk drive device comprises a rotor on which a recording disk is to be mounted and a fixed body rotatably supporting the rotor through a bearing unit. The rotor includes a projecting portion configured to fit into a central hole of the recording disk, a clamper configured to be fixed to the projecting portion, and a seating portion provided radially outward of the projecting portion. The projecting portion and the seating portion are configured such that the seating portion moves with respect to the projecting portion by fixing the clamper to the projecting portion with the recording disk being in between the clamper and the seating portion.

Abstract: A rotating device includes a shaft body that includes a lower rod and an upper rod formed with a retainer hole encircling a part of the lower rod and fixing the lower rod, a bearing body including a shaft encircling member that encircles the shaft body, and freely rotatable relative to the shaft body, a radial dynamic pressure generating groove which is provided in either one of the shaft body and the bearing body and which generates dynamic pressure in a radial direction, a thrust dynamic pressure generating groove which is provided in either one of the shaft body and the bearing body and which generates dynamic pressure in a thrust direction, and a lubrication medium present in a gap between the shaft body and the bearing body.

Abstract: A disk drive including a disk having a top surface, a cover positioned over the disk, and a disk limiter protruding from the cover toward the disk. The disk limiter is configured to contact a portion of the top surface of the disk when the disk is deflected toward the cover, and has a middle portion between two end portions. At least one portion of the disk limiter curves or slopes in a direction away from the disk.

Abstract: A data storage device assembly comprises a data storage device, a shock mount configured to couple to the data storage device, and an enclosure comprising first and second portions. The first enclosure portion may comprise a first pocket defining a first nesting surface, and a first plurality of ribs configured to contact a first portion of the shock mount over an aggregate first surface area that is less than a surface area of the first nesting surface. The second enclosure portion may be configured to mate with the first enclosure portion to enclose the data storage device therebetween. The second enclosure portion may comprise a second pocket defining a second nesting surface and a second plurality of ribs configured to contact a second portion of the shock mount over an aggregate second surface area that is less than a surface area of the second nesting surface.

Abstract: The present invention directs an anti-shock method for head stack assembly which carries a slider for flying on a disk for operation, and the anti-shock method includes: inputting a constant current to a head disk interface sensor which is deposited in the slider; obtaining a changing voltage of the head disk interface sensor, which is changed with the temperature of the head disk interface sensor as the slider is shocked; outputting the changing voltage to a controller with a threshold set therein; if the changing voltage is bigger than the threshold for a specified number of times, the controller is triggered to control the head stack assembly to stop operating and load on a ramp beside the disk; while if the changing voltage is small than the threshold for said specified number of times, the controller is not be triggered and the head stack assembly still operates.

Abstract: In a disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A projecting portion is formed on the upper surface of the base plate having a cylindrical side surface centered along the rotational axis of the motor. A laminated core is formed by laminating magnetic steel sheets and has a ring portion and a plurality of teeth radially extending from the ring portion. The disk drive device has a tubular vibration-deadening ring. The outer surface of the vibration-deadening ring is press-fitted into the ring portion at least at a position, along the motor's rotational axis, closer to the upper surface than to the lower surface of the laminated core; and the inner surface of the vibration-deadening ring is fixed to the side surface of the projecting portion.

Abstract: A method and system for sensing the current applied to the motor of a data storage device and determining whether a shock event has occurred by processing the sensed current levels.

Abstract: The present invention directs an anti-shock method for head stack assembly which carries a slider for flying on a disk for operation, and the anti-shock method includes: inputting a constant current to a head disk interface sensor which is deposited in the slider; obtaining a changing voltage of the head disk interface sensor, which is changed with the temperature of the head disk interface sensor as the slider is shocked; outputting the changing voltage to a controller with a threshold set therein; if the changing voltage is bigger than the threshold for a specified number of times, the controller is triggered to control the head stack assembly to stop operating and load on a ramp beside the disk; while if the changing voltage is small than the threshold for said specified number of times, the controller is not be triggered and the head stack assembly still operates.

Abstract: A disk drive including a disk having a bottom surface and a base having a first surface lying along a first plane and a second surface lying along a second plane positioned substantially parallel to the first plane. The second surface is spaced apart from the first surface and is beneath at least a portion of the bottom surface of the disk. A damper of the disk drive is located on the second surface adjacent the first surface and is configured to contact a portion of the bottom surface of the disk when the disk is deflected toward the first surface.

Abstract: One embodiment relates to an improved enclosure and shock mount for a disk drive. The enclosure and shock mount provide shock and vibration isolation to protect the components of the disk drive. In one embodiment, shock mounts are provided on the disk drive assembly. An enclosure comprises an upper component and a lower component. Retaining features are provided to join the enclosure together and captivate the shock mounts with a desired pre-load.

Abstract: In a storage device provided with a plurality of recording devices, the vibrations which propagate to the recording devices through a board can be reduced with a small number of parts. A storage device equipped with a plurality of recording devices having: a canister equipped with the recording device; a board equipped with a circuit that transmits a signal to the recording device or processes a signal; a chassis equipped with the board and the canister; a plate-like piezoelectric element attached to part of the board; a vibration detection sensor attached to part of the board; and a control unit that controls a drive signal given to the piezoelectric element in accordance with a sensor output of the vibration detection sensor is proposed.

Abstract: In a disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A projecting portion is formed on the upper surface of the base plate having a cylindrical side surface centered along the rotational axis of the motor. A laminated core is formed by laminating magnetic steel sheets and has a ring portion and a plurality of teeth radially extending from the ring portion. The disk drive device has a tubular vibration-deadening ring. The outer surface of the vibration-deadening ring is press-fitted into the ring portion at least at a position, along the motor's rotational axis, closer to the upper surface than to the lower surface of the laminated core; and the inner surface of the vibration-deadening ring is fixed to the side surface of the projecting portion.

Abstract: A method of manufacture of a hard disk drive system includes: providing a base circuit board having a shock sensor and vibration sensors thereon; electrically connecting translational shock detect circuitry directly to the shock sensor for transmission of a translational shock signal; electrically connecting rapid off track shock detection circuitry to the vibration sensors for transmission of a rotation based shock signal; and electrically connecting shock aggregation circuitry to the translational shock signal and the rotation based shock signal for transmission of a composite shock indicator.

Abstract: Described herein is a disk drive having a head stack assembly with an actuator arm that is rotatable about an axis of rotation and has a damping layer disposed on the actuator arm. The damping layer has first and second damping portions, which can include an adhesive or viscoelastic layer. The first damping portion has different damping properties than the second damping portion.

Abstract: As a measure against vibration caused by disturbance due to mass eccentricity of a disc, a conventional disc device has a means to add an auxiliary mass that passively operates. This method has no way to enhance vibration damping effect other than setting the auxiliary mass to be large, and therefore there is a problem that the device becomes large. An auxiliary mass 300 is actively driven by an auxiliary mass driving portion 360. The driving of the auxiliary mass 300 is performed by amplifying a signal corresponding to a force transmitted from a main frame portion 100 to the auxiliary mass 300. This achieves a vibration damping effect using the small auxiliary mass 300 to the same degree as that where the large auxiliary mass is mounted.

Abstract: A periodic rotational vibration check for storage devices to compensate for varying loads is disclosed. A variable representing rotational vibration status is maintained in a rotational vibration log. The variable is processed to determine whether a storage device exhibits a rotational vibration issue. Workload analysis is performed to identify a change to the workloads run on physically separate hardware to resolve the rotational vibration issue and thus eliminate the need for more expensive hardware.

Abstract: A disk drive includes a printed circuit board, an integrated circuit coupled to the printed circuit board, and a disk drive base coupled to the printed circuit board. The disk drive base includes a platform, the platform having a first surface elevated towards the printed circuit board and a second surface further elevated towards the printed circuit board relative to the first surface, the platform being generally aligned with the integrated circuit along an axis normal to the first surface.

Abstract: Described herein is a disk drive having an actuator arm constrained layer damper, for reducing, during use, vibration of the actuator arm. The damper can include a first substantially planar portion that is configured to be positioned on and coupled to a top surface of an actuator arm. The damper can also include a second substantially planar portion extending in a plane transverse to the first planar portion and configured to be coupled to at least one of a side surface of the actuator arm or a surface of an adjacent actuator body.

Abstract: A hub includes first and second side surfaces respectively opposed to inner and outer circumferential surfaces of an upper portion of a magnetic member, and a ceiling surface arranged to interconnect an upper ends of the first and second side surfaces. The adhesive agent is interposed between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and between the upper surface of the magnetic member and the ceiling surface of the hub. Radial distance between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and axial distance between the upper surface of the magnetic member and the ceiling surface of the hub are smaller than radial distance between the outer circumferential surface of the upper portion of the magnetic member and the second side surface of the hub.