A base member includes a projection having a cylindrical shape and projecting in an axial direction and a component placement part. The projection and the component placement part are adjacent to each other via a curved surface part having a first curved surface and a second curved surface. The first curved surface and the second curved surface have a diameter increasing toward the component placement part in the axial direction. The second curved surface is located closer to a side of the component placement part than the first curved surface in the axial direction.

A removable disk clamp assembly for mounting disk media on a motor-driven spindle of a magnetic read-write device includes a disk clamp and a mechanism for generating a predetermined force to press the disk media to a flange of the spindle such that the predetermined force can be repeatedly overcome by an applied counterforce to remove the disk clamp from engagement with a hub of the spindle. Such a mechanism may include a spring-loaded removable disk clamp assembly or a magnetic removable disk clamp assembly, and whereby a vacuum-driven chuck may be employed for disk and clamp handling purposes, all of which are suitable for implementation and use in a read-write device configured for use in an archival data storage system library such as in a cleanroom storage system.

A magnetic tunneling junction (MTJ) structure is described. The MJT structure includes a stress modulating layer on a first electrode layer, where a material of the stress modulating layer is different from a material of the first electrode layer. The MJT structure further includes a MTJ material stack on the stress modulating layer. And the MJT structure further includes a second electrode layer on the MTJ material stack. The stress modulating layer reduces crystal growth defects and interfacial defects during annealing and improve the interface lattice epitaxy. This will improve device performance.

A disk clamp for a hard disk drive, configured to clamp disk media to a spindle, includes multiple protrusions extending from a surface of a bottom side and configured to contact a disk medium at multiple contact positions in response to application of a clamping load. The protrusions may be annular protrusions circumscribing a disk clamp hub, where the height of an inner protrusion may be less than the height of an outer protrusion to inhibit coning of the top disk medium, and the protrusions may be positioned so that an equivalent contact radius corresponding to contact radii of the inner and outer annular protrusions is at a position halfway between the inner and outer diameters of the disk spacers to inhibit coning of the middle disk media.

According to one embodiment, a disk device includes a housing with a bottom wall, magnetic disks supported on a hub of a motor, a printed circuit board provided on an outer surface of the bottom wall, and a wiring board attached on the outer surface of the bottom wall. The bottom wall includes a recess formed in the outer surface, a step located on border between the outer surface and the recess, and through holes opened to the recess. The wiring board includes one end portion disposed in the recess and connection pads on the one end portion, connected to lead wires of a coil. An adhesive is filled into the recess and the through holes, and covers the one end and a solder joint and seals the through holes.

A removable disk clamp assembly for mounting disk media on a motor-driven spindle of a magnetic read-write device includes a disk clamp and a mechanism for generating a predetermined force to press the disk media to a flange of the spindle such that the predetermined force can be repeatedly overcome by an applied counterforce to remove the disk clamp from engagement with a hub of the spindle. Such a mechanism may include a spring-loaded removable disk clamp assembly or a magnetic removable disk clamp assembly, and whereby a vacuum-driven chuck may be employed for disk and clamp handling purposes, all of which are suitable for implementation and use in a read-write device configured for use in an archival data storage system library such as in a cleanroom storage system.

A base member of a spindle motor includes an upper surface and a lower surface, in which the base member is a casting, the upper surface includes a pin portion extending upward, the lower surface includes a first lower surface and a second lower surface positioned higher than the first lower surface, and the first lower surface and the second lower surface are adjacent to each other with a stepped portion interposed between the first lower surface and the second lower surface, the stepped portion increasing in height from the first lower surface to the second lower surface. The stepped portion has a uniform height difference, and when a tangential line is drawn to the stepped portion in a cross section passing through a central axis of the pin portion and extending perpendicular to the stepped portion in plan view, the tangential line extends through between a lower edge point of an outer periphery of the pin portion on a side of the second lower surface and a lower edge point of the outer periphery of the pin portion on a side of the first lower surface.

An apparatus and a method of fabricating an apparatus for piercing an object, the apparatus comprises: a substrate; one or more needles; one or more anchors and one or more piezoelectric actuators. The method comprises the steps of deposit sacrificial layer over the substrate; deposit conducting layer over the sacrificial layer; deposit piezoelectric layer over the conducting layer; etch a geometry of the one or more piezoelectric actuators using a first mask created by lithography process; deposit the one or more needle and one or more anchors using a second mask created by lithography process and a lift-off process; etch the sacrificial layer under the needle and the one or more piezoelectric actuators, wherein the anchors are configured to connect the substrate to the piezoelectric actuators and the one or more piezoelectric actuators are configured to expand, contract or bend, and form holding arms that are configured to move the one or more needles.

A base plate includes a base body including a bottom plate and a pivot post, and an electrodeposition coating film. The bottom plate extends perpendicular to a first axis, a rotation axis of the disk, and a second axis, a swing axis of a head; and, when viewed from an axial direction, has a rectangular shape with a first direction as a short side direction and a second direction as a long side direction. The pivot post protrudes upward from an upper surface of the bottom plate at a position overlapping the second axis. The bottom plate has a thin bottom arranged in a radially outward direction orthogonal to the second axis of the pivot post and including at least one of a lower recess recessed upward from a lower surface of the bottom plate and an upper recess recessed downward from the upper surface of the bottom plate.

A base plate is a portion of a housing of a disk drive apparatus, including a base body being a casting product, and an electrodeposition coating film covering at least a portion of a surface of the base body. The base body includes a bottom plate rectangular as viewed from an axial direction, a pivot post, and a protrusion. The bottom plate extends perpendicular to a rotation axis of a disk that extends vertically and a swing axis of a head that is disposed in a different position from the rotation axis and that extends vertically. The head reads or writes information from or to the disk. The pivot post protrudes upward from an upper surface of the bottom plate along the swing axis. The protrusion is provided protruding radially outward from a peripheral surface of the pivot post and protruding to the upper surface of the bottom plate.